Medical Licensing (MD/DO) · Independent exam preparation
ABOS Surgery of the Hand Subspecialty Examination: Free Preparation Guide Study Guide
Practise fracture alignment, nerve localization, tendon protection, vascular assessment, and reconstruction choices for the initial ABOS Surgery of the Hand examination.
By CertMedbry · Updated 15 October 2026
Practise deciding whether a fracture is acceptably aligned, localizing sensory and motor deficits, protecting tendon repairs, recognizing threatened perfusion, and choosing coverage that can heal. Each concept links an anatomical or biological mechanism to a clinical decision, followed by a short case and a common error. This selective 60-concept guide addresses all seven domains of the initial ABOS Surgery of the Hand Subspecialty Examination. The official ABOS blueprint defines the full scope, including subjects beyond these selected lessons. Use the guide to develop clinical discrimination, then use the complete outline to identify remaining study needs.
Try 20 free practice questionsWhat is the exam format?
Check the question types, timing and outline before planning your revision.
Which examination and credential does this guide address?
This guide addresses the initial ABOS Surgery of the Hand Subspecialty Examination and the ABOS-issued Subspecialty Certificate in Surgery of the Hand. It is a physician subspecialty credential, distinct from medical licensure, ABOS Part I, and general orthopaedic certification. Its clinical scope includes upper-extremity structures directly affecting hand and wrist form and function.
Surgery of the Hand | ABOS · Rules and Procedures for the Surgery of the Hand Subspecialty Certification and Recertification Examinations
How many questions are on the initial examination?
ABOS specifies 175 multiple-choice questions for initial subspecialty certification. ABOS does not identify a separate scored-versus-pretest count in its examination description or Rules and Procedures.
Surgery of the Hand | ABOS · Rules and Procedures for the Surgery of the Hand Subspecialty Certification and Recertification Examinations
What duration and break arrangements are published?
The ABOS examination page describes a four-hour examination and 15 total minutes of break time usable between sections. It states that completing the tutorial at home can provide extra break time and that unscheduled breaks reduce available examination time. These statements do not establish a separate total appointment duration or a section-by-section timing schedule.
How is the examination delivered, and is it adaptive?
ABOS describes computer administration at Pearson VUE test centers nationwide. ABOS does not describe the examination as computer-adaptive in its examination page or Rules and Procedures.
Surgery of the Hand | ABOS · Rules and Procedures for the Surgery of the Hand Subspecialty Certification and Recertification Examinations
Which item styles does ABOS describe?
ABOS describes multiple-choice questions without specifying additional item styles or their proportions. This guide uses four-option single-best-answer questions as independent learning exercises.
Surgery of the Hand | ABOS · Rules and Procedures for the Surgery of the Hand Subspecialty Certification and Recertification Examinations
Which blueprint and effective dates apply?
The currently linked dedicated ABOS subspecialty blueprint has a 2025 filename and no printed effective date. The Rules and Procedures supersede earlier rules as of March 16, 2026. That date applies to the rules, not to a stated blueprint effective date.
Surgery of the Hand | ABOS · ABOS Surgery of the Hand Subspecialty Examination Blueprint · Rules and Procedures for the Surgery of the Hand Subspecialty Certification and Recertification Examinations
What are the official domain weights?
The dedicated blueprint assigns Bone 20%, Joint/ligament 20%, Muscle/tendon 13%, Nerve 15%, Circulatory system 7%, Skin/fascia/nails 12%, and General principles/other 13%. This selective guide contains 12, 11, 9, 9, 4, 7, and 8 concepts respectively. Question and flashcard sets approximate the weights through whole-item rounding; lesson counts do not define the examination's scope.
How does initial certification differ from recertification and other board pathways?
The March 16, 2026 handbook identifies 175 questions for initial certification and 150 for hand subspecialty recertification. This guide selects the initial ABOS pathway; it does not combine recertification, combined continuing-certification, or practice-profiled examinations. The handbook lists ABOS, ABS, and ABPS as examination developers and administrators, while ABOS issues the credential addressed here.
Can candidates take the examination before completing primary ABOS certification?
The current rules allow candidates who have passed ABOS Part I to register for the subspecialty examination after completing, or while completing in the examination year, the specified ACGME-accredited fellowship with fellowship-director attestation. Passing the examination does not itself award the certificate. Primary ABOS certification and the required application, case list, credentials review, and applicable deadlines remain necessary. The rules also specify licensure requirements involving the United States, a United States jurisdiction, a Canadian province, or qualifying federal practice.
Independently authored preparation for physician subspecialty certification through ABOS. The original questions are educational single-best-answer drills; they are not official examination questions or a prediction of passing.
Outline used: Dedicated Surgery of the Hand Subspecialty Examination blueprint currently linked by ABOS, verified 2026-10-09; filename identifies 2025, but the document states no effective date. Rules and Procedures supersede prior rules as of March 16, 2026. The workbook label maps to this initial subspecialty examination; the assigned slug is preserved.
60 key concepts: understand, apply and avoid the traps
Work through the questions by exam domain. Explain the answer in your own words, try the example, then check the common pitfall.
Bone20%
1.How is rotational malalignment detected after a finger fracture?
Rotation is a clinical alignment problem that can remain inconspicuous when the fingers are extended. Examine the cascade with the metacarpophalangeal joints flexed, watching for overlap and comparing nail orientation. Normally, the fingertips converge toward the scaphoid region. A finger that crosses its neighbor during flexion suggests malrotation even when radiographs appear satisfactory. Correct rotation before accepting fixation because a small rotational error can substantially disrupt grasp and coordinated finger movement.
Apply it
After reduction of a ring-finger fracture, the straight finger looks aligned. During a gentle composite fist, it crosses the small finger. Reassess rotational reduction before accepting the radiographs or finalizing fixation.
Common pitfall: A satisfactory anteroposterior image does not exclude malrotation. Assessing only the extended fingers can miss the deformity that becomes functionally important during grasp.
2.Why does articular congruity matter in a phalangeal fracture?
An articular fracture changes the surface over which the opposing joint moves. Residual depression, separation, or angulation can produce uneven contact and digital deformity, increasing the risk of painful posttraumatic degeneration. AO emphasizes anatomical reduction for these injuries. The decision therefore concerns both joint-surface restoration and stable alignment, rather than merely obtaining union. Assess the articular reduction directly or with appropriate imaging before deciding that fixation has achieved its purpose.
Apply it
A unicondylar proximal-phalanx fracture has recovered overall length, but imaging still shows a depressed articular fragment and finger angulation. Revise the reduction rather than accepting length restoration as an adequate endpoint.
Common pitfall: Union alone does not establish a successful articular reconstruction. A healed fracture can still leave an incongruent joint and a mechanically disadvantageous finger position.
3.What mechanical limitations distinguish K-wire fixation?
K-wires can stabilize suitable phalangeal fragments while limiting implant bulk, but they do not inherently create interfragmentary compression. AO describes using at least two appropriately directed wires for rotational control and protecting fixation with a splint. Fragment size, wire purchase, articular reduction, and stability determine suitability. Tiny fragile fragments may require another fixation strategy because passing a wire through them may fail to secure the fragment or may damage it.
Apply it
An adult has a reducible articular phalangeal fracture with fragments large enough for wire purchase. Plan wire configuration and protective splinting explicitly; do not assume that crossing the fracture automatically compresses its joint-surface gap.
Common pitfall: Treating K-wires as compression screws overestimates their mechanics. A construct can resist some displacement while still requiring protection and careful assessment of residual articular separation.
4.When does distal radius alignment support fixation in a younger adult?
The AAOS/ASSH guideline provides moderate support for operative treatment in non-geriatric adults, commonly younger than 65 in the underlying studies, when postreduction shortening exceeds 3 mm, dorsal tilt exceeds 10 degrees, or intra-articular displacement or step-off exceeds 2 mm. These are postreduction criteria associated with improved radiographic and patient-reported outcomes in that population. Apply them with functional demand, comorbidity, and patient goals rather than treating an initial displaced image as the final decision.
Apply it
A healthy 43-year-old remains shortened by 4 mm after distal radius reduction. Explain that this exceeds a guideline-supported postreduction threshold for discussing fixation, while incorporating work demands and the patient's treatment preferences.
Common pitfall: Using prereduction measurements misapplies the recommendation. The evidence concerns residual alignment after reduction and should not be transferred automatically to every age group.
Management of Distal Radius Fractures Evidence-Based Clinical Practice Guideline
5.How should distal radius evidence be interpreted in older adults?
For geriatric patients, commonly defined as 65 years or older in the studies, strong evidence indicates that surgery does not improve long-term patient-reported outcomes compared with nonoperative treatment. This does not mean that alignment, early recovery, or individual goals are irrelevant. Age functions as a study-based proxy for demand. Separate an improved radiograph or earlier recovery from a demonstrated long-term patient-reported advantage when counseling an active older person.
Apply it
A 76-year-old with a displaced distal radius fracture asks whether surgery guarantees better long-term hand function. Explain the lack of an average long-term patient-reported advantage, then discuss personal activity goals and recovery priorities.
Common pitfall: Neither mandatory surgery nor automatic exclusion from surgery follows from chronological age. The recommendation describes comparative long-term outcomes, not an absolute treatment prohibition.
Management of Distal Radius Fractures Evidence-Based Clinical Practice Guideline
6.Which outcome advantage is established for volar locking plates?
For complete articular or unstable distal radius fractures, the AAOS/ASSH guideline finds no significant overall radiographic or patient-reported outcome difference among fixation techniques, while volar locking plates provide earlier functional recovery in the short term, approximately three months. Technique selection should therefore distinguish the timing of recovery from eventual outcome. Fracture characteristics and patient priorities still matter, but an early functional advantage should not be represented as universal long-term superiority.
Apply it
Two feasible fixation methods are being discussed with a patient whose immediate priority is resuming essential daily activities. Describe the early recovery advantage associated with volar plating without promising a better eventual patient-reported result.
Common pitfall: An earlier recovery curve does not establish a higher final outcome. Avoid converting a time-specific benefit into a claim that one implant is always superior.
Management of Distal Radius Fractures Evidence-Based Clinical Practice Guideline
7.How should a suspected occult scaphoid fracture be protected and investigated?
A fall onto an outstretched hand followed by focal anatomical-snuffbox tenderness can represent a scaphoid fracture despite normal initial radiographs. Maintain protection with a splint or cast while arranging further assessment. MRI can identify an occult fracture before radiographs become positive and depicts surrounding soft tissues. CT can demonstrate a fracture and clarify displacement and fragment geometry. Choose imaging to answer the unresolved question: early fracture detection and soft-tissue assessment differ from detailed planning around an established fracture's bony alignment.
Apply it
A snowboarder has persistent snuffbox tenderness with negative radiographs. Protect the wrist and consider MRI for early occult-fracture detection. For a visible waist fracture with uncertain displacement, consider CT to define fragment geometry.
Common pitfall: A negative initial radiograph does not exclude fracture. Neither advanced modality is universally best; select it according to the diagnostic uncertainty.
8.Why is a Bennett fracture unstable despite a small retained articular fragment?
A Bennett fracture is an intra-articular fracture at the first metacarpal base. The volar-ulnar fragment remains attached through the anterior oblique ligament, while the larger metacarpal shaft fragment displaces proximally, dorsally, and radially under deforming forces including the abductor pollicis longus. The retained fragment therefore does not establish a stable thumb CMC joint. Assess articular reduction and whether the shaft remains reduced. A Rolando fracture differs by comminution of the articular base, often with a V-shaped pattern, which can make reconstruction more difficult.
Apply it
A thumb-base fracture has a small volar-ulnar fragment near its original position but a proximally displaced shaft. Recognize the Bennett pattern and assess maintenance of CMC reduction rather than judging stability from the small fragment alone.
Common pitfall: A small fracture fragment can accompany substantial joint instability. Bennett and comminuted Rolando patterns should not be treated as interchangeable extra-articular fractures.
9.Why are proximal scaphoid fractures vulnerable to osteonecrosis?
Much of the scaphoid's blood supply enters distally and travels toward the proximal portion. A fracture can interrupt this route, leaving the proximal fragment with impaired perfusion. Proximal location and displacement therefore raise concern about healing and osteonecrosis. This vascular pattern explains why similar-looking fractures at different locations may have different prognoses. Evaluate fragment viability as well as alignment; successful mechanical fixation cannot by itself guarantee survival of poorly perfused bone.
Apply it
A patient compares a proximal-pole scaphoid fracture with a friend's distal-pole injury. Explain that the proximal fragment depends on a more vulnerable blood-supply route, which changes healing expectations and the discussion of treatment.
Common pitfall: Applying the usual assumption of proximal-to-distal bone perfusion reverses the relevant scaphoid anatomy. Fracture location has biological significance beyond its descriptive label.
10.How do biology, collapse, and arthritis shape scaphoid nonunion treatment?
Scaphoid nonunion requires assessment of viability, mechanical support, and joint condition. A structural graft can restore support when shape has collapsed; a vascularized graft brings its own blood supply when perfusion is a concern. Established arthritis can limit the benefit of restoring the original bone. Union also needs a viable biological environment: smoking can delay or prevent healing, and intact fixation does not establish union. Match reconstruction to the deficit and address modifiable healing risks while protecting the fracture until healing is documented.
Apply it
A smoker with a fixed scaphoid nonunion has persistent pain and collapse. Assess union, fragment viability, structural support, and arthritis rather than reassuring the patient solely because the screw is intact.
Common pitfall: Graft names are not interchangeable solutions. Improved blood supply does not necessarily correct collapse, and stable hardware does not prove biological union or reverse established arthritis.
11.How does protective positioning reduce contracture during hand-fracture immobilization?
The protective position for suitable metacarpal and phalangeal injuries places the wrist in slight extension, MCP joints in approximately 80–90 degrees of flexion, and interphalangeal joints in extension. MCP flexion preserves collateral-ligament length, while IP extension helps prevent flexion contractures. The fracture pattern and fixation still determine which joints need immobilization and when movement is safe. Protection should maintain reduction without unnecessarily immobilizing uninvolved joints or continuing restriction after adequate stability permits prescribed motion.
Apply it
A patient with a stabilized metacarpal fracture needs a protective splint. Check MCP flexion, IP positioning, fracture alignment, and which joints can safely remain mobile; set a review point for progressing motion.
Common pitfall: A protective position is not permission to immobilize every injury identically. Tendon injuries, particular fracture-dislocations, and fixation characteristics can require a different plan.
12.How is an open Seymour fracture distinguished from a closed pediatric mallet injury?
A child's drooping fingertip with nailbed disruption and a displaced distal-phalanx physeal fracture suggests an open Seymour injury. Nailbed tissue may be trapped in the fracture and block reduction. Begin prompt open-fracture treatment: irrigation and debridement, systemic antibiotics, and tetanus assessment. Remove interposed tissue, reduce the fracture, manage and repair the nailbed, and stabilize the fracture when necessary. The BSSH fracture reference expressly recommends systemic antibiotics for open fractures. Closed-mallet extension splinting alone does not address contamination, tissue interposition, or the open growth-plate injury.
Apply it
A child has a flexed fingertip after a door crush, nail-fold bleeding, and a displaced distal-phalanx physeal fracture. Initiate antibiotics and wound treatment promptly, assess tetanus protection, remove trapped tissue, and restore fracture and nailbed anatomy with stabilization as needed.
Common pitfall: Treating only the deformity misses infection prevention. Delaying irrigation, debridement, and systemic antibiotics while planning reduction leaves the open fracture incompletely treated.
Mallet Finger | AAOS OrthoInfo · Chapter-25-Hand-Fractures-and-Dislocations.pdf
Joint/ligament20%
13.What does a lateral PIP V-sign indicate after reduction?
A reduced proximal interphalangeal joint should have congruent articular surfaces and appropriate axial alignment. On a lateral radiograph, a V-shaped joint-space divergence indicates residual subluxation rather than a satisfactory reduction. AO also emphasizes alignment of the dorsal cortical profiles. A clinically straighter finger can still have an incongruent joint. Reassess reduction and stability when these signs persist instead of using improved external appearance as the sole endpoint of treatment.
Apply it
After a PIP dislocation is reduced, the finger looks straight, but the lateral image shows dorsal joint-space divergence. Treat this as residual subluxation and reassess congruity before choosing routine protective aftercare. Also assess the central slip using the examination described in the extensor tendon lesson.
Common pitfall: A successful reduction maneuver is not proof of a successfully reduced joint. Confirm the result on appropriate views and assess whether that reduction is maintained.
Dislocation of the Proximal Interphalangeal Joint | AO Surgery Reference · Patient assessment
14.Why can a PIP dislocation remain irreducible?
Soft tissue can become trapped within a dislocated PIP joint and prevent congruent reduction. AO describes interposition of the extensor apparatus, including a lateral-band and central-slip relationship that can trap the condyle. Persistent joint widening after attempted reduction raises this concern. When a mechanical block prevents reduction, repeated force does not address the cause. Open reduction and appropriate repair may be required to remove the interposed tissue and restore the joint relationship.
Apply it
A rotational PIP dislocation remains widened on imaging despite a careful reduction attempt. Suspect interposed soft tissue and plan management of the mechanical block rather than repeatedly increasing traction on the finger.
Common pitfall: Attributing every failed reduction to inadequate force can worsen injury. Persistent incongruity may reflect an anatomical obstruction that requires exposure rather than stronger manipulation.
15.How does thumb MCP stress testing distinguish ligament injury severity?
The thumb ulnar collateral ligament supports MCP stability during pinch. Compare stress testing with the uninjured side and assess the endpoint, accounting for pain and any associated fracture. AO describes testing in approximately 30 degrees of flexion to reduce the stabilizing influence of the volar plate. More than 15 degrees of side-to-side difference with a soft endpoint supports complete rupture; a firm endpoint with lesser difference supports a potentially nonoperative injury.
Apply it
Following forced thumb abduction, a patient has MCP pain. After appropriate assessment and pain control, comparison testing shows marked additional opening with no firm endpoint. Interpret the findings as evidence of complete ligament disruption.
Common pitfall: Tenderness alone cannot establish ligament continuity. Testing only in full extension may allow the volar plate to conceal instability relevant to the collateral ligament.
Proximal Phalanx, Base and Shaft, Skier’s Thumb | AO Surgery Reference · Sprained Thumb | AAOS OrthoInfo
16.Why does a Stener lesion interfere with UCL healing?
In a Stener lesion, the torn thumb ulnar collateral ligament stump is displaced superficial or dorsal to the adductor aponeurosis. That intervening tissue prevents the ligament from returning to its attachment and healing in the normal relationship. The critical feature is displacement across an anatomical barrier, not merely a painful sprain. Recognizing this lesion changes the treatment discussion because immobilization cannot reliably restore contact between structures separated by the interposed aponeurosis.
Apply it
A complete thumb UCL tear is shown with the ligament stump lying superficial to the adductor aponeurosis. Explain why casting alone does not remove the barrier to anatomical healing and discuss operative restoration.
Common pitfall: A Stener lesion is not simply a severe grade of pain or swelling. Its defining feature is the ligament's displaced relationship to the adductor aponeurosis.
Proximal Phalanx, Base and Shaft, Skier’s Thumb | AO Surgery Reference
17.How are thumb CMC arthritis symptoms localized and initially managed?
Thumb CMC arthritis commonly causes thumb-base pain during pinch, gripping, or turning tasks. Local tenderness and familiar pain or crepitus during axial loading with rotation support the joint as the pain source; correlate these findings with radiographs. Initial care can include activity modification, a supportive thumb-base splint, suitable analgesic or anti-inflammatory treatment, and guided exercises. These measures reduce painful loading without restoring cartilage. Persistent pain and functional limitations despite reasonable nonsurgical care guide discussion of surgery.
Apply it
A patient has thumb-base tenderness and familiar pain with CMC loading while opening jars. Begin joint-directed support and task modification, then reassess valued activities rather than selecting surgery from radiographs alone.
Common pitfall: Radial wrist tendon pain and MCP instability can also impair thumb use. Radiographic degeneration alone neither identifies the symptomatic structure nor mandates reconstruction.
18.How do dynamic and static scapholunate instability differ, and which findings guide treatment?
The scapholunate interosseous ligament couples scaphoid and lunate motion. Injury can cause pain, weakness, and mechanical clicking despite normal resting radiographs. Dynamic instability produces abnormal alignment under loading or during movement; static instability produces malalignment visible on resting films. When clinical suspicion persists despite normal resting images, grip or clenched-pencil stress views, compared with the opposite wrist, can reveal abnormal scapholunate widening. Secondary ligament restraints help explain why even a complete scapholunate tear may initially lack static abnormalities. Treatment depends on specific structural findings: a repairable ligament with reducible alignment and preserved cartilage favors direct repair; an irreparable ligament with reducible alignment and preserved cartilage may require reconstruction. Fixed deformity or established arthritis shifts treatment toward salvage rather than isolated ligament restoration.
Apply it
After a fall, a patient has dorsal scapholunate tenderness and painful clicking but normal resting films. Obtain appropriate stress imaging rather than excluding instability. If operative assessment shows viable ligament tissue and correctable alignment, repair may be feasible. Chronic, deficient tissue may require reconstruction if alignment remains reducible. Arthritic collapse may instead require a salvage procedure, with the remaining cartilage determining which articulations can be retained.
Common pitfall: A widened interval alone is not diagnostic because positioning and normal anatomical variation affect measurements. Conversely, normal resting and stress films do not exclude every important ligament injury. MRI characterizes anatomy, while arthroscopy can assess ligament competence, reducibility, and cartilage directly. Neither chronicity alone nor temporary pain relief establishes whether repair, reconstruction, or salvage is appropriate.
ABOS Surgery of the Hand Subspecialty Examination Blueprint · servlet.FileDownload
19.How does posttraumatic arthritis differ from primary degeneration?
Posttraumatic arthritis follows an injury that damages cartilage directly or alters the joint's mechanical environment. An intra-articular fracture or dislocation can initiate degeneration even after appropriate treatment; residual incongruity or malalignment can add abnormal loading. Primary osteoarthritis does not require that preceding injury. A history of a specific injured joint becoming progressively painful and stiff is therefore diagnostically useful. Relating present degeneration to prior trauma helps explain prognosis without assuming that treatment failure caused every later arthritic change.
Apply it
Years after a PIP fracture-dislocation, a patient develops focal stiffness, pain, and joint-space loss in that finger. Connect the degeneration to the original articular injury while reviewing current alignment and functional demands.
Common pitfall: Later arthritis does not prove that the original injury was managed incorrectly. Cartilage injury at the time of trauma can produce degeneration despite a satisfactory reduction.
20.Why does bilateral small-joint synovitis suggest inflammatory disease?
Rheumatoid arthritis is an autoimmune process that inflames the synovial lining and can progressively damage cartilage. Similar small joints on both sides of the body are often involved. Bilateral swollen joints with stiffness therefore call for evaluation of systemic inflammatory disease rather than an explanation based solely on local wear. No single symptom is diagnostic: morning stiffness also occurs in hand arthritis generally. The discriminating pattern combines distribution, synovitis, clinical course, and associated findings.
Apply it
A patient has persistent swelling across corresponding MCP joints in both hands without a preceding injury. Evaluate an inflammatory process and its systemic implications rather than attributing the entire pattern to repetitive gripping.
Common pitfall: Morning stiffness by itself does not establish rheumatoid arthritis. Use the distribution and evidence of synovial inflammation, and avoid treating a pattern as a definitive laboratory diagnosis.
21.Why is symptom relief insufficient as the sole treatment goal in rheumatoid arthritis?
Analgesic and anti-inflammatory measures can improve pain, but rheumatoid arthritis also requires attention to its autoimmune cause and progressive joint injury. AAOS describes specialized medications prescribed and monitored by clinicians with rheumatologic expertise. A local injection, splint, or operation may address a particular symptomatic problem without controlling disease throughout the patient. Separate local functional reconstruction from systemic disease management, and assess both when persistent synovitis threatens cartilage and hand function.
Apply it
A patient with established rheumatoid arthritis reports less pain after a wrist injection but continues to have swollen MCP joints bilaterally. Reassess systemic disease management rather than interpreting local relief as control of the underlying illness.
Common pitfall: Reduced pain after an intervention does not demonstrate suppression of autoimmune activity. Local improvement and systemic disease control must be evaluated as different treatment outcomes.
22.How do fusion and joint replacement trade pain relief against motion?
Arthrodesis removes motion at the treated joint in exchange for a stable fused relationship and potential pain relief. Joint replacement aims to relieve pain while maintaining useful motion, although suitability and durability depend on the joint and patient. Before choosing between them, identify how much the patient relies on that particular motion for valued tasks. The central counseling distinction is explicit: a successful fusion can relieve symptoms while permanently eliminating movement at the fused articulation.
Apply it
A patient considering surgery for a destroyed finger joint asks whether fusion will restore normal bending after healing. Explain the permanent loss of motion at that joint and compare its functional consequences with motion-preserving alternatives.
Common pitfall: Presenting fusion as a temporary immobilization misstates the procedure. Successful union is the intended endpoint, so therapy cannot later restore motion through the fused joint.
23.How can protective splinting contribute to stiffness or weakness?
Splints can unload painful joints and protect injured structures, but excessive restriction also reduces useful movement and can contribute to muscle atrophy. AAOS recommends keeping arthritis splints sufficiently limited to permit function and avoiding unnecessarily prolonged wear. The treatment question is therefore which motion needs protection and which joints can move safely. Protection should have an anatomical purpose and a review point rather than becoming indefinite immobilization of an otherwise usable hand.
Apply it
A patient wears a bulky arthritis splint continuously and reports increasing difficulty using uninvolved fingers. Reassess splint extent and wear schedule, preserving support for the painful joint while allowing safe activity elsewhere in the hand.
Common pitfall: More immobilization is not always more therapeutic. The correct boundary depends on the structure being protected; advice for arthritis cannot automatically replace a fracture or tendon-repair protocol.
Muscle/tendon13%
24.How does the Elson examination identify an early central-slip injury?
After a PIP injury, flex the PIP approximately 90 degrees over a table edge and ask the patient to extend it against resistance while assessing the DIP. Weak resisted PIP extension accompanied by a rigidly extending or hyperextending DIP supports central-slip disruption. Ordinary active PIP extension can remain possible because the intrinsic muscles and lateral bands still transmit extension force. Central-slip failure can subsequently allow palmar migration of the lateral bands, producing PIP flexion and DIP hyperextension: the boutonnière pattern.
Apply it
A patient can partly straighten the PIP after reduction, but central-slip injury remains suspected. Perform the Elson examination; weak PIP extension with rigid DIP extension warrants management of the extensor injury despite a congruent radiograph.
Common pitfall: Preserved ordinary active extension does not establish central-slip continuity. Assess the tendon mechanism specifically before a fixed deformity develops.
Patient assessment · Dislocation of the Proximal Interphalangeal Joint | AO Surgery Reference
25.How do flexor insertions help localize a tendon injury?
Flexor digitorum superficialis inserts on the middle phalanx, whereas flexor digitorum profundus continues to the distal phalanx. Their different insertions explain why isolated loss of active DIP flexion raises concern about FDP continuity. The profundus passes through the split superficialis tendon near the PIP joint. Injury localization should connect the wound level with the missing active movement and preserved passive motion, while also assessing associated nerves and other damaged structures.
Apply it
Following a palmar finger laceration, a patient can flex the PIP joint but cannot actively flex the DIP joint despite preserved passive movement. Focus assessment on the profundus mechanism and the wound's anatomical level.
Common pitfall: Visible finger flexion does not prove that both flexor tendons are intact. Preserved motion at one joint can conceal loss of a tendon acting on another.
26.Why must pulley preservation be balanced against repair gliding?
Flexor pulleys keep tendons close to the phalanges and support efficient conversion of tendon excursion into finger flexion. Excessive pulley loss can permit bowstringing, but an overly constricted sheath can obstruct a repaired tendon. AO describes selective A2 or A4 venting when the remaining pulleys are intact and part of A2 is preserved. These are source-specific anatomical conditions, rather than an exhaustive rule for every repair. The objectives are smooth glide and sufficient restraint.
Apply it
A flexor repair catches beneath A4 during intraoperative movement. Confirm the integrity of the other pulleys and preservation of A2, then assess whether selective A4 venting restores smooth glide without sacrificing necessary support.
Common pitfall: Neither complete pulley sacrifice nor absolute prohibition of venting reflects the principle. The amount and location of release must preserve the functioning pulley system.
27.How does controlled motion support flexor tendon healing?
A repaired flexor tendon needs protection from excessive load while maintaining enough excursion to limit adhesions. Intrinsic tendon healing contributes repair tissue, whereas cellular invasion from surrounding tissues can favor fibrosis and tethering. Controlled rehabilitation seeks to preserve glide without disrupting the repair. The permitted motion depends on repair characteristics, injury level, and associated injuries. Early controlled movement is a prescribed mechanical environment, not permission for unrestricted gripping because the skin wound has closed.
Apply it
A patient with a healing flexor repair wants to start forceful squeezing because the incision looks healed. Explain why the therapist's protected movement program promotes glide while heavy loading can exceed the repair's current tolerance.
Common pitfall: Complete rest and unrestricted exercise are both oversimplifications. Skin healing does not establish tendon strength, and unnecessary immobilization can trade protection for disabling adhesions.
28.When is continuous DIP extension appropriate for mallet finger?
A closed mallet injury disrupts the terminal extensor mechanism, leaving the DIP joint unable to extend actively. When the joint remains aligned and the injury is suitable for nonsurgical treatment, continuous extension splinting allows healing while keeping tendon ends appropriately positioned. The DIP must remain straight during hygiene and splint changes. AAOS describes full-time splinting for six to eight weeks. Other joints should remain mobile when they do not require protection.
Apply it
A patient has a closed mallet finger, a congruent DIP joint, and no displaced fracture requiring another approach. Teach continuous DIP extension, including how to support the fingertip while changing the splint and inspecting the skin.
Common pitfall: Removing the splint briefly is not harmless if the DIP droops. Flexion can disrupt healing, whereas immobilizing uninvolved joints unnecessarily adds avoidable stiffness.
29.Which findings raise concern for acute compartment syndrome?
Acute compartment syndrome develops when pressure within a closed fascial compartment compromises tissue perfusion. Escalating pain out of proportion to the injury, pain with passive stretch, and a tense swollen compartment are concerning findings. A palpable pulse does not exclude impaired microcirculation. Serial assessment matters because the syndrome evolves. Once the diagnosis is established, urgent decompression is required; waiting for paralysis or pulse loss risks allowing preventable muscle and nerve injury to become irreversible.
Apply it
After a forearm crush injury, pain rises despite treatment, passive finger extension is very painful, and the forearm is tense. A radial pulse remains present. Recognize the threatened compartment rather than using the pulse as reassurance.
Common pitfall: Late neurological or vascular findings are poor prerequisites for action. Distal arterial pulsation can persist while pressure already compromises perfusion within the compartment.
Compartment Syndrome | AAOS OrthoInfo · Management of Acute Compartment Syndrome Evidence-Based Clinical Practice Guideline
30.How should pressure monitoring differ from treatment of diagnosed compartment syndrome?
Calculate ΔP = diastolic blood pressure − intracompartmental pressure. The 2025 AAOS adult-trauma guideline supports repeated or continuous measurements, with ΔP greater than 30 mmHg assisting in ruling out acute compartment syndrome. A single value cannot replace clinical assessment. For example, 70 − 45 = 25 mmHg does not satisfy that rule-out criterion, but does not independently establish the diagnosis. An unreliable examination warrants repeated or continuous assessment. Established acute compartment syndrome requires prompt, complete decompression of the involved compartments.
Apply it
An obtunded trauma patient has a diastolic pressure of 70 mmHg and compartment pressure of 45 mmHg. Record ΔP as 25 mmHg and continue urgent diagnostic assessment. Do not label the limb safe or delay decompression if the syndrome is established.
Common pitfall: Reversing the subtraction or using intracompartmental pressure alone misapplies the criterion. Diagnostic monitoring should not postpone treatment of established syndrome; late irreversible injury requires separate assessment.
Management of Acute Compartment Syndrome Evidence-Based Clinical Practice Guideline · Compartment Syndrome | AAOS OrthoInfo
31.Which features distinguish de Quervain syndrome from joint pain?
De Quervain syndrome causes pain over the tendon tunnel on the thumb side of the wrist, commonly aggravated by lifting the thumb or similar tendon-loading tasks. Local tenderness and sometimes swelling help localize the problem. Protective splinting should include both wrist and thumb because the symptomatic tendons move across that region. Distinguish this pattern from CMC pain reproduced by joint loading. Symptom aggravation during activity does not by itself establish that work caused the disorder.
Apply it
A parent develops radial wrist pain while lifting an infant, with tenderness over the thumb-side tendon tunnel. Choose a wrist-and-thumb support when splinting is indicated and distinguish the pain site from the thumb CMC joint.
Common pitfall: A wrist-only splint may leave relevant thumb movement unrestrained. Do not infer occupational causation merely because hand use worsens symptoms during work or caregiving.
De Quervain’s Syndrome | British Society for Surgery of the Hand
32.What mechanism produces a trigger digit's catching and locking?
A trigger digit develops when a flexor tendon catches as it passes through a narrowed tendon-tunnel entrance. The resulting mechanical mismatch produces painful clicking, intermittent locking in flexion, and tenderness on the palmar side near the point of catching. Symptoms may be worse on waking, and the opposite hand may be needed to straighten the digit. This dynamic catching differs from a fixed fascial contracture, although a longstanding trigger digit can also become stiff.
Apply it
A finger locks during flexion and releases with a painful click when the other hand straightens it. Palmar tenderness accompanies the catching. Localize the problem to flexor tendon passage rather than assuming that a joint surface is locking.
Common pitfall: A bent finger is not sufficient to diagnose Dupuytren disease. Reproducible tendon catching and a palpable fascial cord describe different mechanisms that require different management.
Trigger Finger/Thumb | British Society for Surgery of the Hand
Nerve15%
33.How is CTS-6 scored and interpreted in a clinical carpal tunnel assessment?
CTS-6 adds weighted findings: predominantly median-territory numbness, 3.5; nocturnal numbness, 4; thenar weakness or atrophy, 5; Phalen testing reproducing median-distribution numbness, 5; inability to distinguish two points 5 mm or less apart in median-innervated digits, 4.5; and Tinel testing at the carpal tunnel producing distal median-distribution paresthesias, 4. Thenar weakness means grade 4 or less. The [AAOS appropriate-use document](https://www.aaos.org/globalassets/quality-and-practice-resources/carpal-tunnel/cts-auc_hardcopy_1.4.17.pdf) describes scores below 5 as low probability, 5–11.5 as moderate, and at least 12 as high probability, approximately 80%. This older tool description is distinct from the 2024 guideline's strong recommendation permitting CTS-6 instead of routine ultrasound or electrodiagnostic testing. MRI and upper-limb neurodynamic testing are not recommended for routine CTS diagnosis. Corticosteroid injections do not provide long-term improvement.
Apply it
Median-territory numbness, nocturnal awakening, and positive Phalen testing contribute 3.5 + 4 + 5 = 12.5 points even with normal thenar strength, preserved two-point discrimination, and negative Tinel testing. This supports high diagnostic probability without requiring all six findings.
Common pitfall: The score estimates diagnostic likelihood, not severity or an automatic indication for surgery. Conflicting neurological findings still require targeted evaluation.
Management of Carpal Tunnel Syndrome Evidence-Based Clinical Practice Guideline
34.How does a tendon transfer restore function after persistent motor loss?
A tendon transfer redirects a working muscle's tendon to replace a lost action. Its motor power comes from the functioning donor muscle; it does not require the original paralyzed muscle to recover. Donor selection must preserve useful remaining function. ASSH illustrates expendability with transfer of one of the two index extensors to replace a ruptured thumb extensor, while the remaining index extensor maintains extension. Tendon transfers can also address persistent loss after nerve injury. The attachment needs protection while healing, followed by prescribed therapy. See [ASSH tendon transfer guidance](https://assh.my.site.com/handcare/condition/tendon-transfer-surgery).
Apply it
For persistent motor loss, identify the missing action and document which potential donors still work. Compare the expected gain with the donor function sacrificed before selecting a transfer.
Common pitfall: A tendon transfer does not restore sensation or repair the original nerve. A donor impaired by the same nerve injury cannot supply the intended power.
35.Why does elbow flexion aggravate cubital tunnel symptoms?
The ulnar nerve passes through a vulnerable region behind the medial epicondyle and into the cubital tunnel. Elbow flexion stretches and compresses the nerve and can reduce its blood supply. Symptoms affecting the little finger and ulnar half of the ring finger during prolonged flexion therefore support elbow-level involvement. Mild positional symptoms may improve by avoiding sustained flexion and direct pressure. Intrinsic weakness, impaired fine movement, or wasting indicates more advanced dysfunction that requires assessment beyond positional advice.
Apply it
A patient wakes with little-finger tingling after sleeping with the elbow tightly bent. Explain the flexion-related nerve stress and trial measures that limit prolonged nighttime flexion while avoiding direct compression over the medial elbow. Document strength and muscle bulk.
Common pitfall: Treating every nocturnal hand symptom as carpal tunnel syndrome ignores distribution and posture. Low pain intensity does not establish mild ulnar neuropathy when weakness or wasting is present.
36.Which findings distinguish a brachial plexus lesion from an isolated distal neuropathy?
Following traction trauma, examine shoulder, elbow, wrist, and hand muscles rather than stopping at the symptomatic fingers. A pattern extending beyond one terminal nerve suggests a more proximal lesion. Upper-trunk injury can impair shoulder elevation and elbow flexion; lower-trunk injury can preserve those actions while severely impairing hand function. Root avulsion removes the proximal connection needed for conventional graft reconstruction, unlike a repairable distal rupture. Electrodiagnostic studies and targeted imaging refine localization and recovery assessment. See [AAOS brachial plexus guidance](https://www.orthoinfo.org/diseases--conditions/brachial-plexus-injuries/).
Apply it
After a motorcycle collision, hand weakness accompanies loss of shoulder elevation and elbow flexion. Assess the plexus and associated traumatic injuries instead of attributing the entire deficit to wrist-level compression.
Common pitfall: Ulnar-digit numbness can accompany lower-trunk injury. Sensory territory alone does not distinguish it from an ulnar neuropathy; compare the complete motor pattern.
37.How does cerebral palsy change the assessment of a poorly functioning hand?
Cerebral palsy reflects impaired brain control of movement. Spastic cerebral palsy causes increased tone, while other forms may cause involuntary movement or poor coordination. Assess tone, voluntary task performance, passive joint motion, and contracture before attributing a flexed hand to a tendon rupture or peripheral nerve palsy. Therapy and appropriately selected splints can improve function and address muscle imbalance; tone-directed treatment and treatment of established contracture solve different problems. See [AAOS cerebral palsy guidance](https://www.orthoinfo.org/diseases--conditions/cerebral-palsy/).
Apply it
A child with cerebral palsy has difficulty opening the hand for dressing. Document voluntary opening, passive extension, tone, and the actual dressing task before choosing a functional or care-related treatment goal.
Common pitfall: Improving passive position does not guarantee coordinated voluntary use. The underlying brain disorder is nonprogressive, but functional difficulty and musculoskeletal contracture can change during growth.
38.How should sensation be assessed after a digital laceration?
Map the sensory deficit against the wound and expected digital nerve territory. AO recommends assessing light touch, temperature, two-point discrimination, and Tinel findings while considering associated bone and soft-tissue injury. A focal deficit distal to a sharp laceration raises concern for nerve disruption even when flexor movement is preserved. Sensory testing should characterize what is lost and where, rather than record only a general statement that the finger feels different.
Apply it
A patient can flex a lacerated finger but reports numbness along one side of the fingertip. Compare sensory modalities and two-point discrimination with the opposite side, then relate the deficit to the wound's course.
Common pitfall: Intact tendon movement does not exclude a digital nerve laceration. Sensory and motor structures can be injured independently within the same small traumatic wound.
39.When is a nerve graft preferable to forced direct coaptation?
A nerve repair should bring viable ends into accurate apposition without a gap or excessive tension. AO recommends considering grafting when direct coaptation cannot meet that condition. Stretching the ends together may compromise the repair environment and creates a mechanically unsound reconstruction. Address associated skeletal injuries before finalizing nerve reconstruction because their alignment affects the tissue relationship. The decisive criterion is a tension-free repair, not a universal gap length applied without considering anatomy and tissue quality.
Apply it
After damaged nerve ends are addressed, they cannot meet without substantial traction. Choose a reconstruction that bridges the defect rather than pulling the ends together simply to avoid a graft and an additional donor site.
Common pitfall: Direct repair is not automatically superior because it uses fewer junctions. That advantage does not justify tension, a residual gap, or poor-quality tissue at coaptation.
40.How does regeneration distance shape expectations after nerve repair?
AO describes peripheral nerve regeneration as averaging approximately 1 mm per day. Distance from the repair to the sensory target therefore helps frame the earliest plausible course of recovery, but it is not a promise of complete function on a calculated date. Protective sensation and discriminative sensation are different rehabilitation goals. Counseling should combine the slow biological process with sensory retraining, occupational adaptation, and protection of areas that cannot reliably detect harmful temperature or pressure.
Apply it
A sensory target lies approximately 60 mm beyond a repair. A rough distance-based estimate is about 60 days of axonal travel, but explain that delay, maturation, and variable recovery make this an estimate rather than a completion date.
Common pitfall: Distance divided by growth rate does not predict full functional recovery. It omits biological variability and the later development of useful, accurately interpreted sensation.
41.How do distance and denervation time guide consideration of a nerve transfer?
A proximal lesion leaves regenerating axons a longer journey to the motor target while denervation continues. A distal nerve transfer can connect a functioning donor closer to the target, shortening that journey and supplying a new motor input. AO recommends considering selective transfer within approximately 10–12 months after injury when proximal motor repair has produced no motor reinnervation. This is a source-specific framework, not a universal deadline. Assessment and planning must begin earlier, using target-muscle recovery, lesion level, elapsed time, and donor availability. See also [AAOS nerve-transfer guidance](https://www.orthoinfo.org/diseases--conditions/brachial-plexus-injuries/).
Apply it
Serial examinations after proximal motor repair show no expected muscle recovery. Reassess the predicted travel distance and denervation interval promptly; plan reconstruction early enough to act within an appropriate individualized window.
Common pitfall: Do not wait until 10–12 months to initiate assessment. Sensory improvement does not establish motor reinnervation, and a nerve transfer still requires axonal growth into a receptive muscle.
Circulatory system7%
42.How should expected function influence replantation selection?
Replantation aims to restore useful function, so survival of the detached part is only one outcome. AAOS describes considering whether a replanted part is likely to function at least as well as a prosthetic alternative. A stiff, painful, insensate digit can hinder the rest of the hand, while preserving a functional thumb may provide substantial benefit. Discuss likely recovery, injury characteristics, rehabilitation burden, and the patient's goals when judging whether reattachment offers meaningful value.
Apply it
A patient asks whether technically reconnecting an amputated digit guarantees a better hand. Discuss the expected sensibility, motion, pain, and interaction with remaining fingers, including why thumb preservation may have particular functional importance.
Common pitfall: Technical feasibility and functional benefit are different decisions. A surviving replant can still obstruct useful grasp, so anatomical restoration alone is an incomplete treatment goal.
43.How are primary Raynaud phenomenon and threatening ischemia distinguished?
Raynaud attacks involve excessive digital-vessel narrowing triggered by cold or emotional stress. Pallor and numbness may progress to blue discoloration, followed by redness as flow returns. Primary Raynaud phenomenon has no identified underlying cause; secondary disease accompanies conditions such as systemic sclerosis or lupus and can produce vessel damage. Persistent painful ulcers or gangrene require assessment of severe ischemia and secondary disease. Nailfold capillaroscopy contributes to distinguishing primary from secondary forms. See [NIAMS Raynaud guidance](https://www.niams.nih.gov/health-topics/raynauds-phenomenon).
Apply it
Compare brief, reversible cold-triggered color changes with a patient whose fingertip remains painful and ulcerated between attacks. The latter needs evaluation of tissue perfusion and an underlying disease process.
Common pitfall: A history of cold sensitivity does not establish benign primary disease. Tissue loss changes the assessment even when vasospasm is part of the mechanism.
44.Why is venous drainage as necessary as arterial inflow after replantation?
Living tissue requires oxygenated blood to arrive and deoxygenated blood to leave. A replanted part can fail when arterial inflow is present but venous drainage is inadequate. AAOS describes close postoperative monitoring and, in selected circumstances, leeches to assist removal of congested blood. The physiological decision is whether the complete circulation is functioning. Evidence of incoming blood cannot establish that tissue perfusion is sustainable if blood cannot exit through an adequate drainage pathway.
Apply it
A replanted digit receives arterial blood but develops documented venous congestion. Focus the assessment on outflow and urgent specialist-directed management rather than concluding that an open arterial repair establishes a satisfactory circulation.
Common pitfall: Arterial patency is necessary but insufficient. Repeatedly assessing only inflow can miss the drainage failure that prevents fresh oxygenated blood from circulating effectively through tissue.
45.Which findings prompt investigation of chronic structural vascular disease?
Persistent cold, painful digits and nonhealing fingertip ulcers warrant examination of pulses and objective flow assessment. Doppler studies, digital pressure recordings, and angiographic imaging answer different questions about perfusion and vessel anatomy. An arterial aneurysm can contain thrombus that blocks flow or embolizes to the fingertips. A vascular malformation may instead present with swelling, warmth, pain, bleeding, or enlargement from abnormal vessels, sometimes with arteriovenous connections. These structural problems require anatomical characterization before treatment. See [ASSH vascular disease guidance](https://assh.my.site.com/handcare/condition/vascular-disease).
Apply it
A patient has a persistent fingertip ulcer and a swelling along an arterial course. Assess distal perfusion and the vascular lesion rather than treating recurrent cold sensitivity alone.
Common pitfall: A vascular mass and vasospastic attacks are different mechanisms. Compression, occlusion, aneurysmal embolization, and malformation cannot be distinguished by the complaint of a cold hand alone.
Skin/fascia/nails12%
46.How should an amputated fingertip be preserved during transport?
Protect the detached part from contamination, desiccation, and additional cold injury. AAOS advises gently cleaning it when possible, wrapping it in moistened gauze, sealing it in a watertight bag, and cooling the bag on ice within another container. The tissue should not directly touch ice. Bring the part promptly with the patient for assessment. Appropriate preservation maintains options; it does not determine by itself whether replantation or another reconstruction will be appropriate.
Apply it
A coworker brings a detached fingertip in a cup of ice. Transfer the tissue to moistened gauze inside a sealed watertight bag, cool the bag without direct tissue contact with ice, and expedite assessment.
Common pitfall: Direct contact with ice can cause additional tissue damage. Cooling should preserve the amputated part, and transport arrangements must also maintain attention to the injured patient.
47.How do injury depth and nailbed findings guide fingertip care?
Assess the nail plate, nailbed, distal phalanx, tissue viability, and depth of soft-tissue loss together. Obtain radiographs when fracture is suspected. A subungual hematoma may need pressure relief, whereas a disrupted nailbed may need repair. A clean, limited wound without exposed bone can often heal with protective dressings and follow-up; deeper loss or exposed structures changes coverage requirements. Treatment follows the damaged structures and healing surface rather than the label fingertip amputation or the visible amount of blood.
Apply it
Compare a shallow clean tissue defect without bone exposure with a door-crush injury involving nail disruption and suspected fracture. Protective wound care may suit the first; the second requires nailbed and bony assessment before selecting treatment.
Common pitfall: Trephination does not repair a disrupted nailbed. Small surface dimensions can conceal a deep injury, and nonsurgical wound care still requires reassessment.
48.Which findings distinguish cellulitis from deep or necrotizing hand infection?
Cellulitis produces skin warmth, redness, and pain, but visible erythema does not establish that infection is superficial. A puncture can seed a thenar, palmar, or web-space abscess requiring drainage with antibiotics. Examine the distribution of swelling and tenderness and use imaging when needed to locate a deep collection. Severe pain and swelling disproportionate to skin changes, rapid progression, and systemic illness raise concern for necrotizing infection. This requires immediate assessment, intravenous antibiotics, and urgent surgical removal of devitalized tissue. See [ASSH hand-infection guidance](https://assh.my.site.com/handcare/condition/hand-infection).
Apply it
A patient develops marked palmar swelling after a puncture despite limited skin redness. Investigate deep infection. Rapid deterioration with disproportionate pain and systemic illness demands an emergency pathway rather than treatment as uncomplicated cellulitis.
Common pitfall: Mild skin changes do not exclude dangerous deep infection. Antibiotics alone cannot reliably treat an established abscess or remove necrotic fascia.
49.How do wound preparation and blood supply determine coverage selection?
Before coverage, irrigate the traumatic wound, remove contaminants and nonviable tissue, evaluate associated injuries, and assess tetanus protection. A graft initially depends on the recipient bed for blood supply; a flap transfers tissue with its own vascular supply. Exposed bone with inadequate surrounding soft tissue may therefore require shortening or vascularized coverage rather than a thin graft over an unsuitable bed. Choose coverage after defining both tissue viability and the structural defect.
Apply it
A dirty crushed fingertip has devitalized tissue and exposed bone. Clean and debride it, assess deeper injury and tetanus status, then evaluate shortening or flap coverage according to the remaining vascularized tissue.
Common pitfall: Antibiotics do not remove foreign bodies or dead tissue. A technically neat closure or graft over an inadequately prepared, poorly vascularized wound can fail.
50.Why does a small knuckle wound after a punch require urgent bite assessment?
A wound sustained by striking teeth can penetrate an MCP joint despite a small skin opening. BSSH recommends urgent exploration for these fight bites because of the risk of joint sepsis. Define joint, tendon, bone, and vascular involvement; irrigate and debride the wound and start systemic antibiotics promptly, selecting coverage according to the injury, allergies, and local guidance. Assess tetanus protection and blood-borne viral exposure risk. Do not close the wound before its contamination and depth are addressed. See [BSSH human and animal bite standards](https://www.bssh.ac.uk/_userfiles/pages/files/professionals/Trauma%20standards/8%20Bites.pdf).
Apply it
A patient presents after punching another person's mouth, with a small dorsal MCP wound and increasing pain. Treat the mechanism as a potential penetrating bite and arrange urgent exploration and antimicrobial treatment.
Common pitfall: The skin wound's size does not establish injury depth. Waiting for established infection before addressing possible joint penetration risks preventable joint damage.
ABOS Surgery of the Hand Subspecialty Examination Blueprint · Chapter-25-Hand-Fractures-and-Dislocations.pdf
51.What tissue creates the cords in Dupuytren disease?
Dupuytren disease affects the palmar fascia, a fibrous layer beneath the skin and superficial to tendons and deeper structures. Nodules and cords develop as this tissue thickens and contracts, progressively limiting finger extension in some patients. The flexor tendons are not the diseased cords. This anatomical distinction explains why a fixed fascial tether differs from a trigger digit's catching tendon. Evaluate the location of cords, joint contracture, sensation, and functional interference when discussing treatment.
Apply it
A patient has a gradually developing palmar cord and cannot fully straighten the ring finger. Explain that contracted fascia is tethering extension, rather than describing the visible cord as a shortened flexor tendon.
Common pitfall: A cord that resembles a tendon is not necessarily tendon tissue. Confusing fascial disease with tendon catching leads to incorrect explanations and mismatched treatment choices.
52.How do function and joint involvement guide the choice among Dupuytren treatments?
Observation is appropriate for minimally troublesome nodules or contracture because progression varies and treatment does not cure the underlying disease. Function-limiting contracture warrants discussion of procedures that release or remove the contracted fascia. Needle aponeurotomy divides a cord through needle punctures without removing the diseased tissue. Collagenase injection enzymatically weakens the cord, followed by manipulation to disrupt it. These approaches generally involve less recovery burden than open fasciectomy, but recurrent contracture remains an important tradeoff. Fasciectomy removes diseased fascia through an incision and generally requires more wound care and rehabilitation; recurrence can still occur. PIP contractures are harder to correct completely than MCP contractures, particularly when longstanding joint stiffness accompanies the fascial cord.
Apply it
A patient with a small palmar nodule and unrestricted daily activities can be observed. Another patient whose contracted finger interferes with gloves, pockets, or hand placement needs measurements of MCP and PIP extension deficits and comparison of procedural tradeoffs. Someone prioritizing a shorter recovery may favor cord division or collagenase, while someone accepting a larger operation may consider fasciectomy. Explain that a longstanding PIP deficit may remain partly uncorrected after the cord is treated.
Common pitfall: Cord division and fasciectomy are different procedures: one interrupts the tether, while the other removes diseased fascia. Neither eliminates the tendency to develop further disease. Do not promise permanent correction or assume every PIP extension deficit comes exclusively from a cord; secondary joint contracture can limit correction. Forceful stretching is not an established method of preventing progression and can injure the hand.
General principles/other13%
53.What makes consent an informed clinical decision?
Informed consent requires assessment of the patient's ability to understand and decide, explanation of the diagnosis and proposed intervention, and discussion of material benefits, burdens, risks, and alternatives, including foregoing treatment. The AMA emphasizes presenting information accurately and sensitively and documenting the conversation and decision. A signed form records part of this process but does not establish understanding. The practical task is to connect choices with the patient's goals and allow a voluntary, adequately informed decision.
Apply it
Before elective thumb reconstruction, a patient signs the form but believes normal strength is guaranteed. Revisit expected outcomes, limitations, alternatives, and uncertainty, then confirm understanding before treating the signature as an informed authorization.
Common pitfall: A signature cannot repair a material misunderstanding. Consent is a communication and decision process, and a technically complete form does not establish that process occurred.
54.When does the emergency exception permit treatment without prior consent?
The AMA recognizes an emergency exception when a decision must be made urgently, the patient cannot participate, and a surrogate is unavailable. Treatment may then begin without prior informed consent to meet the immediate clinical need. The patient or surrogate should be informed as soon as possible, and consent obtained for ongoing care. The defining conditions are urgency and inability to obtain a decision, rather than convenience, scheduling pressure, or disagreement with an available capable patient.
Apply it
An unconscious patient requires immediate treatment to address a serious traumatic threat, and no surrogate can be reached in time. Provide necessary emergency care, document the circumstances, and explain the intervention when participation becomes possible.
Common pitfall: Urgency alone does not erase the choices of a capable patient. The exception is narrow and does not authorize unrelated elective procedures during an emergency operation.
55.How can multimodal pain care be applied after a distal radius fracture?
The AAOS/ASSH guideline recommends considering opioid-sparing multimodal pain care as a consensus statement because sufficient fracture-specific comparative evidence was unavailable. Options include local anesthetics, acetaminophen, NSAIDs, ice, elevation, suitable compression, and cognitive approaches to coping with pain. For an appropriate patient, combine acetaminophen and a suitable NSAID with protected ice application, elevation, and relaxation or coping strategies; a procedural local anesthetic may address reduction or surgery. Select components using comorbidities, concurrent medicines, contraindications, and the treatment stage, then reassess pain and function. No particular combination is established as universally superior.
Apply it
After fracture treatment, review renal, gastrointestinal, hepatic, bleeding, and medication risks before selecting analgesics. Pair suitable medicines with elevation and protected ice, explain safe use, and reassess relief, adverse effects, and participation in permitted activity. Unexpectedly escalating pain requires clinical reassessment.
Common pitfall: Multimodal care does not mean using every option. Avoid duplicate acetaminophen-containing products, unsuitable NSAIDs, and constrictive compression; retain the consensus designation rather than claiming strong evidence for one regimen.
Management of Distal Radius Fractures Evidence-Based Clinical Practice Guideline
56.Why must rehabilitation follow the reconstruction rather than wound appearance?
A healed skin incision can coexist with immature tendon repair, stiff joints, or recovering nerves. Rehabilitation should therefore reflect the structures repaired and their permitted loads. AAOS describes bracing and therapy after replantation to protect repairs, maintain movement, and limit scar-related restriction. Functional recovery may continue long after the surgical wound closes. Define protection, safe motion, sensory needs, and meaningful daily tasks together instead of using external appearance as the sole marker of readiness.
Apply it
After replantation, a patient's skin has healed but motion and sensation remain limited. Continue structure-specific therapy and protection, linking progress to useful tasks rather than clearing unrestricted activity because the incisions are closed.
Common pitfall: Wound closure is an early milestone, not a complete recovery measure. A generic exercise prescription can either overload healing structures or underuse joints that need safe movement.
57.Why can a ganglion recur after aspiration?
A ganglion is a fluid-filled swelling arising from tissues around a joint or tendon sheath, often connected by a stalk. Aspiration removes fluid but generally leaves the origin and connection in place, allowing recurrence. An asymptomatic typical ganglion may be observed, while symptoms or uncertainty about the diagnosis can justify further assessment. Volar wrist location deserves particular anatomical care because important vessels and nerves may lie close to the swelling and any proposed procedure.
Apply it
A dorsal wrist lump disappears after aspiration but returns months later with the same typical features. Explain that drainage did not remove its connection to the joint and reassess whether symptoms justify additional treatment.
Common pitfall: Recurrence after aspiration does not itself imply malignancy or infection. Conversely, an atypical mass should not be assumed to be a ganglion solely because hand ganglia are common.
58.How can a benign enchondroma cause a clinically important fracture?
An enchondroma is a benign cartilage tumor within bone and is common in the small bones of the hand. Although many are incidental and painless, a lesion can weaken a phalanx or metacarpal enough to permit a pathologic fracture. Benign describes biological behavior, not mechanical strength. Evaluate the lesion's imaging features and the source of pain. Persistent unexplained pain at rest or at night warrants closer assessment rather than automatic attribution to an uncomplicated enchondroma.
Apply it
A finger fractures after relatively minor trauma, and radiographs reveal an intramedullary cartilage lesion. Consider an enchondroma-associated pathologic fracture while assessing whether the lesion's features and symptoms remain consistent with a benign process.
Common pitfall: A benign tumor can still require treatment because of structural weakness. Conversely, pain from a fracture does not by itself establish malignant transformation of the underlying lesion.
59.How can fluoroscopy practice protect patients, surgeons, and operating-room staff?
Reduce unnecessary exposure by planning images, using brief exposures instead of avoidable continuous fluoroscopy, and increasing distance when imaging permits. Use appropriate shielding and dosimeters, and check protective equipment for damage. A mini C-arm still produces ionizing radiation and requires radiation-safety precautions. AAOS emphasizes trained operators, protective equipment, dose monitoring, and maintained imaging systems; its radiation statement is educational guidance based on expert opinion. See [AAOS radiation safety guidance](https://www.aaos.org/globalassets/about/bylaws-library/information-statements/1050-radiationsafety.pdf).
Apply it
During finger fixation, agree on the required views before activating fluoroscopy, use brief acquisitions, shield the team appropriately, and avoid repeated imaging caused by poor positioning or equipment problems.
Common pitfall: Small anatomy and a mini C-arm do not eliminate cumulative exposure. Shielding alone does not replace reducing unnecessary imaging and maintaining equipment.
60.Why should radial or thumb deficiency prompt broader assessment?
A congenital hand difference can be part of a wider developmental pattern rather than an isolated limb finding. BSSH highlights associated organ anomalies, particularly with pre-axial or radial-sided differences, including cardiac and renal involvement. Pediatric assessment can identify a syndrome and help prioritize care. The clinical decision is to examine the whole child and coordinate evaluation before treating reconstruction of the visible hand difference as the only relevant problem.
Apply it
A newborn has a markedly underdeveloped thumb and radial-sided limb difference. Arrange broader pediatric assessment for associated findings and family counseling while developing the hand plan, rather than focusing exclusively on future thumb reconstruction.
Common pitfall: An associated-anomaly risk does not mean every child has a syndrome. It supports deliberate assessment, not a diagnosis based solely on the appearance of the hand.
Congenital Hand Conditions | British Society for Surgery of the Hand
What to focus on during revision
The following are CertMedbry study suggestions. Use the official outline to check the full scope of your examination.
- Give Bone and Joint/ligament equal priority: each represents 20% of the official blueprint. Practise rotational assessment, postreduction measurements, articular congruity, thumb-base fracture mechanics, carpal instability, and arthritis decisions.
- For Nerve, connect each deficit to anatomy, severity, and recovery potential. Calculate CTS-6 from its weighted findings and compare compression, plexus injury, central motor dysfunction, tendon transfer, and nerve transfer using the function each treatment can restore.
- For Muscle/tendon, explain how insertion, pulley restraint, tendon glide, and repair strength determine examination findings and permitted rehabilitation. Practise the Elson examination and distinguish an open Seymour fracture requiring prompt antibiotics and wound treatment from a closed mallet injury.
- Rehearse time-sensitive distinctions: occult fracture protection, residual joint subluxation, deep versus superficial infection, penetrating fight bites, established compartment syndrome, compromised replant circulation, and safe preservation of amputated tissue.
- For Skin/fascia/nails and Circulatory system, make tissue viability and blood supply explicit when choosing wound care, grafting, flaps, or replantation. Distinguish reversible vasospasm from persistent ischemia and structural vascular disease.
- Include concrete multimodal pain care and patient and physician safety in clinical decisions. Complete the official outline beyond this selection, including forearm fractures, additional infection categories and wrist-instability patterns, inflammatory variants, burns, injection injuries, prosthetic selection, additional safety topics, and malignant tumors.
A practical preparation plan
1. Build an outline-based coverage map
Use the dedicated ABOS blueprint as the full syllabus. Allocate initial study time approximately by its seven domain weights, then mark which subtopics these selected concepts address and which require additional reading.
2. Explain the anatomy before choosing treatment
For each case, identify the injured structure, the lost function, and the decisive finding. Sketch relationships such as the thumb UCL and adductor aponeurosis, scaphoid perfusion, flexor pulleys, and ulnar nerve course.
3. Compare competing decisions
Practise pairs that commonly change management: occult versus excluded fracture, congruent versus subluxated joint, partial versus displaced complete ligament tear, temporary versus durable relief, and diagnostic monitoring versus treatment of established compartment syndrome.
4. Complete the questions before reading explanations
Choose one answer and state the decisive cue in your own words. Afterward, review why each alternative is less appropriate. Record whether an error arose from anatomy, evidence applicability, interpretation of a finding, or treatment selection.
5. Use cards for spaced reasoning recall
Recall the answer and its mechanism before turning each card. Revisit missed cards across subsequent sessions, then apply the same principle to a different patient age, injury mechanism, or functional goal.
6. Close gaps and verify current logistics
Return to unstudied blueprint subtopics and their appropriate clinical references. Before examination day, review current ABOS instructions for eligibility, scheduling, timing, breaks, accommodations, and permitted conduct.
Use your sample score as a starting point
The free set contains 20 original practice questions. It is a small learning sample, not an official examination or a validated pass prediction. Review each explanation and its source before moving to another topic.
Start the free sampleOfficial sources and updates
- Surgery of the Hand | ABOS
- ABOS Surgery of the Hand Subspecialty Examination Blueprint
- Rules and Procedures for the Surgery of the Hand Subspecialty Certification and Recertification Examinations
- Management of Distal Radius Fractures Evidence-Based Clinical Practice Guideline
- Management of Carpal Tunnel Syndrome Evidence-Based Clinical Practice Guideline
- Scaphoid Fracture of the Wrist | AAOS OrthoInfo
- K-wire Fixation for Dislocation and Fracture-dislocation of the Proximal Interphalangeal Joint | AO Surgery Reference
- Proximal Phalanx, Base and Shaft, Skier’s Thumb | AO Surgery Reference
- Sprained Thumb | AAOS OrthoInfo
- Dislocation of the Proximal Interphalangeal Joint | AO Surgery Reference
- Arthritis of the Thumb | AAOS OrthoInfo
- Arthritis of the Hand | AAOS OrthoInfo
- Flexor Tendon Mechanism | AO Surgery Reference
- Mallet Finger | AAOS OrthoInfo
- Compartment Syndrome | AAOS OrthoInfo
- Ulnar Nerve Entrapment at the Elbow | AAOS OrthoInfo
- Digital Nerve Lesions in the Hand | AO Surgery Reference
- Replantation | AAOS OrthoInfo
- Fingertip Injuries and Amputations | AAOS OrthoInfo
- Dupuytren’s Disease | AAOS OrthoInfo
- Ganglion Cyst of the Wrist and Hand | AAOS OrthoInfo
- Congenital Hand Conditions | British Society for Surgery of the Hand
- Informed Consent | AMA Code of Medical Ethics
- De Quervain’s Syndrome | British Society for Surgery of the Hand
- Trigger Finger/Thumb | British Society for Surgery of the Hand
- Enchondroma | AAOS OrthoInfo
- Clinical Practice Guidelines | AAOS
- Acute Compartment Syndrome | AAOS
- Management of Acute Compartment Syndrome Evidence-Based Clinical Practice Guideline
- Patient assessment
- Chapter-25-Hand-Fractures-and-Dislocations.pdf
- Tendon Transfer Surgery: Risks & Benefits | The Hand Society
- Vascular Disease: Symptoms & Treatment | The Hand Society
- Brachial Plexus Injuries - OrthoInfo - AAOS
- Cerebral Palsy - OrthoInfo - AAOS
- Raynaud's Phenomenon Symptoms, Types, & Risk Factors | NIAMS
- 1050-radiationsafety.pdf
- cts-auc_hardcopy_1.4.17.pdf
- 8%20Bites.pdf
- Free Flap Monitoring and Salvage | Iowa Head and Neck Protocols - Carver College of Medicine | The University of Iowa
- servlet.FileDownload
- servlet.FileDownload
- Client Challenge
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