In patients without spondylolisthesis or scoliosis undergoing laminectomy for lumbar spinal stenosis, spinal fusion is generally recommended if

the pars interarticularis is fractured.

Deep venous thromboses are primarily composed of red blood cells and fibrin. What is fibrin?

A product of the coagulation cascade

A 6-month-old child has the deformity seen in Figure 10. There are no other known associated problems. What is the etiology of this condition? Review Topic

A defect of the apical ectodermal ridge

A 14-year-old boy is involved in a motor vehicle accident and sustains the injury shown in Figures 18a and 18b. What is the most likely diagnosis? Review Topic

Hawkins type II talar neck fracture

Figure 1 is the MR image of a 14-year-old football player who injured his right knee during a game. He describes feeling a "pop" and then needing help walking off the field. His knee is visibly swollen. The patient undergoes surgery to repair/reconst

no differences in long-term results.

A 17-year-old girl has multidirectional instability of the shoulder. What is the most appropriate initial management?

Physical therapy and home exercises

A 30-year-old patient is indicated for distal femoral osteotomy. This procedure results in survivorship with

a functional result that deteriorates within the first 10 years.

A patient who underwent open reduction and internal fixation of an olecranon fracture 2 months ago now reports painless limitation of motion. Examination reveals a well-healed incision and a flexion-extension arc from 40 degrees to 80 degrees. The pa

Formal physical therapy and static progressive splinting

Master Hand & Wrist EMQ Questions | Dr Hutaif Review

Question 1

A 45-year-old construction worker presents with chronic wrist pain and weakness. Radiographs demonstrate a widened scapholunate interval, proximal migration of the capitate, and advanced osteoarthritic changes at the radioscaphoid and capitolunate joints. Which of the following articulations is characteristically spared in this disease process?

Explanation

The clinical picture describes Scapholunate Advanced Collapse (SLAC). In SLAC wrist, the radiolunate joint is characteristically spared because of the congruent spherical articulation and the robust short radiolunate ligament, which maintains the lunate's relationship with the radius even as the scaphoid rotates and the capitate migrates proximally.

Question 2

During the repair of a complete Zone II laceration of the flexor digitorum profundus (FDP), which biomechanical construct provides the optimal tensile strength to allow for a safe early active motion rehabilitation protocol while minimizing gap formation?

Explanation

Modern principles of Zone II flexor tendon repair emphasize that at least a 4-strand core suture, when combined with an epitendinous running suture, provides sufficient tensile strength and gap resistance to safely endure the stresses of an early active motion protocol. The epitendinous suture increases the repair strength by 10% to 50% and improves tendon gliding.

Question 3

A 55-year-old patient with long-standing rheumatoid arthritis presents with a fixed flexion deformity of the proximal interphalangeal (PIP) joint and hyperextension of the distal interphalangeal (DIP) joint of the right index finger. Which of the following represents the primary pathomechanics of this specific deformity?

Explanation

The patient has a Boutonniere deformity. In rheumatoid arthritis, synovitis at the PIP joint leads to stretching and attenuation of the central slip. This allows the lateral bands to subluxate volarly below the axis of rotation of the PIP joint, where they act as flexors of the PIP joint while continuing to exert a strong extension force on the DIP joint.

Question 4

An avid cyclist presents with profound weakness of the interosseous muscles and adductor pollicis in his right hand. He exhibits a positive Froment's sign. Sensory examination reveals normal two-point discrimination over the volar aspect of the small finger and the dorsal ulnar aspect of the hand. Where is the most likely anatomic site of nerve compression?

Explanation

The patient has isolated motor deficits of the ulnar nerve without sensory involvement, localizing the lesion to Zone 2 of Guyon's canal (which contains only the deep motor branch). Zone 1 contains the mixed nerve, and Zone 3 contains only the superficial sensory branch. Normal dorsal ulnar sensation rules out lesions proximal to the wrist (e.g., cubital tunnel), as the dorsal ulnar cutaneous branch arises 5-8 cm proximal to the wrist.

Question 5

A 22-year-old rugby player felt a sudden 'pop' in his ring finger while trying to grab an opponent's jersey. Examination shows an inability to actively flex the DIP joint. Radiographs show no fractures, and ultrasound indicates the FDP tendon is retracted into the palm (Leddy-Packer Type I). What is the critical timeframe within which primary repair must be performed?

Explanation

A Leddy-Packer Type I 'Jersey finger' involves avulsion of the FDP tendon with retraction all the way into the palm. This disrupts all segmental blood supply (vincula), placing the tendon at high risk for myostatic contracture and avascular necrosis. Primary repair must be performed early, ideally within 7 to 10 days, to allow for successful anatomic reinsertion.

Question 6

A 34-year-old female presents with severe, paroxysmal pain in her right index fingertip. The pain is exacerbated by cold weather. On examination, there is exquisite pinpoint tenderness over the nail bed, and the pain is significantly relieved when a tourniquet is applied to the base of the finger. A faint blue hue is noted beneath the lunula. What is the most likely diagnosis?

Explanation

The classic presentation of a glomus tumor includes the triad of hypersensitivity to cold, severe paroxysmal pain, and localized pinpoint tenderness (Love's test). Hildreth's test (relief of pain with tourniquet ischemia) is highly specific. These benign hamartomas arise from the neuromyoarterial glomus bodies, most commonly in the subungual region.

Question 7

A 28-year-old male falls on an outstretched dorsiflexed hand. Lateral wrist radiographs demonstrate the 'spilled teacup' sign, indicating a lunate dislocation. According to Mayfield's stages of perilunate instability, what structural failure immediately precedes the volar dislocation of the lunate (Stage IV)?

Explanation

Mayfield described a progressive, four-stage sequence of perilunate instability. Stage I: Scapholunate disruption. Stage II: Capitolunate disruption. Stage III: Lunotriquetral disruption. Stage IV: Lunate dislocation (usually volar into the carpal tunnel). Thus, lunotriquetral disruption (Stage III) immediately precedes the enucleation of the lunate.

Question 8

A patient presents with difficulty writing and a weak pinch grip. When asked to form an 'OK' sign, the index finger and thumb pulp meet flatly rather than forming a circle. Sensation over the entire hand is completely intact. Which of the following conditions is the most likely diagnosis?

Explanation

Anterior Interosseous Nerve (AIN) syndrome is a pure motor neuropathy affecting the flexor pollicis longus (FPL), flexor digitorum profundus (FDP) to the index/middle fingers, and the pronator quadratus. The classic clinical sign is the inability to form an 'OK' sign, resulting in a flat pinch. The lack of sensory deficits distinguishes it from Pronator syndrome and Carpal tunnel syndrome.

Question 9

A 19-year-old male sustains a minimally displaced fracture of the proximal pole of the scaphoid. The orthopedic surgeon recommends internal fixation due to the high risk of nonunion and avascular necrosis (AVN). The vulnerability of the proximal pole to AVN is primarily due to its reliance on retrograde blood flow from which of the following vessels?

Explanation

The scaphoid receives 70% to 80% of its blood supply from the dorsal carpal branch of the radial artery. These vessels enter the scaphoid at the distal pole and dorsal ridge, flowing retrogradely to supply the proximal pole. A fracture at the proximal pole disrupts this intraosseous retrograde flow, significantly increasing the risk of AVN.

Question 10

A 40-year-old manual laborer with advanced Kienböck's disease presents with chronic central wrist pain. Radiographs reveal lunate collapse, fixed scaphoid rotary subluxation, and significant carpal height loss, but the radiocarpal and midcarpal articular surfaces remain preserved (Lichtman Stage IIIb). Which of the following surgical options is most appropriate?

Explanation

In Lichtman Stage IIIb Kienböck's disease, there is lunate collapse combined with fixed carpal instability (scaphoid rotary subluxation) and carpal height loss. Joint leveling procedures (radial shortening) or revascularization are no longer effective at this stage. Salvage procedures such as Proximal Row Carpectomy (PRC) or limited intercarpal fusions (e.g., STT or SC fusion) are the standard treatments before extensive arthritis necessitates a total wrist fusion.

Question 11

A 25-year-old basketball player presents with a bony mallet finger involving the middle finger. Radiographs show a dorsal articular avulsion fragment comprising 45% of the distal phalanx articular surface, accompanied by volar subluxation of the distal phalanx. What is the most appropriate management?

Explanation

While most soft tissue and non-subluxated bony mallet fingers are treated with extension splinting, surgical intervention is indicated for bony mallet fingers with >30-40% articular involvement AND volar subluxation of the distal phalanx. Extension block pinning (Ishiguro technique) effectively reduces the fracture and restores joint congruity without the complication risks of open reduction.

Question 12

According to the Eaton-Littler classification of thumb carpometacarpal (CMC) joint osteoarthritis, which radiographic finding specifically differentiates Stage III from Stage II disease?

Explanation

In the Eaton-Littler classification: Stage I has a normal contour but possible joint widening. Stage II shows mild joint space narrowing and osteophytes < 2 mm. Stage III is characterized by significant joint space narrowing, subchondral sclerosis, and osteophytes > 2 mm. Stage IV involves the addition of scaphotrapezial (ST) joint arthritis.

Question 13

A 30-year-old diabetic patient presents to the emergency department with a swollen, painful index finger three days after sustaining a minor puncture wound. Which of Kanavel's four cardinal signs is generally considered the earliest and most sensitive indicator of pyogenic flexor tenosynovitis?

Explanation

Kanavel's signs for pyogenic flexor tenosynovitis are: 1) flexed resting posture, 2) fusiform (sausage-like) swelling, 3) tenderness strictly along the tendon sheath, and 4) pain with passive extension. Pain on passive extension is widely regarded as the earliest and most sensitive clinical sign, as it stretches the inflamed visceral and parietal synovium.

Question 14

A patient presents with a mid-shaft humeral fracture (Holstein-Lewis type) and a concomitant high radial nerve palsy. Examination reveals a complete wrist drop and inability to extend the metacarpophalangeal joints. Which of the following radial nerve-innervated muscles will definitively maintain its function in this specific injury pattern?

Explanation

The branches of the radial nerve that supply the triceps brachii arise in the axilla and proximal humerus, proximal to the mid-shaft and spiral groove regions. Therefore, in a mid-shaft humeral fracture with radial nerve palsy, elbow extension (triceps function) is preserved, while the brachioradialis and all downstream extensors are paralyzed.

Question 15

A 32-year-old new mother complains of severe radial-sided wrist pain exacerbated by lifting her infant. A Finkelstein's test is markedly positive. This pathology involves stenosing tenosynovitis of the first dorsal compartment of the wrist. Which tendons are contained within this compartment?

Explanation

De Quervain's tenosynovitis involves the first dorsal compartment of the wrist. This compartment contains the abductor pollicis longus (APL) and extensor pollicis brevis (EPB) tendons. Anatomical variations, such as multiple APL slips or a distinct sub-compartment for the EPB, are common and can contribute to recalcitrant symptoms.

Question 16

A 27-year-old male suffers a severe crush injury to his left hand in an industrial press. He presents with severe, unrelenting pain out of proportion to the injury and the hand is adopting an intrinsic-minus posture. If a complete hand fasciotomy is required, how many distinct fascial compartments must be released?

Explanation

There are 10 distinct fascial compartments in the hand that may require release in the setting of compartment syndrome. These are: four dorsal interosseous compartments, three volar interosseous compartments, the hypothenar compartment, the thenar compartment, and the adductor pollicis compartment.

Question 17

Following open reduction and internal fixation of a distal radius fracture with a volar locking plate, the patient develops a delayed rupture of the flexor pollicis longus (FPL) tendon. The surgeon placed the plate distal to a critical anatomical landmark, leading to tendon attrition. What is this landmark?

Explanation

The 'watershed line' is a distinct anatomical ridge on the volar surface of the distal radius. It marks the most volar projection of the distal radius. Volar plates placed distal to the watershed line are prominent relative to the flexor tendons, creating a high risk for attritional rupture, particularly of the flexor pollicis longus (FPL) tendon.

Question 18

A pediatric orthopedic surgeon is evaluating a 1-year-old child with congenital syndactyly of the hand. Inherited primarily in an autosomal dominant fashion with incomplete penetrance, what is the most common anatomical location for this anomaly?

Explanation

Congenital syndactyly most commonly affects the third web space, between the middle and ring fingers. It occurs due to a failure of apoptosis during embryogenesis. The second most common site is the fourth web space, followed by the second web space.

Question 19

A 62-year-old female presents with a small, tense, translucent bump over the dorsum of her right index DIP joint. There is a longitudinal groove present in the adjacent fingernail. Which underlying articular pathology is universally associated with this soft tissue mass?

Explanation

The lesion described is a mucous cyst, which is a type of ganglion cyst that arises from the distal interphalangeal (DIP) joint. It is virtually always associated with underlying osteoarthritis of the DIP joint and the presence of dorsal osteophytes (Heberden's nodes). Successful surgical treatment requires excision of the cyst stalk and debridement of the underlying osteophyte.

Question 20

A trauma patient sustains an ulnar nerve laceration. The physical examination reveals a severe claw hand deformity (hyperextension of the MCP joints and flexion of the IP joints of the ring and small fingers). A lesion at the wrist paradoxically produces a more severe claw deformity than a lesion at the elbow. What is the physiological basis for this 'ulnar paradox'?

Explanation

The 'ulnar paradox' occurs because a high ulnar nerve injury (above the elbow) paralyses not only the intrinsic hand muscles but also the ulnar half of the Flexor Digitorum Profundus (FDP). Without active FDP contraction, there is less forceful flexion at the DIP joints of the ring and small fingers, resulting in a milder claw posture. In a low lesion, the FDP remains innervated and its unantagonized pull exacerbates the clawing.

Question 21

A 35-year-old male presents with a high radial nerve palsy following a humerus fracture. He is planned for a Boyes tendon transfer to restore wrist and finger extension. Which of the following describes the standard Boyes transfer for restoring finger extension?

Explanation

In the Boyes transfer for radial nerve palsy, the FDS of the middle finger is routed through the interosseous membrane to the EDC to restore finger extension. Pronator teres to ECRB is utilized for wrist extension, and FCR to EDC is characteristic of the Brand transfer.

Question 22

A 62-year-old female with long-standing rheumatoid arthritis presents with an inability to actively extend her ring and small fingers at the metacarpophalangeal joints. She can still extend her index and middle fingers. The tenodesis effect is absent in the affected digits. What is the most appropriate management?

Explanation

This patient has Vaughan-Jackson syndrome, characterized by sequential rupture of the extensor tendons from the ulnar to the radial side due to attrition over a prominent distal ulna (caput ulnae). Treatment involves removing the prominent ulnar head (e.g., Darrach or Suave-Kapandji) and transferring the ruptured EDQ and EDC of the ring/small fingers side-to-side to the intact EDC of the middle finger.

Question 23

According to the Watson staging system for Scapholunate Advanced Collapse (SLAC) wrist, which articulation is characteristically spared from degenerative changes even in advanced stages?

Explanation

In the SLAC wrist, the radiolunate articulation is classically spared because the lunate maintains a concentric, congruent relationship with the spherical lunate fossa of the distal radius, unlike the scaphoid which becomes flexed and incongruent. Stage I involves the radial styloid-scaphoid joint; Stage II involves the entire radioscaphoid joint; Stage III involves the capitolunate joint.

Question 24

A 40-year-old carpenter presents with the inability to make an 'OK' sign with his thumb and index finger. Sensation in his hand is entirely normal. Which of the following muscles is most likely to be affected?

Explanation

Anterior Interosseous Nerve (AION) palsy presents with pure motor deficits affecting the Flexor Pollicis Longus (FPL), Flexor Digitorum Profundus (FDP) to the index (and sometimes middle) finger, and the pronator quadratus. This results in the inability to flex the IP joint of the thumb and the DIP joint of the index finger (a positive 'OK' sign).

Question 25

A 22-year-old rugby player avulses his flexor digitorum profundus (FDP) tendon of the ring finger. On surgical exploration, the tendon is found retracted to the level of the A2 pulley but is held there by an intact vinculum longum. According to the Leddy and Packer classification, what type of injury is this?

Explanation

Leddy and Packer classification of FDP avulsion (Jersey finger): Type I: Retracted to the palm (blood supply severed, needs repair within 7-10 days). Type II: Retracted to the A3 pulley/PIP joint level (held by an intact vinculum longum). Type III: Bony fragment avulsed, caught at the A4 pulley. Type IV: Bony avulsion with simultaneous FDP tendon avulsion from the fracture fragment.

Question 26

A child is born with a hypoplastic thumb. Radiographs show the absence of the proximal third of the first metacarpal and severe carpometacarpal joint instability. According to the Blauth classification of thumb hypoplasia, what is the most appropriate definitive surgical treatment?

Explanation

The child has a Blauth Type IIIb thumb hypoplasia (absence of the proximal metacarpal and a deficient CMC joint). Types IIIb, IV, and V are best treated with thumb ablation and index finger pollicization. Types I, II, and IIIa (stable CMC) are treated with reconstruction (opponensplasty, web space widening).

Question 27

A 50-year-old mechanic presents with pain, cold intolerance, and a pulsatile mass in the hypothenar eminence. An Allen test is abnormal. Angiography reveals an occlusion of the superficial palmar arch. Which structure is most likely acting as the source of repetitive trauma to the affected vessel?

Explanation

Hypothenar hammer syndrome is caused by repetitive trauma to the ulnar artery as it passes over the hook of the hamate in Guyon's canal. This leads to thrombosis or aneurysm formation of the superficial palmar arch.

Question 28

A 45-year-old male sustains a wrist injury. Radiographs demonstrate an intra-articular fracture of the volar rim of the distal radius with volar subluxation of the carpus. This injury pattern is best described as a:

Explanation

A Barton fracture is a shear-type, intra-articular fracture of the distal radius with dislocation or subluxation of the radiocarpal joint. It can be volar (more common) or dorsal. A Smith fracture is an extra-articular distal radius fracture with volar angulation.

Question 29

The major blood supply to the proximal pole of the scaphoid enters the bone at which anatomical location?

Explanation

The scaphoid receives its primary blood supply from the dorsal carpal branch of the radial artery, which enters along the dorsal ridge in the distal half of the bone and provides retrograde flow to the proximal pole. This retrograde blood supply makes proximal pole fractures highly susceptible to avascular necrosis.

Question 30

During active ulnar deviation of the normal wrist, what coupled motion occurs at the proximal carpal row?

Explanation

During ulnar deviation of the wrist, the scaphoid extends, driving the entire proximal carpal row into extension. Simultaneously, the proximal row translates radially to accommodate the articulation between the capitate and triquetrum.

Question 31

A 32-year-old diabetic patient presents with profound swelling, erythema, and tenderness localized to the volar aspect of the distal phalanx of the thumb. The swelling does not extend proximal to the distal flexion crease. What is the most appropriate initial surgical approach for drainage?

Explanation

The patient has a felon, which is a closed-space infection of the pulp of the distal phalanx. The standard recommended surgical drainage is via a mid-lateral (or unilateral longitudinal) incision to avoid scarring the sensitive tactile volar pad and to adequately disrupt the vertical septa. Fish-mouth incisions are generally discouraged due to painful scarring and tip deformities.

Question 32

A patient demonstrates normal function of all intrinsic muscles of the hand despite an isolated complete transection of the ulnar nerve at the elbow. Which of the following anatomic variants best explains this clinical finding?

Explanation

A Martin-Gruber anastomosis is a communication between the median and ulnar nerves in the forearm. Motor fibers travel with the median nerve down the arm and cross over to the ulnar nerve in the forearm to innervate the intrinsic muscles of the hand, preserving hand intrinsic function even if the ulnar nerve is transected proximal to the anastomosis. Riche-Cannieu is a median-ulnar connection in the palm.

Question 33

A 45-year-old female complains of severe, exquisitely localized pain in the nail bed of her index finger, which worsens dramatically with cold exposure. Examination reveals a subtle bluish discoloration under the nail plate. Which of the following triad of signs is pathognomonic for this condition?

Explanation

The classic triad for a glomus tumor includes severe localized pain, exquisite point tenderness (positive Love's test with a paperclip or pin), and cold sensitivity. Hildreth's test (relief of pain with a proximal tourniquet) is also highly specific for a glomus tumor.

Question 34

According to the Eaton-Littler classification for basal joint (thumb CMC) arthritis, what characterizes Stage III disease?

Explanation

Eaton-Littler classification of thumb CMC arthritis: Stage I: widened joint space (synovitis). Stage II: mild joint space narrowing, osteophytes <2mm. Stage III: marked joint space narrowing, sclerosis, and osteophytes >2mm. Stage IV: pantrapezial arthritis (involvement of the STT joint in addition to the CMC joint).

Question 35

A 28-year-old sustains a low median nerve transection at the wrist. To restore opposition, an opponensplasty using the extensor indicis proprius (EIP) (Burkhalter transfer) is planned. To optimize the biomechanics of true opposition, the line of pull for the transferred tendon should be directed toward which anatomical landmark?

Explanation

True opposition of the thumb requires palmar abduction, flexion, and pronation. To recreate this combined motion during an opponensplasty (like the EIP or FDS transfers), the tendon should be routed from the thumb metacarpophalangeal joint toward the pisiform to provide the optimal line of pull for pronation and palmar abduction.

Question 36

A 5-year-old child sustains a displaced phalangeal neck fracture of the proximal phalanx. Which complication is most uniquely associated with failing to anatomically reduce the extension deformity in this specific pediatric fracture?

Explanation

Pediatric phalangeal neck fractures typically displace with the distal fragment in extension. If left unreduced, the distal prominent aspect of the proximal fragment fills the subcondylar fossa. Because the PIP joint requires the subcondylar fossa to accommodate the dorsal lip of the middle phalanx during flexion, obliteration of this space leads to a mechanical block to PIP flexion.

Question 37

The Palmer classification is used for Triangular Fibrocartilage Complex (TFCC) lesions. A traumatic avulsion of the TFCC from its distal attachment at the lunate or triquetrum is classified as:

Explanation

Palmer classification of traumatic (Class 1) TFCC tears: 1A = central perforation; 1B = ulnar avulsion (with or without an ulnar styloid fracture); 1C = distal avulsion (from the carpus - lunate/triquetrum via ulnotriquetral/ulnolunate ligaments); 1D = radial avulsion (from the sigmoid notch). Class 2 represents degenerative tears.

Question 38

During a surgical release for de Quervain's tenosynovitis, the surgeon must be cautious of anatomical variants. The first dorsal extensor compartment typically contains the Extensor Pollicis Brevis (EPB) and the Abductor Pollicis Longus (APL). What is the most common anatomical variation found within this compartment?

Explanation

Anatomical variations in the first dorsal compartment are a frequent cause of surgical failure in de Quervain's release. The most common variation is the presence of multiple slips of the APL tendon (present in up to 80% of individuals). A separate subcompartment (septation) for the EPB is present in approximately 40-60% of patients, not 95%.

Question 39

When establishing the 3-4 portal for wrist arthroscopy, the arthroscope is inserted between which two extensor compartments?

Explanation

The 3-4 portal is the standard viewing portal for wrist arthroscopy. It is located just distal to Lister's tubercle, between the 3rd extensor compartment (extensor pollicis longus) and the 4th extensor compartment (extensor digitorum communis and extensor indicis proprius).

Question 40

In a complete rupture of the ulnar collateral ligament (UCL) of the thumb metacarpophalangeal joint (Stener lesion), healing is prevented due to the interposition of which structure between the torn ends of the ligament?

Explanation

A Stener lesion occurs when the distal attachment of the thumb UCL avulses and gets trapped superficial to the adductor aponeurosis. The adductor aponeurosis acts as a mechanical barrier between the torn ligament and its insertion site, preventing spontaneous healing and necessitating surgical repair.

Question 41

A 45-year-old construction worker presents with the inability to actively extend his thumb, index, and middle fingers after sustaining a midshaft humerus fracture 6 months ago. EMG shows no evidence of reinnervation. A decision is made to proceed with tendon transfers. If the Pronator Teres (PT) is transferred to the Extensor Carpi Radialis Brevis (ECRB) to restore wrist extension, which of the following combinations is most commonly used to restore finger and thumb extension?

Explanation

The most common tendon transfers for a high radial nerve palsy are the PT to ECRB (to restore wrist extension), the FCR to the EDC (to restore finger extension), and the PL to the EPL (to restore thumb extension). The FCR is generally preferred over the FCU for finger extension to preserve the FCU's critical role in the dart-throwing motion and strong grip.

Question 42

A 35-year-old cyclist presents with weakness in pinching and crossing his fingers. Physical examination reveals pronounced atrophy of the first dorsal interosseous muscle and weak thumb adduction. Two-point discrimination is 4 mm over both the volar and dorsal aspects of the small finger. Sensation over the hypothenar eminence is intact. A mass compressing the ulnar nerve is suspected. In which zone of Guyon's canal is the lesion most likely located?

Explanation

Guyon's canal is divided into three zones. Zone 1 extends from the proximal edge of the palmar carpal ligament to the bifurcation of the ulnar nerve; compression here causes mixed motor and sensory deficits. Zone 2 contains the deep motor branch and extends from the bifurcation to the deep motor arch; compression here causes isolated motor deficits (interossei, adductor pollicis, and deep heads of the FPB and lumbricals) with spared sensation, as seen in this patient. Zone 3 contains the superficial sensory branch; compression here causes isolated sensory loss to the volar ring and small fingers.

Question 43

A 40-year-old female presents with severe, paroxysmal pain in her ring finger that is exacerbated by cold weather. On examination, there is exquisite point tenderness at the base of the nail bed. The pain completely resolves temporarily when a blood pressure cuff is inflated around her upper arm. What is the most likely diagnosis?

Explanation

The patient's clinical presentation is classic for a glomus tumor. The triad of symptoms includes temperature sensitivity (cold intolerance), severe paroxysmal pain, and exquisite point tenderness (Love's pin test). The temporary relief of pain upon inflation of a tourniquet to induce ischemia is known as Hildreth's sign, which is highly specific for a glomus tumor.

Question 44

A 62-year-old male presents with chronic, severe wrist pain. Radiographs demonstrate advanced radiocarpal arthritis with complete obliteration of the radioscaphoid and capitolunate joint spaces. The radiolunate joint is entirely preserved. Which of the following anatomical structures is responsible for the preservation of the radiolunate joint in this condition?

Explanation

The patient has Stage III Scapholunate Advanced Collapse (SLAC) wrist, which involves capitolunate arthritis. A hallmark of SLAC wrist is the universal preservation of the radiolunate joint. This is due to the concentric, spherical congruency of the radiolunate articulation and the absence of strong anomalous forces, which are maintained by the intact long radiolunate ligament and the stabilizing sling effect of the radioscaphocapitate (RSC) ligament.

Question 45

A 14-year-old girl presents with progressive bilateral wrist pain and deformity. Radiographs reveal increased volar and ulnar tilt of the distal radial articular surface, a V-shaped configuration of the carpus with proximal subsidence of the lunate, and dorsal subluxation of the distal ulna. This condition is most strongly associated with a mutation in which of the following genes?

Explanation

The patient has Madelung deformity, characterized by a premature growth arrest of the volar and ulnar aspects of the distal radius physis. It is highly associated with Léri-Weill dyschondrosteosis, a condition caused by a mutation or deletion in the SHOX (Short Stature Homeobox) gene located on the pseudoautosomal region of the sex chromosomes.

Question 46

At what age should a child with a simple, complete syndactyly of the thumb and index finger undergo surgical release?

Explanation

Syndactyly of the border digits (thumb-index and ring-small) should be released early, typically by 6 months of age. This prevents progressive flexion and angular deformities caused by the differing longitudinal growth rates of the adjacent, tethered fingers. In contrast, syndactyly of central digits (e.g., middle-ring) is usually released later, between 12 and 18 months of age.

Question 47

A 60-year-old woman with long-standing rheumatoid arthritis presents with a sudden inability to actively extend her small and ring fingers at the metacarpophalangeal (MCP) joints. Over the next two weeks, the inability to extend the fingers progresses to involve the middle finger. Which of the following is the most likely underlying mechanism for this condition?

Explanation

This presentation is classic for Vaughan-Jackson syndrome, which is characterized by a sequential rupture of the extensor tendons in rheumatoid arthritis patients, typically progressing from ulnar to radial. It is caused by mechanical attrition of the tendons rubbing against a prominent, dorsally subluxated distal ulna (caput ulnae) combined with chronic tenosynovitis.

Question 48

A 45-year-old carpenter complains of progressive wrist pain over the ulnar aspect. Radiographs show positive ulnar variance with subchondral cystic changes in the lunate and ulnar head. MRI demonstrates a central tear of the triangular fibrocartilage complex (TFCC). Following a failed 6-month trial of conservative management, what is the most appropriate surgical intervention?

Explanation

The patient has ulnar impaction syndrome with positive ulnar variance. An ulnar shortening osteotomy is the most appropriate surgical treatment for a patient with positive ulnar variance and an intact DRUJ, as it directly addresses the mechanical overload while tightening the ulnocarpal ligaments. An arthroscopic wafer procedure is generally reserved for patients with neutral or slightly positive variance (less than 2-3 mm) or when avoiding osteotomy hardware is desired, but shortening osteotomy remains the gold standard for distinct positive variance.

Question 49

During surgical exploration for a severed flexor tendon in the thumb, preservation of which of the following pulley systems is most critical to prevent bowstringing of the Flexor Pollicis Longus (FPL)?

Explanation

The flexor pulley system of the thumb consists of two annular pulleys (A1, A2) and one oblique pulley. The oblique pulley, located over the mid-portion of the proximal phalanx, is the most critical pulley in the thumb to prevent bowstringing of the FPL tendon. It is analogous in importance to the A2 and A4 pulleys in the fingers.

Question 50

A 55-year-old female presents with the sudden inability to flex the interphalangeal (IP) joint of her right thumb. She has a 10-year history of rheumatoid arthritis. Radiographs of the wrist show advanced carpal collapse. Which of the following is the most likely cause of this tendon rupture?

Explanation

This patient has Mannerfelt-Norman syndrome, which is the spontaneous rupture of the Flexor Pollicis Longus (FPL) tendon. In patients with rheumatoid arthritis, this rupture most commonly occurs secondary to attrition rubbing against a sharp volar osteophyte projecting from the scaphoid (or less commonly, the trapezium) as it enters the carpal tunnel.

Question 51

A 28-year-old mechanic sustains a high-pressure paint injection injury to the volar aspect of his right index finger. He presents to the ER 2 hours later with a small puncture wound, mild swelling, and minimal pain. What is the most appropriate immediate management?

Explanation

High-pressure injection injuries to the hand are surgical emergencies, despite often presenting with benign-appearing, small puncture wounds and minimal initial pain. The injected material (paint, grease, oil) travels rapidly along tissue planes, causing severe chemical irritation, tissue necrosis, and compartmental pressure elevation. Emergent, extensive open surgical debridement and irrigation in the operating room are required to prevent severe morbidity, including amputation.

Question 52

A newborn is evaluated for a congenital hand anomaly and is found to have a completely duplicated thumb on the right hand. Radiographs show a single first metacarpal with two complete proximal phalanges and two distal phalanges. According to the Wassel classification, what type of radial polydactyly is this?

Explanation

The Wassel classification describes radial polydactyly. Type IV involves duplication of both the proximal and distal phalanges with a single (often broad or bifid at the distal end) metacarpal. It is the most common type of radial polydactyly, accounting for roughly 40-50% of cases. Type II is a duplicated distal phalanx. Type VI is a duplicated metacarpal with duplicated phalanges.

Question 53

In the surgical treatment of established compartment syndrome of the hand, standard dorsal incisions are used to release the interosseous compartments. To fully release all dorsal and volar interosseous muscles, as well as the adductor compartment, where should the dorsal longitudinal incisions be placed?

Explanation

The hand contains 10 compartments (4 dorsal interossei, 3 volar interossei, thenar, hypothenar, adductor). The interosseous compartments are typically released via two dorsal longitudinal incisions placed over the 2nd and 4th metacarpals. The incision over the 2nd metacarpal allows access to the 1st and 2nd dorsal interossei, the 1st volar interosseous, and the adductor pollicis. The incision over the 4th metacarpal allows access to the 3rd and 4th dorsal interossei and the 2nd and 3rd volar interossei.

Question 54

A 24-year-old male presents with right wrist pain after a fall on an outstretched hand. Radiographs reveal a scaphoid waist fracture. Which of the following describes the primary blood supply to the scaphoid, explaining its propensity for nonunion and avascular necrosis?

Explanation

The scaphoid's blood supply is highly precarious. Approximately 70-80% of the blood supply comes from the dorsal carpal branch of the radial artery, which enters the scaphoid at the dorsal ridge (near the waist/distal third) and supplies the proximal pole in a retrograde fashion. Consequently, fractures at the waist or proximal pole disrupt this retrograde flow, putting the proximal fragment at high risk for avascular necrosis and nonunion.

Question 55

A 38-year-old female presents with pain and swelling over the dorsal forearm, approximately 4-6 cm proximal to the wrist joint. The pain is exacerbated by repetitive wrist flexion and extension. On examination, there is crepitus over the distal radial forearm. She is diagnosed with intersection syndrome. This condition involves tenosynovitis at the crossing point of which of the following extensor compartments?

Explanation

Intersection syndrome is an inflammatory tenosynovitis occurring at the anatomic intersection where the muscle bellies of the 1st extensor compartment (Abductor Pollicis Longus and Extensor Pollicis Brevis) cross obliquely over the tendons of the 2nd extensor compartment (Extensor Carpi Radialis Longus and Extensor Carpi Radialis Brevis) in the distal dorsal forearm, typically 4 to 8 cm proximal to Lister's tubercle.

Question 56

A 30-year-old male presents with pain in the center of his wrist. MRI reveals Kienböck's disease. Radiographs show lunate sclerosis and collapse, but the overall carpal height is maintained, and there is no fixed rotary subluxation of the scaphoid. His ulnar variance is negative 3 mm. According to the Lichtman classification, what is the stage and most appropriate initial surgical treatment for this patient?

Explanation

The patient has Lichtman Stage IIIA Kienböck's disease, defined by lunate collapse/fragmentation but with preserved carpal height and normal scaphoid alignment (no fixed rotary subluxation). In a patient with negative ulnar variance, a joint-leveling procedure such as a radial shortening osteotomy unloads the lunate and is the most appropriate surgical treatment. Stage IIIB involves fixed scaphoid subluxation and loss of carpal height, typically requiring salvage procedures like STT fusion or PRC.

Question 57

Which of the following intrinsic hand muscles is innervated by the median nerve in the majority of individuals?

Explanation

The median nerve typically innervates the 'LOAF' muscles: the 1st and 2nd Lumbricals, the Opponens pollicis, the Abductor pollicis brevis, and the superficial head of the Flexor pollicis brevis (FPB). The deep head of the FPB, adductor pollicis, palmaris brevis, and all interossei are normally innervated by the deep motor branch of the ulnar nerve.

Question 58

A 50-year-old male construction worker presents with a cold, painful ring finger. He frequently uses the palm of his hand to strike objects into place. Angiography shows an occlusion of the ulnar artery with a characteristic 'corkscrew' appearance of the superficial palmar arch. Which anatomic structure acts as an anvil, contributing to the repetitive intimal trauma of the artery in this syndrome?

Explanation

The patient has Hypothenar Hammer Syndrome, resulting from repetitive blunt trauma to the hypothenar eminence. The ulnar artery is vulnerable as it exits Guyon's canal because it runs superficially over the hook of the hamate, which acts as a rigid bony anvil against which the artery is repeatedly crushed, leading to intimal damage, thrombosis, and potential embolization to the digital arteries.

Question 59

A 45-year-old woman is evaluated for a severe hyperextension injury to her PIP joint. Physical exam reveals a 'swan neck' deformity that is flexible passively but cannot be corrected actively. What is the primary anatomical disruption causing this specific deformity pattern following trauma?

Explanation

A swan neck deformity consists of PIP joint hyperextension and DIP joint flexion. Following a traumatic hyperextension injury, it is primarily caused by attenuation or rupture of the volar plate at the PIP joint. This allows the PIP joint to hyperextend, causing the lateral bands to subluxate dorsally to the axis of rotation, increasing extension forces at the PIP and reciprocal flexion forces at the DIP. Central slip rupture causes a boutonnière deformity.

Question 60

A 55-year-old female with primary osteoarthritis of the hand presents with pain and deformity at the distal interphalangeal (DIP) joints. On exam, she has prominent dorsal nodules at the base of the distal phalanges. Which of the following is the pathologic hallmark of these specific nodules?

Explanation

The dorsal nodules described are Heberden's nodes, which are pathognomonic for osteoarthritis of the hand. They represent marginal osteophyte formation at the distal interphalangeal (DIP) joints. Bouchard's nodes are similar osteophytes found at the proximal interphalangeal (PIP) joints.

Question 61

A 32-year-old male with a 5-year history of an untreated scaphoid fracture presents with worsening wrist pain. Radiographs demonstrate advanced arthritis at the radioscaphoid and scaphocapitate joints, while the lunocapitate and radiolunate joints are completely spared. Which of the following is the most appropriate surgical treatment?

Explanation

This patient has Stage II/III Scaphoid Nonunion Advanced Collapse (SNAC). Scaphoid excision and four-corner arthrodesis is the most appropriate treatment, as proximal row carpectomy is contraindicated when capitate head cartilage is worn.

Question 62

A 55-year-old female treated non-operatively for a nondisplaced distal radius fracture presents 6 weeks post-injury with a sudden inability to actively extend her thumb interphalangeal joint. The tenodesis effect is absent for the thumb. What is the primary pathomechanical cause of this complication?

Explanation

Extensor pollicis longus (EPL) rupture after nondisplaced distal radius fractures typically occurs due to mechanical attrition and focal ischemia within the intact third dorsal compartment. The standard treatment is an extensor indicis proprius (EIP) to EPL tendon transfer.

Question 63

During a regional fasciectomy for severe Dupuytren's contracture of the ring finger, the neurovascular bundle is identified and found to be displaced centrally and volarly. Which of the following pathological cords is primarily responsible for this dangerous anatomical shift?

Explanation

The spiral cord causes medial and volar displacement of the neurovascular bundle, putting it at high risk of iatrogenic injury during excision. It is formed by the pretendinous band, spiral band, lateral digital sheet, and Grayson's ligament.

Question 64

A 65-year-old female with advanced rheumatoid arthritis presents with a sudden inability to actively extend her small and ring fingers at the metacarpophalangeal joints. Examination reveals a prominent, dorsally subluxated distal ulna. What is the most appropriate surgical management?

Explanation

This is Vaughan-Jackson syndrome, characterized by sequential attrition ruptures of the digital extensor tendons from ulnar to radial over a dorsally subluxated distal ulna. Treatment requires addressing the bony prominence and restoring extension via tendon transfer.

Question 65

A patient presents with intrinsic muscle weakness, clawing of the ring and small fingers, and isolated sensory loss over the volar aspect of the little finger and the ulnar half of the ring finger. Dorsal ulnar sensation is completely intact. Where is the most likely site of ulnar nerve compression?

Explanation

Zone I of Guyon's canal contains both the motor and sensory branches of the ulnar nerve before their bifurcation. Compression here causes motor and volar sensory deficits while sparing the dorsal sensory branch, which branches off proximal to the wrist.

Question 66

A 30-year-old mechanic presents with an exquisitely painful, swollen index finger following a puncture wound. Which of the following clinical signs (Kanavel's signs) is considered the latest and most reliable indicator of pyogenic flexor tenosynovitis?

Explanation

Pain with passive extension is typically the most reliable and exquisitely sensitive sign of pyogenic flexor tenosynovitis. The four Kanavel signs are fusiform swelling, flexed posture, tenderness along the flexor sheath, and pain on passive extension.

Question 67

A 25-year-old male falls on an outstretched hand. Lateral wrist radiographs show the lunate displaced volarly with a "spilled teacup" appearance, while the capitate remains coaxially aligned with the distal radius. This represents which stage of Mayfield's progressive perilunate instability?

Explanation

Mayfield Stage IV instability involves complete dislocation of the lunate volarly (the "spilled teacup" sign) while the capitate reduces dorsally to align with the radius. Stages I-III represent progressive ligamentous disruptions around the lunate without full lunate enucleation.

Question 68

During a complex flexor tendon reconstruction in Zone II, the surgeon must prioritize preserving or reconstructing specific pulleys to prevent bowstringing and maintain digital kinematics. Which two pulleys are the most critical biomechanically?

Explanation

The A2 and A4 pulleys are the most crucial annular pulleys for preventing bowstringing and maintaining the functional excursion of the flexor tendons. They have broad osseous insertions onto the proximal and middle phalanges, respectively.

Question 69

A 28-year-old carpenter presents with dorsal wrist pain and grip weakness. Radiographs reveal sclerosis and early fragmentation of the lunate with an ulnar variance of -3 mm. There is no fixed carpal collapse or secondary arthritis. What is the most appropriate surgical intervention?

Explanation

Radial shortening osteotomy is the gold standard for Lichtman Stage II or IIIa Kienbock's disease in patients with ulnar negative variance. It unloads the avascular lunate by shifting forces to the ulnocarpal articulation.

Question 70

A 22-year-old rugby player felt a "pop" in his ring finger while grabbing an opponent's jersey and cannot actively flex the distal interphalangeal (DIP) joint. Radiographs show a small bony avulsion fragment localized at the level of the proximal interphalangeal (PIP) joint. According to the Leddy and Packer classification, what type of injury is this?

Explanation

A Leddy and Packer Type II injury involves retraction of the flexor digitorum profundus (FDP) tendon to the level of the PIP joint, often associated with a small avulsed bony fragment. The long vincula remain intact, preserving some blood supply and preventing retraction into the palm.

Question 71

A 32-year-old male presents with a high radial nerve palsy following a humeral shaft fracture 8 months ago. He has no clinically detectable nerve recovery. For restoration of wrist extension, finger extension, and thumb extension, which set of tendon transfers represents the classic Brand transfer?

Explanation

The classic Brand tendon transfer for high radial nerve palsy utilizes the pronator teres for wrist extension (ECRB), the flexor carpi radialis for finger extension (EDC), and the palmaris longus for thumb extension (EPL). Transferring to the ECRB rather than the ECRL prevents an unacceptable radial deviation during wrist extension.

Question 72

A 62-year-old female with severe rheumatoid arthritis presents with an inability to actively extend her ring and small fingers at the metacarpophalangeal joints. She has full passive extension and the tenodesis effect is absent. Radiographs show a distally prominent, subluxated ulnar head. What is the most likely diagnosis?

Explanation

Vaughan-Jackson syndrome describes the sequential attrition and rupture of the extensor tendons, typically starting ulnarly with the extensor digiti minimi (EDM). This is caused by friction against a prominent, arthritic distal ulna (caput ulnae syndrome).

Question 73

A 24-year-old male presents with a proximal pole scaphoid nonunion. Which vessel provides the primary retrograde blood supply to the proximal pole of the scaphoid, predisposing this specific fracture location to avascular necrosis?

Explanation

The dorsal carpal branch of the radial artery enters the dorsal ridge of the scaphoid distally and provides retrograde blood flow to the proximal pole. Because of this retrograde supply, proximal pole fractures have a high risk of avascular necrosis and nonunion.

Question 74

A patient complains of an inability to form an "OK" sign, resulting in a flat pinch between the thumb and index finger. Sensation is completely intact globally. Which of the following muscles is typically spared in this specific compression syndrome?

Explanation

Anterior interosseous nerve (AIN) syndrome causes weakness of the flexor pollicis longus, flexor digitorum profundus to the index (and sometimes middle) finger, and pronator quadratus. The pronator teres is innervated by the main trunk of the median nerve proximal to the AIN branching and is spared.

Question 75

A 28-year-old boxer sustains a Bennett fracture-dislocation. The primary deforming force causing proximal and dorsal displacement of the first metacarpal shaft is mediated by which of the following tendons?

Explanation

In a Bennett fracture, the volar ulnar beak fragment remains anatomically held by the anterior oblique ligament. The first metacarpal shaft is pulled proximally, dorsally, and radially primarily by the force of the abductor pollicis longus (APL).

Question 76

A 35-year-old mechanic complains of ulnar-sided wrist pain with a clunking sensation. Lateral radiographs demonstrate a volar intercalated segment instability (VISI) pattern. This deformity is most strongly associated with an acute rupture of which of the following structures?

Explanation

A VISI deformity is characterized by abnormal volar flexion of the lunate. It is most classically associated with disruption of the lunotriquetral (LT) interosseous ligament, which untethers the lunate from the triquetrum, allowing the scaphoid to pull the lunate volarward.

Question 77

A 42-year-old carpenter presents with cold intolerance, pain, and a pulsatile mass over the hypothenar eminence. Angiography reveals a characteristic "corkscrew" appearance of the involved artery. Which anatomical structure is the primary site of arterial injury in this condition?

Explanation

Hypothenar hammer syndrome involves thrombosis or true aneurysm of the ulnar artery. This typically occurs as the artery passes superficially over the hook of the hamate in Guyon's canal, rendering it vulnerable to repetitive blunt trauma.

Question 78

An infant is born with bilateral radial longitudinal deficiency (radial club hands). Which of the following systemic conditions must be urgently evaluated with an echocardiogram to rule out associated, potentially fatal, congenital heart defects?

Explanation

Holt-Oram syndrome is an autosomal dominant condition characterized by upper extremity anomalies, particularly preaxial (radial) deficiencies, and congenital heart defects. An urgent cardiac evaluation is required to rule out atrial or ventricular septal defects.

Question 79

During a trigger finger release of the middle finger, the surgeon must be careful to preserve essential pulleys to prevent bowstringing of the flexor tendons. Which two annular pulleys are critical biomechanical restraints that must be maintained?

Explanation

The A2 pulley (located over the proximal half of the proximal phalanx) and A4 pulley (located over the middle third of the middle phalanx) are the major biomechanical restraints to flexor tendon bowstringing. Trigger finger release exclusively divides the A1 pulley.

Question 80

A 29-year-old presents with a severely swollen, erythematous, and throbbing volar distal pad of the index finger, consistent with a felon. If surgical drainage is performed, which anatomical consideration is crucial regarding the fibrous septa of the retinaculum cutis?

Explanation

A felon is a closed-space infection of the volar fingertip pulp. The pulp is divided into multiple small, discrete compartments by vertical fibrous septa; adequate surgical drainage requires disrupting these septa to fully decompress the purulent material.

Question 81

A 19-year-old gymnast presents with persistent ulnar-sided wrist pain exacerbated by forearm rotation. MRI confirms a Palmer Class 1B tear of the triangular fibrocartilage complex (TFCC). This specific tear pattern involves detachment from which structure?

Explanation

A Palmer Class 1B TFCC tear represents a traumatic avulsion of the TFCC from its peripheral ulnar attachment (fovea or base of the ulnar styloid). Since this peripheral area is well-vascularized, it has excellent healing potential following direct surgical repair.

Question 82

A 25-year-old male sustains a diaphyseal fracture of the radius with associated distal radioulnar joint (DRUJ) dislocation. Following anatomic open reduction and internal fixation of the radius, the DRUJ remains grossly unstable in full supination. What is the most appropriate next step in management?

Explanation

If the DRUJ is irreducible or remains grossly unstable after anatomic radius fixation in a Galeazzi fracture, an open approach to the DRUJ is required. This instability is often due to soft tissue interposition (such as the ECU tendon or capsule) and requires direct TFCC repair.

Question 83

A 45-year-old female presents with severe, lancinating pain in her left ring fingertip, exquisitely sensitive to cold temperatures. Examination reveals point tenderness and a faint bluish discoloration beneath the nail bed. What is the most likely diagnosis?

Explanation

Glomus tumors are benign, neuromyoarterial hamartomas of the glomus body. They classically present with a distinct clinical triad: pinpoint severe pain, hypersensitivity to cold, and a subungual bluish discoloration.

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