Orthopedic Foot Review | Dr Hutaif Foot & Ankle Review - ...

Question 1

A 55-year-old poorly controlled diabetic patient presents with a unilaterally swollen, erythematous, and warm left foot. Dorsalis pedis and posterior tibial pulses are bounding. Radiographs demonstrate periarticular debris, fragmentation, and joint subluxation at the tarsometatarsal joints.

According to the Eichenholtz classification, which stage does this clinical and radiographic picture represent, and what is the primary pathophysiological driver?

Explanation

This patient presents with Stage 1 (Developmental/Fragmentation) Charcot arthropathy, characterized clinically by a red, hot, swollen foot and radiographically by periarticular debris, fragmentation of bone, and subluxation/dislocation. The bounding pulses indicate autonomic neuropathy leading to a loss of sympathetic tone, causing arteriovenous shunting, hyperemia, and active bone resorption (neurovascular theory).

Question 2

A 42-year-old female presents with severe bunion pain. Weight-bearing radiographs reveal a Hallux Valgus Angle (HVA) of 48 degrees and an Intermetatarsal Angle (IMA) of 22 degrees. On physical exam, there is demonstrable hypermobility at the first tarsometatarsal (TMT) joint. Which of the following surgical procedures is most appropriate to correct this deformity?

Explanation

A first TMT arthrodesis (Lapidus procedure) is indicated for severe hallux valgus (IMA > 20 degrees, HVA > 40 degrees), particularly in the presence of first TMT hypermobility or arthritis. A distal chevron osteotomy is for mild deformity. A proximal osteotomy could address a high IMA but does not address TMT hypermobility, leading to a high recurrence rate.

Question 3

In patients with Charcot-Marie-Tooth (CMT) disease, a cavovarus foot deformity progressively develops. The initial driver of this deformity is a specific muscle imbalance. Which of the following correctly describes the predominant muscle imbalances in the classic CMT foot?

Explanation

In CMT, the cavovarus deformity is classically driven by the peroneus longus (which remains strong) overpowering the weak tibialis anterior, leading to plantarflexion of the 1st ray (forefoot valgus). Additionally, the tibialis posterior (strong) overpowers the weak peroneus brevis, driving the hindfoot into varus.

Question 4

A 28-year-old male sustains a high-energy motor vehicle collision resulting in a Hawkins Type III talar neck fracture.

What is the defining anatomical feature of a Hawkins Type III fracture, and what is the approximate risk of avascular necrosis (AVN)?

Explanation

A Hawkins Type III fracture is a displaced talar neck fracture with dislocation of both the subtalar and tibiotalar joints. The risk of AVN is historically reported as nearly 100% due to the disruption of all three major blood supplies to the talar body (artery of the tarsal canal, deltoid branches, and anterior tibial/dorsalis pedis branches). Type IV involves the talonavicular joint as well.

Question 5

A 35-year-old recreational basketball player felt a 'pop' in his heel and presents with a positive Thompson test. He elects for non-operative management of his acute Achilles tendon rupture. Based on recent high-quality randomized controlled trials comparing operative to non-operative treatment with functional rehabilitation, which of the following statements is true?

Explanation

Recent high-level evidence (such as the Willits trial) demonstrates that when dynamic functional rehabilitation protocols are employed, non-operative management of acute Achilles tendon ruptures yields similar functional outcomes and similar re-rupture rates compared to operative management, while entirely avoiding surgical complications such as infection and wound breakdown.

Question 6

Which of the following structures constitutes the primary attachment points for the Lisfranc ligament?

Explanation

The Lisfranc ligament is an interosseous ligament that connects the lateral aspect of the medial cuneiform to the medial aspect of the base of the second metatarsal. It is strongest on the plantar surface. There is no direct ligamentous connection between the bases of the first and second metatarsals.

Question 7

A 50-year-old female presents with progressive medial ankle pain, swelling, and a 'flattening' of her arch. On examination, she is unable to perform a single-leg heel raise on the affected side. Weight-bearing radiographs reveal >40% uncovering of the talar head on the AP view (forefoot abduction). What is the appropriate classification and most comprehensive surgical reconstruction for this patient?

Explanation

This patient has a flexible flatfoot deformity with significant forefoot abduction (>30-40% talonavicular uncoverage), consistent with Stage IIb PTTD. To correct the multiplanar deformity, the standard surgical reconstruction includes a tendon transfer (usually FDL to navicular), a medial displacement calcaneal osteotomy (MDCO) to correct hindfoot valgus, and a lateral column lengthening (e.g., Evans osteotomy) to correct the forefoot abduction.

Question 8

In the setting of a displaced intra-articular calcaneus fracture, one bony fragment typically remains anatomically reduced relative to the talus despite significant comminution elsewhere. Which fragment is this, and what ligamentous structures maintain its alignment?

Explanation

The sustentaculum tali (anteromedial fragment) is known as the 'constant' fragment in calcaneus fractures. It remains tightly bound to the talus by the strong deltoid ligament complex and the interosseous talocalcaneal ligaments, and typically remains in its anatomic position beneath the talus.

Question 9

A 22-year-old collegiate sprinter presents with lateral foot pain. Radiographs reveal a transverse fracture of the fifth metatarsal at the metaphyseal-diaphyseal junction, extending into the fourth-fifth intermetatarsal articulation. What is the most appropriate management for this athlete?

Explanation

This describes a Zone 2 fracture of the fifth metatarsal (Jones fracture). Because this area represents a vascular watershed zone, these fractures have a high rate of delayed union or nonunion. In a high-level athlete, early intramedullary screw fixation is recommended to reduce the risk of nonunion and accelerate return to play.

Question 10

A professional football player sustains a 'turf toe' injury characterized by a complete tear of the plantar plate with proximal retraction of the sesamoids. What is the primary mechanism of injury leading to this specific pathology?

Explanation

Turf toe represents a sprain or tear of the first MTP joint capsuloligamentous complex (plantar plate). The classic mechanism of injury is forced hyperextension of the first MTP joint with an axial load applied to a foot fixed on the playing surface.

Question 11

Following open reduction and internal fixation of an ankle fracture with a concomitant syndesmotic injury, what imaging modality and specific parameter are considered the gold standard for verifying accurate anatomic reduction of the distal tibiofibular syndesmosis?

Explanation

Postoperative axial CT scanning is the most accurate imaging modality for assessing syndesmotic reduction. Plain radiographs have been shown to be notoriously unreliable for detecting syndesmotic malreduction. CT best visualizes anterior-to-posterior translation and rotational alignment of the fibula within the tibial incisura.

Question 12

Osteochondral lesions of the talus (OLT) exhibit distinct characteristics based on their anatomic location on the talar dome. Based on the widely taught mnemonic 'DIAL a PIMP', which of the following descriptions accurately characterizes a posteromedial talar dome lesion?

Explanation

The mnemonic 'DIAL a PIMP' helps distinguish OLTs. 'DIAL' = Dorsiflexion, Inversion, Anterior, Lateral lesions (these are typically shallow, wafer-shaped, and traumatic). 'PIMP' = Plantarflexion, Inversion, Medial, Posterior lesions (these are typically deep, cup-shaped, and often insidious/non-traumatic in origin).

Question 13

A 14-year-old male presents with recurrent ankle sprains and rigid 'spastic' flatfeet. Lateral radiographs demonstrate a 'C-sign'

representing continuity between the talar dome and the sustentaculum tali. Which tarsal coalition does this patient have, and what joint is most directly involved?

Explanation

The 'C-sign' on a lateral radiograph of the foot is highly suggestive of a talocalcaneal coalition. This coalition almost exclusively involves the middle facet of the subtalar joint. It typically presents slightly later (ages 12-16) than calcaneonavicular coalitions (ages 8-12).

Question 14

During surgical decompression for Tarsal Tunnel Syndrome, the surgeon releases the flexor retinaculum. The structures passing through the tarsal tunnel from anterior to posterior (or medial to lateral) follow a specific order. Which of the following correctly identifies the relative anatomical position of the posterior tibial artery?

Explanation

The structures passing through the tarsal tunnel from anterior to posterior (medial malleolus to calcaneus) are: Tibialis posterior tendon, Flexor Digitorum Longus tendon, Posterior tibial Artery, posterior tibial Vein, Tibial Nerve, Flexor Hallucis Longus tendon (Mnemonic: Tom, Dick, And Very Nervous Harry). Therefore, the artery lies between the FDL tendon and the tibial nerve.

Question 15

A 15-year-old female cross-country runner presents with isolated, localized pain over the dorsal aspect of her forefoot. Radiographs reveal flattening and sclerosis of the second metatarsal head. What is the diagnosis and its underlying pathophysiology?

Explanation

Freiberg's infraction is avascular necrosis of the metatarsal head, most commonly affecting the second metatarsal head. It frequently presents in adolescent females who participate in sports or activities that repetitively load the forefoot.

Question 16

A 40-year-old woman complains of burning pain in her forefoot that radiates into her toes, feeling 'like walking on a marble'. A Mulder's click is elicited on examination. If surgical excision of the underlying pathology is performed, histological evaluation of the specimen would most likely show:

Explanation

The clinical presentation describes a Morton's neuroma, most commonly located in the third intermetatarsal space. Histologically, a Morton's neuroma is not a true neoplasm (neuroma) but rather a compressive neuropathy characterized by perineural fibrosis, local vascular proliferation, demyelination, and axonal degeneration.

Question 17

A 25-year-old skier presents after an acute injury feeling a 'snap' behind his lateral malleolus. On examination, the peroneal tendons dislocate anteriorly over the lateral malleolus with resisted dorsiflexion and eversion. Radiographs show a small bony avulsion flake lateral to the distal fibula.

What structure has been compromised?

Explanation

The 'fleck sign' lateral to the distal fibula represents an avulsion of the Superior Peroneal Retinaculum (SPR) from its fibular attachment. Disruption of the SPR allows the peroneal tendons to subluxate or dislocate anteriorly over the lateral malleolus. Treatment often requires deepening of the fibular groove and repair of the SPR.

Question 18

A 60-year-old male with end-stage post-traumatic ankle arthritis undergoes an open ankle arthrodesis.

To optimize postoperative gait and limit compensatory stress on adjacent hindfoot joints, what is the ideal position for fusing the tibiotalar joint?

Explanation

The ideal position for ankle arthrodesis is neutral sagittal alignment (0 degrees dorsiflexion/plantarflexion), 0 to 5 degrees of hindfoot valgus, and 5 to 10 degrees of external rotation (or symmetric to the contralateral limb). Plantarflexion leads to genu recurvatum (back-knee), and varus locks the transverse tarsal joints, accelerating adjacent joint arthritis.

Question 19

A collegiate track athlete presents with insidious onset dorsal midfoot pain. CT scan confirms a non-displaced stress fracture of the navicular. Due to the vascular anatomy of the navicular, which region is most susceptible to delayed union or non-union, thus dictating strict non-weight-bearing management?

Explanation

The central third of the tarsal navicular body is relatively avascular (a watershed zone) because the primary blood supply enters dorsally and plantarly, branching toward the medial and lateral poles but leaving the central zone hypovascular. Stress fractures in this region have a high risk of non-union and require strict non-weight-bearing cast immobilization or surgical fixation.

Question 20

A 65-year-old male presents with severe pain in his first metatarsophalangeal (MTP) joint, constant pain throughout the entire arc of motion, and large dorsal osteophytes. Radiographs confirm end-stage Hallux Rigidus (Coughlin and Shurnas Grade 4). He elects to undergo a first MTP arthrodesis. What is the optimal position for this fusion?

Explanation

The optimal position for a first MTP joint arthrodesis is approximately 10-15 degrees of valgus (to mimic the normal hallux valgus angle and clear the second toe) and 10-15 degrees of dorsiflexion relative to the floor (which translates to about 20-25 degrees of dorsiflexion relative to the first metatarsal shaft). This allows for proper roll-off during the terminal stance phase of the gait cycle.

Question 21

A 25-year-old football player presents with midfoot pain after a hyperplantarflexion injury during a tackle. Weight-bearing radiographs show 2.5 mm widening between the 1st and 2nd metatarsal bases.

What are the exact anatomical attachments of the primary ligamentous structure injured in this condition?

Explanation

The patient has a Lisfranc injury. The Lisfranc ligament is the strongest of the tarsometatarsal ligaments and acts as the primary stabilizer of the 2nd tarsometatarsal joint. It runs obliquely from the plantar-lateral aspect of the medial cuneiform to the plantar-medial base of the 2nd metatarsal. The dorsal ligaments are much weaker, which explains why dorsal dislocation is more common in Lisfranc fracture-dislocations.

Question 22

A 40-year-old marathon runner is diagnosed with non-insertional Achilles tendinopathy. The underlying pathophysiology involves degeneration in a hypovascular zone. What is the typical location of this hypovascular watershed zone?

Explanation

Non-insertional Achilles tendinopathy and acute ruptures most commonly occur in the functional 'watershed' or hypovascular zone, which is located approximately 2 to 6 cm proximal to the insertion on the calcaneus. Blood supply in this region is relatively sparse, predisposing the tendon to microtrauma and impaired healing.

Question 23

A 14-year-old boy with Charcot-Marie-Tooth (CMT) disease presents with bilateral progressive cavovarus foot deformities. A Coleman block test demonstrates that the hindfoot varus corrects to neutral when the first ray is allowed to drop off the block. Which of the following describes the primary pathologic muscle imbalance driving the initial deformity?

Explanation

The classic cavovarus foot deformity in CMT disease is driven by a characteristic pattern of muscle denervation and imbalance. The tibialis anterior and peroneus brevis weaken early. The relative preservation and overpowering force of the peroneus longus (plantarflexing the 1st ray) and tibialis posterior (inverting the hindfoot) drive the plantarflexed first ray and secondary hindfoot varus. A flexible hindfoot (positive Coleman block test) indicates that addressing the forefoot pathology (e.g., via peroneus longus to brevis transfer and 1st metatarsal dorsiflexion osteotomy) may correct the hindfoot without needing an arthrodesis.

Question 24

A 22-year-old professional basketball player suffers an acute, nondisplaced fracture at the metaphyseal-diaphyseal junction of the 5th metatarsal (Zone 2). To minimize the risk of nonunion and expedite return to play, what is the standard of care?

Explanation

This is a Jones fracture (Zone 2 of the 5th metatarsal base). Due to the precarious watershed blood supply to this region, these fractures have a high rate of delayed union or nonunion. In high-level athletes, early operative intervention with an intramedullary solid or cannulated screw is the gold standard to expedite healing and decrease the risk of nonunion or refracture compared to conservative treatment.

Question 25

A 55-year-old woman presents with progressive flattening of her left medial longitudinal arch, medial ankle pain, and an inability to perform a single-leg heel raise. The deformity remains flexible on examination. Which of the following surgical combinations is the most appropriate initial joint-sparing approach?

Explanation

The patient has Stage II Adult Acquired Flatfoot Deformity (Posterior Tibial Tendon Insufficiency). Stage II is characterized by a flexible deformity. Joint-sparing procedures are indicated. The standard of care includes addressing both the soft tissue deficit and the bony malalignment. This is typically achieved with an FDL tendon transfer (to replace the deficient posterior tibial tendon) and a medial displacement calcaneal osteotomy (to correct the valgus hindfoot vector and protect the tendon transfer). Arthrodesis is reserved for rigid deformities (Stage III) or advanced arthritis.

Question 26

A 60-year-old male presents with dorsal midfoot and 1st MTP pain. Radiographs demonstrate moderate dorsal osteophytes of the 1st MTP joint with joint space narrowing affecting less than 50% of the joint. Nonsurgical management has failed. What is the most appropriate surgical intervention?

Explanation

The patient has Grade 2 hallux rigidus (Coughlin and Shurnas classification). Grade 1 and 2 (mild to moderate joint space narrowing, dorsal osteophytes, and pain primarily at the extremes of dorsiflexion) are ideally treated with a cheilectomy (excision of dorsal osteophytes and dorsal third of the metatarsal head) to improve motion and relieve impingement pain. Arthrodesis is the gold standard for Grade 3 (severe narrowing) and Grade 4 (pain in the mid-range of motion).

Question 27

An elite linebacker sustains an extreme hyperextension injury to his great toe. MRI confirms a complete tear of the plantar plate at the 1st MTP joint with proximal retraction of the sesamoid apparatus. What is the most appropriate treatment?

Explanation

This is a Grade III turf toe injury (complete tear of the plantar plate/capsuloligamentous complex) with proximal retraction of the sesamoids. While Grade I and II injuries can often be managed nonoperatively with rest, taping, and stiff-soled inserts, a Grade III injury with frank instability and sesamoid retraction in a high-level athlete typically requires surgical repair to restore the windlass mechanism and push-off strength.

Question 28

A 30-year-old driver is involved in a high-speed motor vehicle collision. Radiographs demonstrate a displaced talar neck fracture with subluxation of the subtalar joint, but the tibiotalar and talonavicular joints remain congruent. According to the Hawkins classification, what is the type of fracture and its associated risk of avascular necrosis (AVN)?

Explanation

Hawkins Type II talar neck fractures involve displacement with subtalar subluxation or dislocation while the tibiotalar and talonavicular joints remain intact. The risk of AVN for Type II fractures is historically quoted as 20% to 50%. Type I is nondisplaced (0-15% AVN risk). Type III involves both subtalar and tibiotalar dislocation (~80-100% AVN risk). Type IV includes subtalar, tibiotalar, and talonavicular dislocation (near 100% AVN risk).

Question 29

When utilizing the extensile lateral approach for open reduction and internal fixation of a displaced intra-articular calcaneus fracture, a full-thickness subperiosteal flap must be developed.

Which nerve is at greatest risk of iatrogenic injury during the creation and retraction of this specific flap?

Explanation

The sural nerve courses along the lateral aspect of the hindfoot, passing posterior and inferior to the lateral malleolus. During the extensile lateral approach to the calcaneus, the sural nerve is at high risk of injury, either from direct laceration or excessive traction. It is typically managed by incorporating it into the full-thickness subperiosteal 'no-touch' flap to protect it during retraction.

Question 30

A 60-year-old male with poorly controlled diabetes mellitus presents with a chronic, draining neuropathic ulcer under the 3rd metatarsal head. A probe easily contacts bone at the base of the ulcer. MRI demonstrates high T2 signal and low T1 signal replacing the marrow fat of the 3rd metatarsal head. What is the single most common causative organism for osteomyelitis in this clinical setting?

Explanation

A positive probe-to-bone test is highly predictive of osteomyelitis in the setting of a diabetic foot ulcer. While diabetic foot infections are frequently polymicrobial (especially chronic or ischemic wounds), Staphylococcus aureus is unequivocally the single most common causative pathogen isolated in diabetic pedal osteomyelitis.

Question 31

A 55-year-old patient with long-standing peripheral neuropathy secondary to diabetes presents with a unilaterally swollen, warm, and erythematous foot and ankle. Radiographs demonstrate dramatic midfoot fragmentation, periarticular debris, and joint subluxation without evidence of ulceration or skin breakdown. According to the Eichenholtz classification of Charcot neuroarthropathy, what stage does this represent?

Explanation

The clinical picture of a warm, swollen foot coupled with radiographic evidence of bone fragmentation, joint subluxation, and debris characterizes Stage I (Developmental or Fragmentation) of the Eichenholtz classification for Charcot neuroarthropathy. Stage 0 features clinical erythema and swelling but normal radiographs. Stage II (Coalescence) shows absorption of fine debris and early fusion. Stage III (Reconstruction) shows rounding of bone ends, sclerosis, and stabilization of deformity.

Question 32

During the standard dorsal surgical approach for the excision of a primary Morton's neuroma located in the 3rd web space, which specific anatomical structure is routinely transected to allow adequate visualization and resection of the neuroma?

Explanation

A Morton's neuroma most commonly occurs in the 3rd intermetatarsal space. It is an entrapment neuropathy of the common digital nerve. The nerve runs plantar to the deep transverse metatarsal ligament. During a dorsal approach, the deep transverse metatarsal ligament must be identified and transected to release the compression, allowing the surgeon to elevate the nerve into the dorsal wound for proximal resection.

Question 33

A 45-year-old female presents with chronic burning pain radiating along the medial heel and plantar aspect of the foot. Tinel's sign is markedly positive when percussing posterior to the medial malleolus. The structures passing through the tarsal tunnel are maintained by the flexor retinaculum. In evaluating this space from anterior to posterior, which structure is the most anterior?

Explanation

Tarsal tunnel syndrome involves entrapment of the tibial nerve under the flexor retinaculum. The structures passing behind the medial malleolus, ordered from anterior to posterior, are remembered by the mnemonic 'Tom, Dick, And Very Nervous Harry': Tibialis posterior tendon, flexor Digitorum longus tendon, posterior tibial Artery, posterior tibial Vein, tibial Nerve, and flexor Hallucis longus tendon. Therefore, the tibialis posterior tendon is the most anterior structure.

Question 34

Following open reduction and internal fixation of an ankle fracture, an intraoperative external rotation stress test indicates widening of the medial clear space and tibiofibular clear space. The surgeon elects to place a syndesmotic screw. Which ligament of the syndesmotic complex provides the greatest mechanical strength and resistance to posterior displacement of the fibula?

Explanation

The syndesmotic complex consists of the AITFL, PITFL, interosseous ligament, and transverse ligament. Biomechanical studies (e.g., Ogilvie-Harris et al.) have demonstrated that the PITFL is the strongest component, providing approximately 42% of the strength of the syndesmosis. The AITFL provides about 35% and is the most commonly injured. The interosseous ligament provides about 22%.

Question 35

A 65-year-old patient presents with end-stage post-traumatic tibiotalar arthritis and is requesting a total ankle arthroplasty (TAA).

Which of the following conditions represents an absolute contraindication to primary total ankle arthroplasty?

Explanation

Absolute contraindications to Total Ankle Arthroplasty (TAA) include active infection, Charcot neuroarthropathy, severe uncorrectable malalignment, inadequate soft tissue envelope, and absent motor function (e.g., flaccid paralysis). Charcot neuroarthropathy, especially with severe deformity and loss of protective sensation, leads to exceptionally high failure rates of the implant. Advanced age and concomitant subtalar arthritis are often considered indications for TAA over arthrodesis.

Question 36

The spring ligament complex is a crucial static stabilizer of the medial longitudinal arch of the foot, preventing pes planus deformity. What are the exact bony attachments of the main component of the spring ligament?

Explanation

The spring ligament is formally known as the plantar calcaneonavicular ligament. It originates on the sustentaculum tali of the calcaneus and inserts onto the plantar-medial aspect of the navicular. It forms a 'sling' supporting the head of the talus, working in concert with the posterior tibial tendon to maintain the medial longitudinal arch.

Question 37

A 35-year-old presents to the ER with lateral foot pain and swelling after an acute inversion injury. On physical examination, maximal point tenderness is localized approximately 1 cm distal and slightly inferior to the lateral malleolus. Radiographs demonstrate an avulsion fracture of the anterior process of the calcaneus. Tension from which ligament is primarily responsible for this specific fracture pattern?

Explanation

Avulsion fractures of the anterior process of the calcaneus typically occur due to an inversion and plantarflexion force placing sudden tension on the bifurcate ligament. The bifurcate ligament connects the anterior process of the calcaneus to the cuboid and the navicular. This injury is often misdiagnosed as a severe lateral ankle sprain (ATFL/CFL injury), but the point of maximal tenderness is more distal.

Question 38

A 28-year-old construction worker sustains a crush injury to the foot. He develops severe, unremitting pain out of proportion to the clinical findings, and pain on passive stretching of the toes. Compartment syndrome of the foot is suspected. According to the standard anatomical description (e.g., Manoli and Weber), how many distinct fascial compartments exist in the foot?

Explanation

The foot contains 9 distinct fascial compartments: medial, lateral, superficial central, calcaneal (deep central), adductor, and four separate interosseous compartments. A thorough fasciotomy for foot compartment syndrome requires releasing all 9 compartments, typically through a dual dorsal approach or a combined medial and dorsal approach.

Question 39

A 20-year-old competitive track athlete complains of an insidious onset of ill-defined dorsal midfoot pain, worse with sprinting.

A CT scan is obtained and confirms a navicular stress fracture. Which anatomic region of the navicular is at the highest risk for stress fractures due to its underlying watershed blood supply?

Explanation

Navicular stress fractures most commonly occur in the central third of the bone. This region represents an avascular 'watershed' zone between the medial blood supply (branches of the posterior tibial and dorsalis pedis arteries) and the lateral supply. The combination of hypovascularity and high repetitive shear stresses makes the central third highly susceptible to delayed union and nonunion if not treated aggressively.

Question 40

A 45-year-old male undergoes surgical treatment for refractory insertional Achilles tendinopathy with a prominent Haglund's deformity. The procedure requires reflection of the Achilles tendon to aggressively resect the retrocalcaneal exostosis and debride the diseased tendon. What is the maximum percentage of the Achilles tendon insertion that can typically be detached and debrided before primary augmentation (such as FHL tendon transfer) becomes biomechanically required?

Explanation

Classic biomechanical and clinical studies dictate that up to 50% of the Achilles tendon insertion can be safely detached and debrided to allow access for an adequate ostectomy without routine need for augmentation with a Flexor Hallucis Longus (FHL) transfer. If more than 50% of the tendon requires detachment or is hopelessly degenerated, an FHL transfer is indicated to restore plantarflexion power and prevent catastrophic postoperative rupture.

Question 41

A 14-year-old boy presents with a painful, rigid flatfoot and a history of recurrent ankle sprains. A lateral radiograph of the foot is obtained, which demonstrates a continuous "C-sign".

Based on the most likely diagnosis, which specific anatomical structure is most commonly involved in this pathology?

Explanation

The patient has a talocalcaneal coalition, indicated by the rigid flatfoot, recurrent ankle sprains, and the classic "C-sign" on the lateral radiograph. The "C-sign" is formed by the medial outline of the talar dome and the posteroinferior outline of the sustentaculum tali, suggesting a bridging between the talus and calcaneus. The middle facet of the subtalar joint is the most common site for a talocalcaneal coalition. Calcaneonavicular coalitions are also common but are typically identified by the "anteater nose" sign on an oblique radiograph.

Question 42

A 32-year-old male sustains a high-energy trauma resulting in an irreducible lateral subtalar dislocation. Attempted closed reduction in the emergency department is unsuccessful. What anatomical structure is most likely acting as the primary block to closed reduction in this specific injury pattern?

Explanation

Subtalar dislocations are classified by the direction of the distal foot relative to the talus. Medial dislocations are the most common (85%). Lateral dislocations (15%) are higher energy and have a higher rate of being irreducible. In a lateral subtalar dislocation, the navicular and calcaneus displace lateral to the talus. The talar head is forced medially, frequently buttonholing through the medial joint capsule and becoming entrapped by the posterior tibial tendon, which represents the most common block to reduction in lateral subtalar dislocations. Conversely, in medial subtalar dislocations, the most common blocks to reduction are the extensor digitorum brevis, the extensor retinaculum, or the talonavicular joint capsule.

Question 43

A 24-year-old athlete sustains a midfoot injury. An AP weight-bearing radiograph demonstrates a "fleck sign" in the first intermetatarsal space.

The primary ligamentous structure avulsed in this injury connects which two osseous structures?

Explanation

The "fleck sign" is pathognomonic for a Lisfranc injury and represents a bony avulsion of the Lisfranc ligament. The Lisfranc ligament is a stout intra-articular ligament that originates from the lateral aspect of the medial cuneiform and inserts onto the medial aspect of the base of the second metatarsal. It is the primary stabilizer of the second tarsometatarsal joint. There is no direct transverse ligamentous connection between the bases of the first and second metatarsals, making the Lisfranc ligament critical for midfoot stability.

Question 44

A 45-year-old runner presents with chronic, severe heel pain that has failed 6 months of conservative management including stretching, orthotics, and corticosteroid injections. He reports a burning sensation radiating to the lateral aspect of the heel. Examination reveals maximal tenderness at the medial aspect of the heel, slightly distal to the calcaneal tuberosity. The clinician suspects entrapment of the first branch of the lateral plantar nerve (Baxter's nerve). Between which two structures does this nerve most commonly become entrapped?

Explanation

Baxter's nerve, the first branch of the lateral plantar nerve, provides motor innervation to the abductor digiti minimi and sensory innervation to the anterior aspect of the calcaneal tuberosity. Entrapment of this nerve is a cause of recalcitrant heel pain (accounting for up to 20% of cases of chronic heel pain). The nerve is most commonly compressed between the deep muscular fascia of the abductor hallucis muscle and the medial plantar margin of the quadratus plantae muscle.

Question 45

A 60-year-old female presents with a progressively worsening "crossover toe" deformity of her second toe. Clinical examination demonstrates dorsal subluxation of the second metatarsophalangeal (MTP) joint and a positive positive Lachman test of the joint. In the context of a plantar plate tear leading to this deformity, which anatomical location of the plantar plate is most frequently torn?

Explanation

A crossover toe deformity is typically the result of an insufficiency or rupture of the plantar plate and lateral collateral ligament of the MTP joint, most commonly affecting the second toe. The plantar plate is the primary static stabilizer against dorsal subluxation of the MTP joint. Anatomically, tears of the plantar plate most frequently occur at its distal insertion onto the plantar base of the proximal phalanx, rather than at its proximal origin on the metatarsal neck or in its mid-substance.

Question 46

A 68-year-old patient with end-stage post-traumatic ankle arthritis is undergoing a tibiotalar arthrodesis. To optimize the patient's postoperative gait kinematics and limit the progression of adjacent joint arthritis, what is the ideal position for ankle arthrodesis?

Explanation

The ideal position for an ankle arthrodesis is critical to ensure a functional gait and to minimize stress on the adjacent joints (subtalar, transverse tarsal, and midfoot joints). The accepted ideal position is neutral dorsiflexion (0 degrees), 0 to 5 degrees of hindfoot valgus, 5 to 10 degrees of external rotation (to match the contralateral side), and slight posterior translation of the talus relative to the tibia to optimize the lever arm of the Achilles tendon.

Question 47

A 28-year-old snowboarder sustained a talar neck fracture. He was treated with open reduction and internal fixation. A radiograph taken 8 weeks postoperatively is shown.

This radiographic finding, known as the Hawkins sign, represents which underlying pathophysiological process?

Explanation

The Hawkins sign is characterized by a subchondral radiolucent band in the dome of the talus, visible on AP or mortise radiographs typically 6 to 8 weeks after a talar neck fracture. This radiolucency represents subchondral osteopenia (bone resorption) due to hyperemia of the talus. The presence of the Hawkins sign is a highly reliable indicator that the talar body retains its vascular supply and that avascular necrosis (AVN) will not occur. An absence of the sign does not guarantee AVN, but its presence is an excellent prognostic indicator.

Question 48

A 55-year-old female presents with Stage IIb Adult Acquired Flatfoot Deformity (Posterior Tibial Tendon Dysfunction). Clinical examination reveals a flexible hindfoot with significant forefoot abduction, and weight-bearing radiographs show >40% uncoverage of the talonavicular joint. Surgical reconstruction is planned, including a lateral column lengthening (Evans procedure). Which of the following is the most recognized long-term complication associated specifically with the Evans lateral column lengthening osteotomy?

Explanation

The Evans lateral column lengthening osteotomy involves placing a bone graft in the anterior process of the calcaneus (about 1-1.5 cm proximal to the calcaneocuboid joint) to correct forefoot abduction in Stage IIb flatfoot deformities. A well-documented biomechanical consequence of lengthening the lateral column is a significant increase in contact pressures across the calcaneocuboid joint. This frequently leads to symptomatic calcaneocuboid joint arthritis postoperatively. To mitigate this risk, some surgeons advocate for a distraction arthrodesis of the calcaneocuboid joint instead.

Question 49

A 19-year-old collegiate basketball player sustains a fracture to the base of the fifth metatarsal. Radiographs demonstrate a transverse fracture located strictly distal to the 4th/5th intermetatarsal articulation, extending into the diaphysis. Intramedullary screw fixation is elected. Which of the following technical errors during screw insertion is most likely to result in medial gapping and subsequent nonunion of this specific fracture pattern?

Explanation

The fracture described is a Zone 3 diaphyseal stress fracture of the fifth metatarsal. The fifth metatarsal shaft normally has a natural lateral bow. When utilizing intramedullary screw fixation, if a screw is selected that is too long and straight, it will not conform to the metatarsal's bow. As the screw is advanced, it effectively straightens the bone, which causes distraction and "gapping" at the medial cortex of the fracture site. Medial gapping in an area with a tenuous watershed blood supply drastically increases the risk of delayed union or nonunion.

Question 50

A 50-year-old man undergoes surgical reconstruction for severe insertional Achilles tendinopathy with a large Haglund's deformity. Intraoperatively, extensive tendinosis is noted, requiring debridement of 60% of the Achilles tendon insertion. The surgeon elects to augment the repair with a Flexor Hallucis Longus (FHL) tendon transfer. Which of the following represents the most compelling biomechanical rationale for choosing the FHL over the Flexor Digitorum Longus (FDL) for Achilles augmentation?

Explanation

When more than 50% of the Achilles tendon is debrided at its insertion, augmentation is typically recommended to prevent rupture and restore strength. The Flexor Hallucis Longus (FHL) is the preferred tendon for transfer. The primary rationale is that the FHL is significantly stronger than the FDL (approximately twice the cross-sectional area and tensile strength), its axis of contraction closely parallels the Achilles tendon, and it fires in the same phase of the gait cycle (terminal stance) as the triceps surae, making it an excellent synergistic substitute.

Question 51

A 22-year-old patient with Charcot-Marie-Tooth disease presents with a bilateral cavovarus foot deformity. The clinician performs the Coleman block test. During the test, the patient's heel varus completely corrects to neutral when the lateral aspect of the foot is supported on a 1-inch block and the first ray is allowed to drop off the block into plantarflexion. What does this specific physical examination finding indicate, and what is the appropriate targeted bony correction?

Explanation

The Coleman block test distinguishes a flexible, forefoot-driven hindfoot varus from a rigid, fixed hindfoot varus. By allowing the plantarflexed first ray to drop off the block, the test eliminates the tripod effect created by the rigid plantarflexed first metatarsal pushing against the ground and forcing the hindfoot into varus. If the hindfoot varus corrects to neutral when the first ray drops, the hindfoot is flexible, and the primary driver of the varus deformity is the plantarflexed first ray. The appropriate primary bony intervention is a dorsiflexion osteotomy of the first metatarsal (e.g., modified Jones osteotomy or first tarsometatarsal arthrodesis).

Question 52

A 26-year-old male presents with chronic deep ankle pain following an inversion injury 2 years ago. MRI reveals an osteochondral lesion of the medial talar dome. The lesion measures 1.8 cm^2 and is accompanied by a 12 mm deep subchondral cyst. Non-operative management has failed. According to current evidence-based algorithms, what is the most appropriate surgical intervention?

Explanation

The treatment algorithm for osteochondral lesions of the talus (OLT) depends heavily on the size of the lesion and the presence of underlying cystic changes. Arthroscopic bone marrow stimulation (microfracture) is highly effective for primary lesions smaller than 1.5 cm^2 without massive cystic change. However, for large lesions (> 1.5 cm^2) and those with significant subchondral cysts, microfracture has a high failure rate. In these cases, structural restoration is required using an Osteochondral Autograft Transfer System (OATS) or regenerative techniques like Autologous Chondrocyte Implantation (ACI).

Question 53

A 16-year-old female presents with a progressive, symptomatic hallux valgus deformity.

Weight-bearing radiographs demonstrate an intermetatarsal angle of 15 degrees and a Distal Metatarsal Articular Angle (DMAA) of 25 degrees. The MTP joint is congruent. If a simple proximal crescentic osteotomy or a standard shaft osteotomy is performed to correct the intermetatarsal angle without addressing the DMAA, what is the most likely biomechanical consequence?

Explanation

Juvenile hallux valgus frequently presents with a normal first MTP joint congruency but an abnormally high Distal Metatarsal Articular Angle (DMAA) (normal < 10 degrees). The DMAA represents the orientation of the articular cartilage relative to the longitudinal axis of the metatarsal. If a surgeon corrects the intermetatarsal angle using a standard proximal or midshaft osteotomy without correcting the DMAA, the articular surface will be tilted laterally, rotating the previously congruent joint into an incongruent position. This obligate joint incongruency biomechanically drives rapid recurrence of the hallux valgus deformity. A double osteotomy (proximal + distal biplanar/Reverdin) is typically required to correct both the IM angle and the DMAA.

Question 54

A 40-year-old construction worker sustained a highly comminuted, displaced intra-articular calcaneus fracture (Sanders Type IIIAB). An open reduction and internal fixation utilizing an extensile lateral approach is planned. To minimize the risk of lateral wound flap necrosis, the surgeon must carefully preserve the primary arterial supply to the full-thickness lateral flap. Which artery provides this critical angiosome?

Explanation

The extensile lateral approach to the calcaneus involves raising a full-thickness "L-shaped" soft tissue flap down to the periosteum. The blood supply to this lateral calcaneal flap is uniquely tenuous and depends almost entirely on the lateral calcaneal artery, which is a terminal branch of the peroneal artery. Violating this angiosome by making the vertical limb of the incision too posterior or raising a "split-thickness" flap significantly increases the risk of wound edge necrosis and subsequent deep infection.

Question 55

Diabetic Charcot neuroarthropathy can present insidiously or as an acute, hot, swollen foot that mimics infection. According to the Brodsky anatomical classification of Charcot arthropathy, which joint complex represents the most frequent site of involvement (Type 1)?

Explanation

The Brodsky classification categorizes Charcot neuroarthropathy based on anatomical location. Type 1 involves the midfoot (tarsometatarsal/Lisfranc and naviculocuneiform joints) and is by far the most common, accounting for approximately 60% of cases. It classically leads to midfoot collapse and a "rocker-bottom" deformity. Type 2 involves the hindfoot (subtalar, talonavicular, calcaneocuboid). Type 3A involves the ankle joint. Type 3B involves the calcaneal tuberosity.

Question 56

A professional American football player sustains a hyperextension injury to his first metatarsophalangeal (MTP) joint, diagnosed as a severe "Turf Toe" (Grade 3). Which of the following combinations of clinical and radiographic findings serves as an absolute indication for acute surgical repair of the plantar plate in this athlete?

Explanation

A Grade 3 Turf Toe injury represents a complete tear of the plantar plate-sesamoid complex from the base of the proximal phalanx. While many can be managed conservatively in a boot or cast, surgical intervention is indicated for high-level athletes if there is frank instability. Absolute indications for surgery include: large intra-articular fracture of a sesamoid, proximal retraction of the sesamoids > 3 mm (indicating complete gross rupture of the complex), traumatic hallux valgus (indicating tearing of the medial restraints allowing lateral subluxation), or vertical instability of the joint.

Question 57

A 21-year-old track athlete presents with an 8-week history of vague, cramping midfoot pain exacerbated by sprinting. Clinical exam shows localized tenderness over the dorsum of the midfoot. Plain radiographs are negative. A CT scan confirms a dorsal cortical fracture line in the navicular, extending into the central third of the bone, with surrounding sclerosis. What anatomical vascular feature is primarily responsible for the high risk of nonunion in this specific fracture?

Explanation

Navicular stress fractures typically occur in young running or jumping athletes and have a notoriously high rate of delayed union or nonunion. This is anatomically dictated by its blood supply. The navicular receives blood primarily from branches of the dorsalis pedis (dorsal) and medial plantar arteries (plantar). These vessels supply the medial and lateral poles, leaving the central third of the navicular as a relatively avascular "watershed" zone. Stress fractures overwhelmingly occur in this central third, making them prone to nonunion and often requiring surgical intervention (screws +/- graft) if there is a complete fracture, a cortical break, or sclerosis.

Question 58

A 55-year-old man undergoes endoscopic plantar fasciotomy for recalcitrant plantar fasciitis. Postoperatively, his original heel pain resolves, but three months later he develops new-onset, severe, aching pain along the lateral border of his midfoot, particularly over the calcaneocuboid joint, and a noticeable flattening of his medial longitudinal arch. What technical error during the surgery most likely precipitated this new pathology?

Explanation

Plantar fasciotomy involves releasing the medial and central bands of the plantar fascia. Current recommendations stress releasing only the medial 30% to 50% of the fascia. Complete or excessive release (>50%) drastically reduces the tension-band effect of the plantar fascia, leading to a loss of the medial longitudinal arch, increased strain on the spring ligament, and lateral column overload. This biomechanical shift causes severe lateral midfoot pain, often localized to the calcaneocuboid joint, which is a classic and difficult-to-treat complication of over-aggressive plantar fascia release.

Question 59

A 60-year-old female presents with Hallux Rigidus. She reports moderate pain mostly at the extremes of dorsiflexion, which restricts her ability to wear high-heeled shoes. Clinical examination reveals a palpable dorsal osteophyte and 30 degrees of dorsiflexion. Radiographs demonstrate dorsal joint space narrowing with preservation of the plantar joint space (Coughlin and Shurnas Grade 2). The patient fails non-operative management. When performing the indicated cheilectomy, how much of the dorsal aspect of the metatarsal head should typically be resected to restore adequate dorsiflexion and relieve impingement?

Explanation

Cheilectomy is indicated for early to moderate Hallux Rigidus (Coughlin and Shurnas Grades 1 and 2, and selectively Grade 3 where pain is present only at extremes of motion and not at mid-arc). The procedure involves resecting the dorsal osteophytes and the diseased dorsal articular cartilage. To adequately decompress the joint, eliminate dorsal impingement, and improve dorsiflexion, the literature dictates that approximately 25% to 30% of the dorsal aspect of the first metatarsal head should be resected. Resecting more risks joint instability or stiffness, while resecting less leads to inadequate pain relief and restricted motion.

Question 60

A 35-year-old male sustains a purely ligamentous Lisfranc injury. After a thorough discussion, he is randomized in a clinical trial comparing Open Reduction Internal Fixation (ORIF) with transarticular screws versus Primary Arthrodesis. Based on the landmark prospective randomized study by Ly and Coetzee, what outcome is most likely to be expected if the patient undergoes Primary Arthrodesis rather than ORIF?

Explanation

The treatment of Lisfranc injuries remains debated, but high-level evidence exists for specific subsets. The landmark prospective randomized trial by Ly and Coetzee (JBJS 2006) specifically evaluated primary arthrodesis versus ORIF for primarily ligamentous Lisfranc injuries. They found that primary arthrodesis of the first, second, and third tarsometatarsal joints yielded superior functional outcomes (AOFAS scores) and had a significantly lower reoperation rate (fewer planned hardware removals and fewer conversions to fusion for late arthritis) compared to ORIF. While bony Lisfranc fracture-dislocations may still be treated with ORIF, purely ligamentous injuries are increasingly treated with primary fusion due to this evidence.

Question 61

Anterolateral osteochondral lesions of the talus (OCLT) are typically caused by a specific injury mechanism and present with a distinct morphological appearance compared to posteromedial lesions. Which of the following correctly pairs the mechanism of injury with the classic morphology of an anterolateral OCLT?

Explanation

The mnemonic 'DIAL a PIMP' is used to remember the mechanism and location of osteochondral lesions of the talus. Dorsiflexion Inversion = AnteroLateral (DIAL); Plantarflexion Inversion = PosteroMedial (PIMP). Anterolateral lesions are typically traumatic, shallow, and wafer-shaped. Posteromedial lesions are often atraumatic or insidious, deeper, and cup-shaped.

Question 62

A 32-year-old male sustains a closed talar neck fracture following a motor vehicle collision and undergoes open reduction and internal fixation. At his 8-week postoperative visit, a radiograph demonstrates a subchondral lucent band in the talar dome.

What does this radiographic finding indicate?

Explanation

The subchondral lucency shown is known as Hawkins' sign. It is a radiographic indicator of intact vascularity to the talar body. It represents subchondral osteopenia secondary to hyperemia associated with fracture healing. If the bone were avascular, it would not undergo this resorption and would remain radiodense relative to the surrounding osteopenic bone.

Question 63

A 25-year-old professional football player sustains an acute hyperdorsiflexion injury to his first metatarsophalangeal (MTP) joint, resulting in a 'turf toe'. Magnetic resonance imaging confirms a complete tear of the plantar plate with 4 mm of proximal sesamoid retraction. What is the most appropriate management?

Explanation

A complete tear of the plantar plate (Grade 3 turf toe injury) with significant sesamoid retraction (typically >3 mm), vertical instability, intra-articular fracture, or traumatic hallux valgus are indications for surgical repair in high-level athletes to restore the push-off strength and joint stability.

Question 64

During surgical management of severe insertional Achilles tendinopathy, extensive debridement of the Achilles tendon is performed. At what threshold of Achilles tendon detachment/debridement is a Flexor Hallucis Longus (FHL) tendon transfer classically indicated?

Explanation

If more than 50% of the Achilles tendon insertion requires detachment or debridement during surgery for insertional Achilles tendinopathy, the remaining tendon is generally considered insufficient, and an FHL tendon transfer is indicated to provide adequate plantarflexion strength.

Question 65

A patient undergoes an isolated surgical excision of the fibular (lateral) sesamoid due to a chronic, non-healing fracture. Which of the following deformities is the most recognized complication of this specific procedure?

Explanation

Excision of the fibular (lateral) sesamoid compromises the insertion of the adductor hallucis and the lateral head of the flexor hallucis brevis. This creates an imbalance of dynamic forces at the MTP joint, with unopposed pull from the abductor hallucis leading to a hallux varus deformity. Conversely, medial sesamoid excision risks hallux valgus.

Question 66

A 55-year-old female undergoes a Weil osteotomy for intractable central metatarsalgia. Postoperatively, she complains that her toe does not touch the ground when she stands barefoot. What is the pathomechanism of this specific complication?

Explanation

The most common complication of a Weil osteotomy (distal oblique sliding osteotomy of the metatarsal neck) is a 'floating toe'. This occurs because the plantar translation of the metatarsal head during the osteotomy relatively shifts the axis of the interosseous muscles dorsal to the center of rotation of the MTP joint. As a result, the intrinsics act as extensors rather than flexors of the MTP joint.

Question 67

A 14-year-old female gymnast presents with progressive forefoot pain. Radiographs reveal flattening, sclerosis, and fragmentation of the second metatarsal head.

Based on the most likely diagnosis, what is the initial appropriate management?

Explanation

The clinical and radiographic presentation is classic for Freiberg's infraction, an osteochondrosis (avascular necrosis) most commonly affecting the second metatarsal head. Initial management is nonoperative, focusing on offloading the joint with activity modification, a metatarsal pad, and rigid-soled shoes or a walking boot. Surgical intervention is reserved for refractory cases.

Question 68

During dorsal surgical excision of a Morton's neuroma in the third webspace, which anatomic structure must be incised to adequately expose and mobilize the neuroma?

Explanation

Morton's neuroma is a compressive neuropathy of the common digital nerve. The nerve lies plantar to the deep transverse metatarsal ligament. When approached dorsally, the deep transverse metatarsal ligament must be transected to decompress the area and gain adequate exposure to resect the nerve proximally.

Question 69

When performing a surgical release for Tarsal Tunnel Syndrome, the flexor retinaculum is divided. Which of the following structures lies most posterior and lateral within the tarsal tunnel?

Explanation

The contents of the tarsal tunnel from anterior/medial to posterior/lateral are: Tibialis posterior tendon, Flexor digitorum longus tendon, posterior tibial Artery, posterior tibial Vein, tibial Nerve, and Flexor hallucis longus tendon (FHL). This is remembered by the mnemonic 'Tom, Dick, AND Very Nervous Harry'. The FHL is the most posterior/lateral structure.

Question 70

A 22-year-old skier presents with lateral ankle pain and a popping sensation behind the lateral malleolus when actively dorsiflexing and everting the foot against resistance. Which structure is the primary restraint to this specific pathomechanism?

Explanation

The patient has recurrent peroneal tendon subluxation. The primary restraint to the subluxation of the peroneal tendons out of the retromalleolar groove is the Superior Peroneal Retinaculum (SPR). Treatment for chronic subluxation typically involves SPR repair/reconstruction, often combined with groove deepening.

Question 71

A 68-year-old man presents with a painless "slapping gait" and weakness in ankle dorsiflexion. On examination, he compensates by hyperextending his big toe during the swing phase, and his ability to evert the foot is preserved. Which tendon is most likely ruptured?

Explanation

A spontaneous rupture of the tibialis anterior tendon classically presents in older males with a painless 'foot drop' or slapping gait. Because the extensor hallucis longus (EHL) is intact, the patient will recruit the EHL to assist with dorsiflexion, leading to clawing of the hallux. Eversion is preserved because the peroneal tendons are unaffected.

Question 72

A 20-year-old classical ballet dancer complains of posterior ankle pain that is exacerbated when dancing 'en pointe'. Physical examination reveals tenderness posteromedially and triggering of the hallux with active plantarflexion. Which of the following conditions is most likely responsible?

Explanation

Flexor hallucis longus (FHL) tendinopathy, also known as 'dancer's tendinitis', occurs due to repetitive extreme plantarflexion (en pointe). It often presents with posteromedial ankle pain and triggering of the FHL tendon as it passes through the fibro-osseous tunnel posterior to the medial malleolus, often exacerbated by an os trigonum.

Question 73

A 58-year-old poorly controlled diabetic patient presents with a swollen, warm, erythematous foot but denies any pain. Pulses are palpable. Radiographs are obtained.

The image demonstrates extensive periarticular bone debris, joint subluxation, and fragmentation of the midfoot. According to the modified Eichenholtz classification, what stage of Charcot neuroarthropathy does this represent?

Explanation

The clinical and radiographic description corresponds to Eichenholtz Stage 1 (Developmental/Fragmentation). Characteristics include joint effusion, soft tissue swelling, osteopenia, fragmentation of articular cartilage and subchondral bone, and debris formation. Stage 0 is clinical inflammation with normal radiographs. Stage 2 shows absorption of debris and early fusion. Stage 3 shows bone remodeling and consolidation.

Question 74

When evaluating a patient with a cavovarus foot deformity, a Coleman block test is performed. The patient's heel is placed on a block while the first ray is allowed to drop off the medial edge. During this maneuver, the hindfoot varus deformity completely corrects to a neutral alignment. What does this physical examination finding dictate?

Explanation

The Coleman block test is used to evaluate hindfoot flexibility in a cavovarus foot. By allowing the first ray to hang off the block, it eliminates the contribution of a plantarflexed first ray to the hindfoot alignment. If the hindfoot varus corrects to neutral, the varus is flexible and driven by the forefoot (plantarflexed 1st ray). Treatment can then primarily target the forefoot (e.g., dorsiflexion osteotomy of the 1st metatarsal) without necessarily requiring corrective bony hindfoot surgery.

Question 75

A 35-year-old landscaper accidentally steps on a nail that completely penetrates through the sole of his athletic rubber-soled sneaker into his foot. He presents two weeks later with signs of osteomyelitis. What is the most likely causative organism specific to this mechanism?

Explanation

While Staphylococcus aureus is the most common cause of osteomyelitis overall, puncture wounds through the rubber sole of an athletic shoe carry a unique and highly classic risk for Pseudomonas aeruginosa osteomyelitis. The rubber sole creates an optimal environment for Pseudomonas colonization.

Question 76

During the extensile lateral approach to the calcaneus for open reduction and internal fixation of a joint-depressed calcaneus fracture, a full-thickness soft tissue flap is elevated. Which of the following arteries provides the primary vascular supply to the apex of this specific flap?

Explanation

The viability of the full-thickness flap used in the extensile lateral approach to the calcaneus is primarily dependent on the lateral calcaneal artery, a terminal branch of the peroneal artery. The horizontal limb of the incision must be placed carefully, usually in line with the base of the 5th metatarsal, to preserve the vascularity of the corner.

Question 77

Based on recent Level 1 evidence, when comparing surgical repair with modern functional non-operative management (early weight-bearing and functional bracing) for acute Achilles tendon ruptures, which of the following outcomes is true?

Explanation

Recent Level 1 evidence (e.g., Willits et al., Soroceanu et al.) demonstrates that when modern functional rehabilitation protocols (early weight-bearing and ROM) are employed, the re-rupture rates between non-operative and operative management are statistically equivalent. However, operative management carries a higher risk of soft-tissue and wound complications.

Question 78

A 12-year-old boy presents with recurrent ankle sprains and a rigid, painful flatfoot. Oblique radiographs demonstrate an osseous connection between the anterior process of the calcaneus and the navicular.

Which classic radiographic sign would most likely be visible on the lateral radiograph in this specific condition?

Explanation

The clinical scenario and images describe a calcaneonavicular coalition. On a lateral radiograph, the classic finding is the 'anteater nose sign', which represents the elongated anterior process of the calcaneus attempting to bridge to the navicular. The 'C-sign' and 'talar beak' are classically associated with talocalcaneal (subtalar) coalitions.

Question 79

A 45-year-old runner with chronic heel pain is diagnosed with recalcitrant plantar fasciitis. MRI reveals edema not only at the plantar fascia origin but also within the abductor digiti minimi muscle, suggesting entrapment of Baxter's nerve. Baxter's nerve is a branch of which of the following?

Explanation

Baxter's nerve is the first branch of the lateral plantar nerve. It courses between the abductor hallucis and the quadratus plantae, then turns laterally to innervate the abductor digiti minimi. Entrapment can mimic or occur concomitantly with chronic plantar fasciitis.

Question 80

During clinical examination of a patient with an acquired flatfoot deformity, the examiner evaluates ankle dorsiflexion. With the knee fully extended, ankle dorsiflexion is limited to 0 degrees. When the knee is flexed to 90 degrees, ankle dorsiflexion improves to 15 degrees. What does this test indicate?

Explanation

This is the Silfverskiöld test. The gastrocnemius muscle crosses both the knee and the ankle joints, while the soleus only crosses the ankle. If ankle dorsiflexion improves when the knee is flexed (relaxing the gastrocnemius), the contracture is isolated to the gastrocnemius. If dorsiflexion does not improve with knee flexion, the contracture involves the combined gastrocnemius-soleus complex.

Question 81

A 24-year-old professional rugby player sustains a twisting injury to his midfoot. Radiographs are negative for fractures, but weight-bearing views show a 3 mm diastasis between the bases of the 1st and 2nd metatarsals. An MRI confirms a purely ligamentous Lisfranc injury. What is the most appropriate surgical management to maximize his functional outcome and return to play?

Explanation

Current evidence suggests that primary arthrodesis yields superior functional outcomes and lower reoperation rates compared to ORIF for purely ligamentous Lisfranc injuries. ORIF is generally preferred for purely bony variants.

Question 82

A 35-year-old male presents with a displaced talar neck fracture following a motor vehicle collision. Radiographs demonstrate subluxation of the subtalar joint with an intact ankle joint (Hawkins Type II). At the 8-week postoperative follow-up, an AP radiograph of the ankle reveals a subchondral radiolucent band in the talar dome. What does this radiographic finding indicate?

Explanation

The Hawkins sign is a subchondral radiolucent band seen at 6 to 8 weeks post-injury, representing subchondral osteopenia secondary to hyperemia. Its presence is a reliable indicator that the vascular supply to the talar body is intact, ruling out AVN.

Question 83

A 55-year-old female presents with a progressive flatfoot deformity, lateral hindfoot pain, and inability to perform a single-leg heel raise. Weight-bearing radiographs show talonavicular uncoverage of 45%. Clinical exam reveals severe forefoot abduction (too-many-toes sign) and a flexible hindfoot (Stage IIb Adult Acquired Flatfoot). Which of the following surgical combinations is most appropriate?

Explanation

Stage IIb posterior tibial tendon dysfunction (PTTD) is characterized by significant forefoot abduction (>30-40% talonavicular uncoverage). This requires a lateral column lengthening (e.g., Evans osteotomy) in addition to FDL transfer and MDCO to correct the triplanar deformity.

Question 84

A 62-year-old man presents with severe pain and stiffness in his right great toe. On exam, he has pain throughout the entire range of motion of the 1st metatarsophalangeal (MTP) joint, including the mid-arc. Radiographs reveal near-complete joint space loss, prominent dorsal osteophytes, and subchondral sclerosis. Based on the Coughlin and Shurnas classification, what is the gold standard surgical treatment?

Explanation

This patient has Grade 4 hallux rigidus, defined by pain throughout the range of motion including the mid-arc. First MTP joint arthrodesis is the gold standard for end-stage hallux rigidus, providing reliable pain relief and functional improvement.

Question 85

A 21-year-old collegiate basketball player sustains an inversion injury to his foot and is diagnosed with an acute fracture at the metaphyseal-diaphyseal junction of the 5th metatarsal (Zone 2). To expedite his return to sports and minimize the risk of nonunion, what is the recommended treatment?

Explanation

Zone 2 fractures (Jones fractures) occur in a vascular watershed area with a high risk of nonunion. In high-level athletes, early intramedullary screw fixation is recommended to reduce nonunion rates and expedite return to play.

Question 86

A 40-year-old recreational athlete sustains an acute Achilles tendon rupture. He is evaluating his treatment options. According to recent high-quality randomized controlled trials comparing operative repair to nonoperative management with an early functional rehabilitation protocol, what is the expected outcome regarding re-rupture rates?

Explanation

Recent Level I evidence shows that when an early functional rehabilitation protocol (early weight-bearing and mobilization) is utilized, the re-rupture rates between nonoperative and operative management of Achilles tendon ruptures are statistically similar, while nonoperative treatment avoids surgical complications.

Question 87

A 38-year-old roofer falls 15 feet, sustaining a Sanders Type III intra-articular calcaneus fracture.

An extensile lateral approach is planned for open reduction and internal fixation. To prevent full-thickness flap necrosis, the surgeon must carefully protect the primary blood supply to the corner of this flap. Which vessel is most critical?

Explanation

The extensile lateral approach to the calcaneus relies on a full-thickness subperiosteal flap. The critical blood supply to the apex of this flap is the lateral calcaneal artery, a branch of the peroneal artery.

Question 88

A 22-year-old football lineman presents with severe pain at the 1st MTP joint after another player fell on the back of his heel while his foot was planted and dorsiflexed. MRI reveals a complete rupture of the plantar plate with proximal retraction of the sesamoids by 10 mm. What is the most appropriate management for this Grade 3 Turf Toe injury?

Explanation

Grade 3 turf toe injuries involve a complete tear of the plantar plate complex with sesamoid retraction. Surgical repair is indicated in high-level athletes to restore push-off strength and prevent progressive hallux valgus or rigidus deformities.

Question 89

A 28-year-old skier presents with lateral ankle pain and a popping sensation behind the lateral malleolus after catching an edge. On examination, the peroneal tendons can be subluxated anteriorly over the fibula with resisted dorsiflexion and eversion. What is the classic mechanism of injury for this condition?

Explanation

Acute superior peroneal retinaculum (SPR) tears typically occur due to sudden forced dorsiflexion of an inverted foot. This triggers a violent reflex contraction of the peroneal muscles, avulsing or tearing the SPR and allowing the tendons to subluxate.

Question 90

A 14-year-old male complains of recurrent lateral ankle sprains and a painful, rigid flatfoot.

A lateral radiograph reveals an elongated anterior process of the calcaneus (the "anteater nose" sign). Which type of tarsal coalition does this patient most likely have?

Explanation

The "anteater nose" sign on a lateral radiograph is pathognomonic for a calcaneonavicular coalition, representing a tubular elongation of the anterior process of the calcaneus. Talocalcaneal coalitions are classically associated with the "C-sign".

Question 91

A 45-year-old woman complains of burning pain in the third webspace of her right foot, exacerbated by wearing narrow shoes. On examination, a painful click is elicited when squeezing the metatarsal heads together while applying plantar pressure to the interspace (Mulder's sign). During surgical excision of this presumed neuroma, which ligament must typically be transected to decompress the area?

Explanation

Morton's neuroma is an entrapment neuropathy of the common digital nerve. Surgical excision or decompression requires division of the deep transverse metatarsal ligament, under which the nerve is compressed.

Question 92

Osteochondral lesions of the talus (OCDs) commonly occur following ankle sprains or fractures. According to the "DIAL a PIMP" mnemonic, what is the classic mechanism of injury and morphological characteristic of a posteromedial talar dome lesion?

Explanation

The mnemonic 'DIAL a PIMP' stands for Dorsiflexion Inversion AnteroLateral (shallow/wafer lesions) and Plantarflexion Inversion PosteroMedial (deep/cup-shaped lesions). Posteromedial lesions are more common and less likely to spontaneously displace.

Question 93

A 60-year-old patient with long-standing, poorly controlled diabetes presents with a deep, foul-smelling ulcer under the first metatarsal head that probes to bone. What is the most expected microbiologic profile of this chronic, limb-threatening deep foot infection?

Explanation

Chronic, deep diabetic foot infections, particularly those with necrosis or foul odor, are notoriously polymicrobial. They typically involve a combination of aerobic Gram-positive organisms (like S. aureus), Gram-negative bacilli, and obligate anaerobes.

Question 94

A 23-year-old track athlete presents with insidious onset, vague midfoot pain that worsens with sprinting.

MRI reveals a stress fracture in the central third of the tarsal navicular. Why is conservative management with non-weight-bearing cast immobilization strictly required, and what dictates the high risk of nonunion in this specific area?

Explanation

The central third of the tarsal navicular is a vascular watershed zone, receiving limited blood supply compared to the medial and lateral poles. This anatomic avascularity makes stress fractures here highly prone to delayed union or nonunion.

Question 95

During the correction of idiopathic clubfoot using the Ponseti method, manipulation and casting must follow a specific sequence. Which component of the deformity is corrected first, and what is the maneuver used to achieve it?

Explanation

The Ponseti method corrects deformities in the order of CAVE (Cavus, Adductus, Varus, Equinus). The cavus is corrected first by supinating the forefoot (elevating the first ray) to align it with the already supinated hindfoot.

Question 96

A 58-year-old diabetic patient presents with a swollen, red, and warm foot.

Radiographs show no fractures but severe osteopenia. To differentiate clinically between an acute Charcot neuroarthropathy and cellulitis/osteomyelitis, the physician performs the leg elevation test. What is the expected result if the diagnosis is acute Charcot?

Explanation

The elevation test takes advantage of dependent rubor seen in the autonomic neuropathy of Charcot. Elevating the limb for 5-10 minutes will cause the erythema to dissipate in acute Charcot, whereas erythema from infection will persist.

Question 97

A 65-year-old patient with end-stage post-traumatic ankle arthritis is being evaluated for a Total Ankle Arthroplasty (TAA). Which of the following is considered an absolute contraindication for TAA?

Explanation

Absolute contraindications to Total Ankle Arthroplasty include active infection, severe peripheral neuropathy (Charcot arthropathy), avascular necrosis of >50% of the talar body, and severe uncorrectable malalignment.

Question 98

A 14-year-old female dancer complains of insidious forefoot pain, specifically at the base of the second toe. Radiographs show sclerosis, flattening, and early fragmentation of the second metatarsal head. Which condition is most likely, and what is the underlying pathophysiology?

Explanation

Frieberg's infraction is avascular necrosis of a metatarsal head, most commonly the second. It frequently occurs in adolescent females engaged in activities that repetitively load the forefoot, such as dancing.

Question 99

A 13-year-old boy sustains a severe external rotation ankle injury. Radiographs reveal an isolated Salter-Harris III fracture of the anterolateral aspect of the distal tibial epiphysis (Tillaux fracture). This fracture pattern is uniquely dictated by the asymmetrical closure pattern of the distal tibial physis. Which quadrant of the distal tibial physis is the last to close?

Explanation

The distal tibial physis closes over an 18-month period starting centrally, then anteromedial, posteromedial, and finally anterolateral. Because the anterolateral physis is open last, avulsion by the anterior inferior tibiofibular ligament causes a Tillaux fracture.

Question 100

A patient is evaluated for a suspected acute compartment syndrome of the foot following a severe crush injury. To properly debride and decompress the foot, the surgeon must be aware of the compartmental anatomy. How many discrete fascial compartments are classically described in the foot, and which compartment contains the quadratus plantae muscle?

Explanation

There are classically 9 compartments in the foot: medial, lateral, superficial, calcaneal, adductor, and four interosseous compartments. The calcaneal compartment houses the quadratus plantae muscle and the lateral plantar nerve.

Orthopedic Foot And Ank Review | Dr Hutaif Foot & Ankle -...

Orthopedic Foot Review | Dr Hutaif Foot & Ankle Review - ...

Key Takeaway

Orthopedic Foot Review | Dr Hutaif Foot & Ankle Review - ...

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