Orthopedic Ob Trauma D Review | Dr Hutaif Trauma & Frac -...

Question 1

A 28-year-old male sustains a vertically oriented Pauwels type III femoral neck fracture after a high-energy fall. Which of the following fixation constructs provides the highest biomechanical stability to counteract shear forces for this specific fracture pattern?

Explanation

For vertically oriented femoral neck fractures in young adults (Pauwels III), shear forces are extremely high. A fixed-angle device such as a Dynamic Hip Screw (DHS) with a derotation screw provides superior biomechanical stability compared to multiple cancellous screws, reducing the risk of varus collapse and nonunion. In young adults, head preservation is preferred over arthroplasty.

Question 2

A 45-year-old male is brought to the Emergency Department after a crush injury. He has an anteroposterior compression (APC-III) pelvic ring injury and is hemodynamically unstable. A pelvic binder is applied. Where must the pelvic binder be centered for maximal biomechanical effectiveness?

Explanation

A pelvic binder must be applied centered over the greater trochanters to effectively close the pelvic volume and stabilize the pelvic ring in open book (APC) injuries. Application over the iliac crests or abdomen does not provide the appropriate vectors to close the ring, can paradoxically widen the pelvis, and can limit abdominal access.

Question 3

A 35-year-old male sustains a high-energy Schatzker VI tibial plateau fracture. On examination, he has tense swelling, and his compartment pressures in the anterior compartment measure 40 mmHg with a diastolic blood pressure of 65 mmHg. After performing emergent four-compartment fasciotomies, what is the most appropriate initial management of the fracture?

Explanation

In a high-energy Schatzker VI tibial plateau fracture with compartment syndrome, the standard of care is a staged, damage-control approach. Following fasciotomies, the fracture should be stabilized with a spanning external fixator across the knee to allow soft tissue swelling to resolve before definitive internal fixation, thereby minimizing severe soft tissue complications and infection.

Question 4

A 25-year-old male sustains a Hawkins type III talar neck fracture following an aviation accident. Which of the following accurately describes the displacement and the associated risk of avascular necrosis (AVN) for this specific injury pattern?

Explanation

Hawkins classification for talar neck fractures determines the risk of AVN. Type I: Undisplaced (0-15% AVN risk). Type II: Associated with subtalar subluxation/dislocation (20-50% AVN risk). Type III: Subtalar and tibiotalar dislocation (approaching 90-100% AVN risk). Type IV (Canale addition): Subtalar, tibiotalar, and talonavicular dislocation (~100% AVN risk).

Question 5

During open reduction and internal fixation of a distal femur fracture, a coronal plane fracture of the lateral femoral condyle (Hoffa fragment) is identified. To appropriately compress and fix this articular fragment, what is the ideal direction of the lag screws?

Explanation

A Hoffa fracture is a coronal shear fracture of the femoral condyle. Biomechanically, fixation is optimally achieved using anterior-to-posterior (AP) directed lag screws. This configuration provides perpendicular compression across the coronal fracture plane and allows the screw heads to be countersunk outside the primary articular weight-bearing surface.

Question 6

A 22-year-old male is involved in a high-speed motor vehicle collision. He presents with a closed midshaft femur fracture, bilateral pulmonary contusions, and a closed head injury (GCS 14). His initial BP is 90/60 mmHg, HR 120 bpm, lactate 4.5 mmol/L, and base deficit -8. After resuscitation with crystalloids and 2 units of packed RBCs, his lactate drops to 3.8 and base deficit to -6. What is the most appropriate management of his femur fracture?

Explanation

This polytrauma patient is in a 'borderline' or 'unstable' physiologic state based on persistent elevated lactate, base deficit, and an associated severe chest injury (pulmonary contusions). Under Damage Control Orthopedics (DCO) principles, definitive intramedullary nailing can precipitate ARDS. Rapid provisional stabilization with an external fixator is indicated until his physiology normalizes.

Question 7

A 40-year-old obese male presents to the Emergency Room after sustaining a low-velocity knee dislocation while playing basketball. The knee is currently reduced, and physical examination reveals a symmetric, palpable dorsalis pedis pulse. An ankle-brachial index (ABI) is performed, yielding a value of 0.85. What is the most appropriate next step in management?

Explanation

In the setting of a knee dislocation, an ABI < 0.9 is highly suspicious for a significant arterial injury (specifically the popliteal artery). Even with palpable pulses, this finding is an absolute indication for an advanced vascular imaging study, most commonly a CT angiogram, to rule out intimal tears or occult vascular compromise.

Question 8

A 65-year-old female sustains a displaced 3-part proximal humerus fracture. According to Hertel's criteria, which of the following fracture characteristics is the most critical predictor of subsequent avascular necrosis (AVN) of the humeral head?

Explanation

Hertel's criteria for predicting ischemia of the humeral head following proximal humerus fractures highlight that a posteromedial metaphyseal head extension (calcar length) of less than 8 mm and disruption of the medial hinge are the strongest predictors of ischemia. These factors indicate compromised blood supply from the ascending branch of the anterior humeral circumflex artery and posterior ascending intraosseous vessels.

Question 9

A 32-year-old male sustains a closed transverse midshaft humerus fracture and presents with an immediate complete wrist drop. An initial attempt at closed reduction and functional bracing is performed. The radial nerve palsy persists immediately post-reduction. What is the most appropriate next step in the management of the radial nerve palsy?

Explanation

Radial nerve palsy associated with closed humeral shaft fractures is predominantly a neuropraxia. The standard of care is expectant management (clinical observation) for 3-4 months. Surgical exploration is initially reserved for open fractures, failure of closed reduction, or failure to recover clinically or electromyographically by 4-6 months. Secondary palsies after manipulation are controversial but often observed.

Question 10

A 42-year-old male requires open reduction and internal fixation of a highly displaced intra-articular calcaneus fracture via an extensile lateral approach. Which of the following neurological structures is most at risk during the creation of the full-thickness subperiosteal flap?

Explanation

The extensile lateral approach to the calcaneus involves an L-shaped incision, requiring the careful creation of a full-thickness subperiosteal flap. The sural nerve crosses the lateral aspect of the hindfoot and is the primary structure at risk when making the vertical and horizontal limbs of the incision and elevating the soft tissue flap.

Question 11

A 28-year-old motorcyclist sustains a Gustilo-Anderson Type IIIB open fracture of the middle third of the tibia. After thorough surgical debridement, a free tissue transfer will be required for coverage. According to established microsurgical trauma literature, what is the optimal timeframe for definitive soft tissue coverage to minimize infection rates and flap failure?

Explanation

Classic literature (Godina) and modern limb salvage protocols demonstrate that early soft tissue coverage of severe open tibia fractures (Type IIIB) within 72 hours significantly decreases the rate of flap failure, deep infection, and nonunion compared to delayed coverage (beyond 7-10 days).

Question 12

A 24-year-old football player presents with midfoot pain after an axial load force was applied to his plantar-flexed foot. Weight-bearing radiographs demonstrate a 3 mm diastasis between the base of the first and second metatarsals. What is the primary stabilizing structure disrupted in this classic Lisfranc injury?

Explanation

The Lisfranc ligament is an essential interosseous ligament that connects the lateral aspect of the medial cuneiform to the medial base of the second metatarsal. It is the critical stabilizer of the midfoot complex. There is no direct transverse ligamentous connection between the bases of the first and second metatarsals.

Question 13

A 7-year-old boy falls on an outstretched hand and sustains a Bado Type I Monteggia fracture-dislocation. Which of the following describes the correct anatomic configuration of a Bado Type I injury?

Explanation

The Bado classification system for Monteggia fractures (ulna fracture with radial head dislocation) dictates: Type I (most common): Anterior angulation of the ulna fracture with anterior radial head dislocation. Type II: Posterior angulation/dislocation. Type III: Lateral angulation/dislocation. Type IV: Proximal radius and ulna fractures with anterior radial head dislocation.

Question 14

A 55-year-old female undergoes volar locking plate fixation for a comminuted distal radius fracture. Six months postoperatively, she presents to the clinic with an inability to actively flex the interphalangeal joint of her thumb. What is the most likely pathophysiological cause of her presentation?

Explanation

The most common tendon complication following volar plating of the distal radius is rupture of the flexor pollicis longus (FPL) tendon. This typically occurs due to attritional wear when the plate is placed too distally, crossing the 'watershed line' of the distal radius, leading to chronic friction against the tendon.

Question 15

A 30-year-old male sustains a posterior wall and posterior column acetabular fracture with a native hip dislocation following a dashboard injury. He requires surgical fixation. Which of the following surgical approaches is most appropriate for direct visualization and definitive fixation of these specific fracture components?

Explanation

The Kocher-Langenbeck approach provides excellent access to the posterior structures of the acetabulum, specifically the posterior column and posterior wall. It is the gold standard surgical approach for these posterior fracture patterns. Anterior approaches (Ilioinguinal, Stoppa) are utilized for anterior column/wall and quadrilateral plate injuries.

Question 16

A 28-year-old male sustains an ankle fracture with a concomitant syndesmotic disruption. During operative fixation, a syndesmotic screw is planned. Which radiographic parameter on a perfect mortise view is considered the most reliable metric to intraoperatively assess the anatomic integrity of the syndesmosis?

Explanation

On an AP or mortise radiograph, the tibiofibular clear space is measured 1 cm proximal to the plafond. A distance of < 6 mm is considered normal and is the most reliable radiographic parameter for evaluating syndesmotic integrity, as it does not vary significantly with foot rotation, unlike the tibiofibular overlap.

Question 17

A 24-year-old male presents with a closed, highly comminuted tibial shaft fracture. He complains of severe pain out of proportion to his injury. His clinical exam is equivocal due to his high anxiety. His blood pressure is 110/70 mmHg. Intracompartmental pressure testing is performed. Which of the following criteria provides the most accepted and specific threshold for performing a four-compartment fasciotomy?

Explanation

The most widely accepted threshold for diagnosing compartment syndrome using pressure measurements is a Delta P (Diastolic blood pressure minus intracompartmental pressure) of less than 30 mmHg. Relying on absolute pressure can lead to overtreatment, especially in hypotensive patients, whereas Delta P appropriately accounts for the local tissue perfusion pressure.

Question 18

A 45-year-old active smoker presents with persistent pain 9 months after intramedullary nailing of a closed tibial shaft fracture. Radiographs demonstrate a distinct fracture line with significant hypertrophic callus formation ('elephant foot' appearance) but lack bridging across the fracture site. What is the underlying cause of this specific type of nonunion?

Explanation

A hypertrophic ('elephant foot') nonunion is characterized by abundant callus formation that fails to bridge the fracture gap. It indicates that the biological environment and blood supply are excellent, but the mechanical stability is inadequate to allow the cartilaginous phase of the callus to ossify and bridge. Treatment involves improving stability, typically by exchange nailing or compression plating.

Question 19

A 38-year-old male sustains a severe APC-III pelvic fracture and arrives in hemorrhagic shock. Despite immediate pelvic binder application and massive transfusion protocol, he remains hypotensive and tachycardic. In the majority of pelvic ring injuries, what is the most common anatomic source of massive internal hemorrhage?

Explanation

While arterial bleeding (especially from the superior gluteal artery or internal pudendal) can be life-threatening and may require angioembolization, bleeding from the presacral venous plexus and the fractured cancellous bone surfaces accounts for approximately 80-90% of all pelvic bleeding. A pelvic binder works by closing the pelvic volume, facilitating a tamponade effect primarily on these low-pressure venous and osseous bleeding sources.

Question 20

A 6-year-old girl falls from monkey bars and sustains a Gartland Type III extension-type supracondylar humerus fracture. On arrival, her hand is pink and warm, but she lacks a palpable radial pulse. Capillary refill is brisk (<2 seconds). Which of the following is the most appropriate initial management for this patient?

Explanation

A 'pink, pulseless' hand is a classic clinical scenario in pediatric supracondylar humerus fractures, commonly due to kinking, spasm, or tethering of the brachial artery. The accepted initial management is urgent closed reduction and percutaneous pinning. Often, the pulse returns once the fracture is reduced. If the hand remains well-perfused (pink) despite no palpable pulse after reduction, observation is acceptable. Immediate exploration is reserved for a 'white, pulseless' hand that does not improve after reduction.

Question 21

In the surgical management of a lateral Hoffa fracture (OTA/AO 33B3), which of the following statements regarding the biomechanics of fixation is most accurate?

Explanation

Biomechanical studies have demonstrated that posterior-to-anterior (PA) directed lag screws are biomechanically superior to anterior-to-posterior (AP) directed screws for coronal plane (Hoffa) fractures of the distal femur. The LCL typically attaches to the anterior fragment (lateral epicondyle), not the posterior fragment.

Question 22

A 45-year-old female presents after an MVC with a pelvic ring injury. Radiographs demonstrate a lateral compression injury.

Which of the following specifically defines an LC-II injury according to the Young-Burgess classification?

Explanation

In the Young-Burgess classification, an LC-I injury involves a sacral compression fracture on the side of impact. An LC-II injury involves an iliac wing fracture (specifically a crescent fracture) on the side of impact due to internal rotation forces continuing through the ilium. An LC-III is a "windswept pelvis" with an LC injury on the impact side and an APC injury on the contralateral side.

Question 23

A 32-year-old man sustains an acetabular fracture. CT scan reveals a fracture line separating the anterior half of the innominate bone from the intact posterior ilium, associated with a transverse fracture line through the posterior column. Which Letournel classification best fits this pattern?

Explanation

An anterior column and posterior hemitransverse (ACPHT) fracture is characterized by a primary anterior column fracture with a secondary transverse component extending through the posterior column. Unlike a both column fracture, a portion of the articular surface (usually the posterior roof) remains attached to the intact axial skeleton.

Question 24

In the evaluation of a complex tibial pilon fracture, the anterolateral fragment is frequently avulsed. What ligamentous structure attaches to this specific fragment?

Explanation

The anterolateral fragment of the distal tibia is commonly referred to as the Chaput fragment. It serves as the attachment for the anterior inferior tibiofibular ligament (AITFL). The posterolateral fragment is the Volkmann fragment, which is the attachment site for the PITFL.

Question 25

A 28-year-old male sustains a displaced talar neck fracture with subluxation of the subtalar joint, while the tibiotalar and talonavicular joints remain congruous. According to the Hawkins classification, what is the type and approximate historical risk of avascular necrosis (AVN)?

Explanation

Hawkins type II is defined as a talar neck fracture with subluxation or dislocation of the subtalar joint, while the tibiotalar and talonavicular joints remain intact. The risk of AVN is historically reported as 20-50%. Hawkins I: undisplaced (0-10%). Hawkins III: subtalar and tibiotalar dislocation (approaching 100%).

Question 26

A 42-year-old construction worker falls from a height and sustains a closed, displaced intra-articular calcaneus fracture. The Sanders classification is utilized for operative planning. Which specific anatomic structure is the primary landmark used to determine the Sanders classification?

Explanation

The Sanders classification is based on coronal CT images detailing the posterior facet of the calcaneus. It categorizes fractures based on the number and location of primary fracture lines extending through the posterior facet. The sustentaculum fragment, although critical for reduction, is not the basis of the classification.

Question 27

A 24-year-old athlete sustains a hyperplantarflexion injury to the midfoot. Radiographs demonstrate subtle widening between the 1st and 2nd metatarsal bases and a "fleck sign."

The "fleck sign" typically represents an avulsion of the Lisfranc ligament from which structure?

Explanation

The Lisfranc ligament connects the medial cuneiform to the base of the second metatarsal. The "fleck sign" represents a bony avulsion of this ligament, most commonly from its attachment on the base of the second metatarsal, indicating significant midfoot instability.

Question 28

In evaluating a displaced proximal humerus fracture, which of the following radiographic criteria (Hertel criteria) is the most reliable predictor of ensuing avascular necrosis (AVN) of the humeral head?

Explanation

Hertel criteria for predicting ischemia/AVN of the humeral head include: a metaphyseal head extension (calcar length) of less than 8 mm, disruption of the medial hinge (> 2mm), and a basicervical fracture pattern. A short calcar segment (< 8mm) combined with medial hinge disruption is highly predictive of AVN.

Question 29

A 30-year-old male presents with a closed spiral fracture of the distal third of the humeral shaft resulting from a throwing injury. On examination, he is unable to extend his wrist or fingers. Which of the following is the most appropriate initial management?

Explanation

A Holstein-Lewis fracture is a spiral fracture of the distal third of the humerus. Although associated with radial nerve palsy (up to 22%), the standard of care is initial nonoperative management with a coaptation splint or functional bracing, as the vast majority (over 85%) of closed primary radial nerve palsies will undergo spontaneous recovery.

Question 30

A fracture involving the capitellum and the lateral half of the trochlea in a single piece, with associated posterior condylar comminution, is evaluated on a CT scan.

According to the Dubberley classification, this is classified as:

Explanation

The Dubberley classification evaluates coronal shear fractures of the distal humerus. Type 1: primarily capitellum. Type 2: capitellum and lateral half of trochlea in a single fragment. Type 3: capitellum and trochlea as separate fragments. Modifiers A and B indicate the absence (A) or presence (B) of posterior condylar comminution. Thus, Type 2B involves the capitellum and trochlea as one piece with posterior comminution.

Question 31

A 6-year-old child presents with a hyperpronation injury to the forearm. Radiographs reveal a fracture of the proximal ulna with an associated radial head dislocation. The radial head is dislocated laterally. According to the Bado classification, what type of Monteggia lesion is this?

Explanation

The Bado classification for Monteggia fractures: Type I: Anterior dislocation. Type II: Posterior dislocation. Type III: Lateral or anterolateral dislocation with an ulnar metaphyseal fracture. Type IV: Anterior dislocation with fractures of both the radius and ulna. Type III is most commonly seen in children following a hyperpronation force.

Question 32

A 40-year-old female presents after falling on an outstretched hand, sustaining a "terrible triad" injury of the elbow.

Which of the following accurately describes the typical sequence of surgical repair for this injury?

Explanation

The standard surgical algorithm for a terrible triad injury (elbow dislocation, radial head fracture, coronoid fracture) typically proceeds deep to superficial, or anterior to posterior. It involves fixing the coronoid first (if accessible/indicated), followed by the radial head, and then repairing the lateral ulnar collateral ligament (LUCL/LCL complex). The MCL is generally only repaired if gross instability persists.

Question 33

A 35-year-old male is struck by a motor vehicle and sustains a closed pelvic ring injury. Examination reveals a large, fluctuant area over the greater trochanter with overlying skin hypermobility and bruising. An MRI confirms a hemolymphatic fluid collection between the subcutaneous fat and the underlying fascia. What is the most appropriate initial management of this soft tissue injury to prevent deep infection prior to definitive internal fixation?

Explanation

The clinical presentation is classic for a Morel-Lavallée lesion (a closed degloving injury). Because a surgical approach for fracture fixation often must pass through or near the lesion, the standard of care to minimize infection is early open debridement of necrotic tissue and evacuation of the hematoma, frequently utilizing negative pressure wound therapy prior to or concurrently with definitive fixation.

Question 34

In the evaluation of a patient with a severe tibial shaft fracture, acute compartment syndrome is suspected. Intracompartmental pressure measurements are obtained. Which of the following parameters is considered the most reliable indicator for performing a fasciotomy?

Explanation

Delta P (ΔP) is considered the most reliable objective measurement for the diagnosis of acute compartment syndrome. It is calculated as Diastolic Blood Pressure minus Intracompartmental Pressure. A ΔP of less than 30 mmHg indicates inadequate tissue perfusion and is a strong indication for fasciotomy. Absolute pressures can be misleading in hypotensive trauma patients.

Question 35

A 25-year-old male sustains a gunshot wound to the thigh with a fractured femoral shaft. The weapon was a high-velocity military rifle. Which of the following principles best guides the management of the soft tissues in this injury?

Explanation

High-velocity gunshot wounds (> 2,000 feet per second) cause significant cavitation and extensive soft tissue destruction far beyond the permanent tract. They must be treated as high-energy open fractures requiring formal surgical exploration in the OR, extensive debridement of necrotic tissue, and delayed closure.

Question 36

A 38-year-old man sustains an open fracture of the tibia. There is a 12 cm laceration with extensive muscle stripping and a segmental fracture pattern. Pulses are non-palpable distally, and an angiogram demonstrates a complete transection of the popliteal artery requiring a saphenous vein graft repair. According to the Gustilo-Anderson classification, what is the grade of this open fracture?

Explanation

The Gustilo-Anderson classification evaluates open fractures. Grade IIIC is defined as any open fracture associated with an arterial injury that requires formal surgical repair for limb salvage, regardless of the extent of the soft tissue injury.

Question 37

In the polytraumatized patient, the concept of "Damage Control Orthopedics" (DCO) is often employed to minimize the "second hit" phenomenon. Which of the following physiologic parameters would most strongly indicate the need for DCO rather than Early Total Care (ETC) for a femoral shaft fracture?

Explanation

Damage Control Orthopedics (DCO) involves rapid, temporary stabilization (such as external fixation) for patients "in extremis" or borderline. Indicators for DCO over ETC include severe acidemia (pH < 7.24), hypothermia (< 35°C), coagulopathy (platelets < 90,000), prolonged shock (lactate > 2.5 mmol/L), and massive transfusion needs. A pH of 7.15 is a clear indication for DCO.

Question 38

An 82-year-old female sustains a non-displaced femoral neck fracture. To minimize mortality and morbidity, national guidelines recommend that surgical intervention should ideally be performed within what timeframe from admission?

Explanation

There is a strong consensus among major orthopedic societies (e.g., AAOS) that surgical intervention for geriatric hip fractures should ideally be performed within 24 to 48 hours of admission. Delays beyond this timeframe significantly increase mortality, pneumonia, DVT, and pressure ulcers.

Question 39

A 25-year-old male sustains a femoral neck fracture.

The fracture line is oriented 75 degrees relative to the horizontal. According to the Pauwels classification, this is a Type III fracture. Which of the following statements best describes the biomechanical forces and optimal fixation strategy for this fracture?

Explanation

Pauwels Type III fractures (>50 degrees from the horizontal) are characterized by a vertically oriented fracture line. This results in high shear forces and varus instability. Biomechanical studies demonstrate that a fixed-angle device, such as a Dynamic Hip Screw (DHS) (often supplemented with an anti-rotation screw), provides superior stability against these shear forces compared to parallel cancellous screws.

Question 40

A 45-year-old male presents with a high-energy medial tibial plateau fracture (Schatzker IV). This fracture pattern is frequently a result of a high-energy varus/axial load. Which of the following injuries is most strongly associated with this specific fracture pattern, requiring careful clinical assessment?

Explanation

Schatzker IV (medial tibial plateau) fractures often result from high-energy trauma and frequently represent a true fracture-dislocation of the knee. Due to the significant energy required to shear the dense medial column, there is a substantial risk of associated knee dislocation and subsequent popliteal artery injury. Peroneal nerve injuries are more commonly associated with high-energy lateral plateau injuries.

Question 41

Proximal third tibial shaft fractures treated with intramedullary nailing in extension are classically associated with which of the following malalignments?

Explanation

Proximal third tibia fractures nailed in extension classically fall into apex anterior (procurvatum) and valgus malalignment due to the pull of the extensor mechanism and an eccentric starting point. Techniques such as suprapatellar nailing or blocking screws help prevent this.

Question 42

A 35-year-old polytrauma patient with bilateral femur fractures presents with a lactate of 4.5 mmol/L, pH 7.2, and base excess of -8. According to Damage Control Orthopedics (DCO) principles, what is the most appropriate initial management of the femur fractures?

Explanation

This patient is in extremis based on the high lactate, acidosis, and negative base excess. Under DCO principles, early definitive care with intramedullary nailing is contraindicated, and rapid temporary stabilization with external fixation is required.

Question 43

During the surgical approach for a terrible triad injury of the elbow, what is the generally recommended sequence of reconstruction to restore elbow stability?

Explanation

The standard protocol for a terrible triad injury involves a deep-to-superficial repair sequence. This entails fixation of the coronoid first, followed by radial head repair or arthroplasty, and finally repair of the lateral collateral ligament complex.

Question 44

A 40-year-old male sustains a Type IIIB open tibial shaft fracture. Following initial debridement and external fixation, when is the optimal time for definitive soft tissue coverage to minimize infection risk?

Explanation

Early soft tissue coverage of Type IIIB open tibia fractures within 72 hours is associated with significantly lower rates of deep infection and flap failure. Delaying coverage beyond 5 to 7 days drastically increases the risk of nosocomial colonization.

Question 45

In the management of a displaced Hoffa fracture (coronal shear fracture of the femoral condyle), what is the optimal direction of lag screw placement for maximum biomechanical stability against physiological forces?

Explanation

Anterior-to-posterior (AP) lag screw placement provides superior biomechanical stability against vertical shear forces in Hoffa fractures compared to posterior-to-anterior screws. However, PA screws are often used concurrently to aid in articular congruity.

Question 46

A patient with a displaced posterior wall acetabular fracture presents with a foot drop preoperatively. Which nerve division is most commonly injured in this scenario?

Explanation

The peroneal division of the sciatic nerve is most commonly injured in posterior hip dislocations and posterior wall acetabular fractures. This is because it is positioned more laterally, is more tightly tethered, and has less supportive connective tissue.

Question 47

Which ligament is considered the strongest and most critical for maintaining the structural stability of the Lisfranc complex?

Explanation

The interosseous ligament, commonly known as the Lisfranc ligament, connects the medial cuneiform to the base of the second metatarsal. It is the thickest and strongest ligament stabilizing the complex, whereas the dorsal ligaments are the weakest.

Question 48

Eight weeks following open reduction and internal fixation of a Hawkins Type II talar neck fracture, an AP radiograph demonstrates a subchondral radiolucent band in the talar dome. What does this finding indicate?

Explanation

This subchondral radiolucent band is the Hawkins sign, representing subchondral osteopenia secondary to active hyperemia. It is a highly reliable indicator that the talar body has an intact vascular supply, making avascular necrosis unlikely.

Question 49

When utilizing an extensile lateral approach for a displaced intra-articular calcaneus fracture, the surgical flap relies primarily on which of the following vessels for its blood supply?

Explanation

The full-thickness fasciocutaneous flap in the extensile lateral approach to the calcaneus is primarily supplied by the lateral calcaneal artery, a branch of the peroneal artery. Careful "no-touch" retraction is vital to protect this vessel and the sural nerve.

Question 50

In a patient with recurrent anterior shoulder instability, advanced 3D imaging reveals 25% anterior glenoid bone loss. Which of the following is the most appropriate definitive surgical intervention?

Explanation

In the setting of significant anterior glenoid bone loss (typically greater than 20-25%), an isolated soft tissue repair has an unacceptably high failure rate. A bony augmentation procedure, such as the Latarjet, is indicated to restore joint stability and the articular arc.

Question 51

A patient undergoes volar plating for a distal radius fracture. Postoperatively, the patient develops an attrition rupture of the flexor pollicis longus (FPL) tendon. This complication is most commonly associated with plate placement distal to which anatomical landmark?

Explanation

Placing a volar locking plate distal to the watershed line of the distal radius causes prominence of the hardware against the volar flexor tendons. This leads to friction, tenosynovitis, and potential attrition rupture of the flexor pollicis longus (FPL) tendon.

Question 52

A patient presents with severe leg pain following a closed tibial shaft fracture. Which of the following findings is the most reliable early clinical indicator of acute compartment syndrome?

Explanation

Pain out of proportion to the apparent injury and pain that is highly exacerbated by passive stretching of the involved muscles are the earliest and most reliable clinical signs of acute compartment syndrome. Pulselessness and paralysis are late, irreversible signs.

Question 53

A patient sustains a high-energy pelvic ring injury. During surgical exploration via an ilioinguinal approach, massive hemorrhage occurs near the superior pubic ramus. Which vascular structure is most likely injured?

Explanation

The corona mortis is a vascular anastomosis between the external iliac/inferior epigastric and the obturator vessels. It lies directly over the superior pubic ramus, making it highly susceptible to injury in pelvic ring trauma and anterior surgical approaches.

Question 54

According to the Denis classification of sacral fractures, fractures occurring in Zone 3 are most commonly associated with which of the following complications?

Explanation

Denis Zone 3 sacral fractures involve the central sacral canal. They carry the highest risk (often over 50%) of cauda equina syndrome, which manifests as severe bowel, bladder, and sexual dysfunction due to bilateral sacral nerve root involvement.

Question 55

A young adult sustains an isolated transverse fracture of the scaphoid waist. What is the primary anatomical reason this fracture pattern carries a high risk for avascular necrosis of the proximal pole?

Explanation

The scaphoid receives its primary blood supply from the dorsal carpal branch of the radial artery, which enters the distal pole and flows in a retrograde fashion to the proximal pole. A waist fracture interrupts this intraosseous supply, frequently causing AVN of the proximal pole.

Question 56

A 25-year-old male sustains a traumatic knee dislocation. Following closed reduction, the patient has palpable pedal pulses but an Ankle-Brachial Index (ABI) of 0.8. What is the most appropriate next step in management?

Explanation

In a patient with a knee dislocation, an ABI less than 0.9 or asymmetric pulses indicates a high index of suspicion for popliteal artery intimal injury. CT angiography is the standard non-invasive imaging modality required to definitively evaluate the vascular tree.

Question 57

A 65-year-old female sustains a subtrochanteric femur fracture. Biomechanically, what is the primary deforming force causing flexion and external rotation of the proximal fracture fragment?

Explanation

In subtrochanteric femur fractures, the proximal fragment is predictably deformed into flexion and external rotation by the pull of the iliopsoas tendon on the lesser trochanter. Abduction is driven by the gluteus medius and minimus.

Question 58

A 30-year-old patient with an open Type IIIA diaphyseal femur fracture undergoes immediate intramedullary nailing. What is the current consensus regarding the optimal duration of prophylactic antibiotic therapy after definitive wound closure?

Explanation

Current orthopedic trauma guidelines advocate limiting prophylactic antibiotics for severe open fractures to 24-72 hours after the injury, or 24 hours after definitive soft tissue closure. Prolonged antibiotics increase the risk of resistant organisms without decreasing infection rates.

Question 59

A 22-year-old male presents with a gunshot wound to the right knee. Radiographs reveal a retained bullet directly within the intra-articular space, with a minimally displaced osteochondral fracture. What is the recommended management?

Explanation

A retained bullet within a synovial joint requires surgical extraction. Lead bullets exposed to synovial fluid will dissolve, leading to systemic lead toxicity (plumbism) and severe localized mechanical and chemical joint destruction known as lead arthropathy.

Question 60

In a patient with a suspected syndesmotic injury following an ankle fracture, intraoperative fluoroscopy is used to perform a "Cotton test." Which maneuver accurately describes this test?

Explanation

The Cotton test is performed intraoperatively by applying lateral traction to the fibula with a bone hook or clamp under fluoroscopy. Asymmetric widening of the tibiofibular clear space confirms syndesmotic instability requiring fixation.

Question 61

A 32-year-old male presents with a Hawkins type III talar neck fracture following a motor vehicle collision. Which of the following best describes the specific vascular disruption that places him at an 80-100% risk for avascular necrosis?

Explanation

Hawkins III fractures involve dislocation of both the subtalar and tibiotalar joints, disrupting all three main blood supplies to the talar body. These include the artery of the tarsal canal, the artery of the tarsal sinus, and the deltoid branches.

Question 62

During open reduction and internal fixation of a comminuted posterior wall acetabular fracture, an area of marginal impaction is identified. What is the most appropriate management of this articular fragment?

Explanation

Marginal impaction must be elevated to restore the articular congruity of the acetabulum. The resulting metaphyseal void must be filled with cancellous bone graft to support the elevated cartilage before definitive plating.

Question 63

A 40-year-old female sustains a distal femur fracture. CT imaging reveals a coronal plane fracture of the lateral femoral condyle (Hoffa fracture). Which of the following fixation strategies provides the most biomechanically stable construct for this specific fragment?

Explanation

Hoffa fractures are coronal shear fractures of the femoral condyles. Posterior-to-anterior (PA) directed lag screws have been shown biomechanically to provide superior fixation compared to anterior-to-posterior screws.

Question 64

A 25-year-old male polytrauma patient with bilateral femoral shaft fractures and a severe pulmonary contusion has a serum lactate of 4.5 mmol/L and a base deficit of -8. According to damage control orthopedics (DCO) principles, what is the most appropriate initial skeletal management?

Explanation

In a borderline or unstable polytrauma patient (elevated lactate, high base deficit, severe chest trauma), damage control orthopedics dictates initial stabilization with spanning external fixation. This minimizes the systemic inflammatory response and avoids a 'second hit' phenomenon.

Question 65

When treating a proximal third extra-articular tibia fracture with an intramedullary nail, the fracture is at highest risk for which of the following post-operative malalignments?

Explanation

Proximal third tibia fractures are notoriously difficult to control with intramedullary nailing. They commonly result in apex anterior (procurvatum) and valgus deformity due to the pull of the patellar tendon and the wide metaphyseal flare.

Question 66

A 50-year-old male sustains a subtrochanteric femur fracture. During closed reduction, the proximal fragment is noted to be severely displaced. Which combination of muscles is responsible for the classic flexion, abduction, and external rotation deformity of the proximal segment?

Explanation

The proximal fragment in a subtrochanteric fracture is deformed into flexion by the iliopsoas, abduction by the gluteus medius and minimus, and external rotation by the short external rotators.

Question 67

In the surgical treatment of a displaced intra-articular calcaneus fracture, the 'constant fragment' remains anatomically aligned with the talus. Which structure provides the primary ligamentous attachment holding this fragment in place?

Explanation

The sustentaculum tali is considered the 'constant fragment' because it remains firmly attached to the talus via the strong interosseous talocalcaneal and deltoid ligaments. It serves as the medial foundation for calcaneal reconstruction.

Question 68

According to the Lower Extremity Assessment Project (LEAP) study, which of the following is the most significant predictor of poor long-term functional outcome following severe, limb-threatening lower extremity trauma?

Explanation

The LEAP study demonstrated that initial plantar sensation, injury severity, and Gustilo grade did not definitively predict long-term functional outcomes. Instead, psychosocial factors such as social support, education level, and smoking status were the strongest predictors of poor functional recovery.

Question 69

A 65-year-old female who has been taking alendronate for 8 years presents with severe, progressive right thigh pain. Radiographs reveal cortical thickening and a transverse radiolucent line on the lateral cortex of the subtrochanteric femur, but no complete fracture. What is the most appropriate management?

Explanation

This patient has an impending atypical femur fracture (AFF) associated with long-term bisphosphonate use. Because she has severe "prodromal" pain and a visible cortical defect, prophylactic intramedullary nailing is indicated to prevent completion of the fracture.

Question 70

Recent quantitative anatomical studies (e.g., Hettrich et al.) have redefined the primary arterial blood supply to the humeral head. Which vessel provides the majority of the blood supply to the humeral head, putting it at risk for avascular necrosis in 4-part proximal humerus fractures?

Explanation

Historically, the anterior humeral circumflex artery (via the arcuate branch) was thought to be the primary supply. However, recent studies demonstrate that the posterior humeral circumflex artery provides approximately 64% of the blood supply to the humeral head.

Question 71

A 30-year-old male sustains a closed, spiral fracture of the distal third of the humeral shaft (Holstein-Lewis fracture). On initial presentation in the emergency department, his radial nerve function is intact. Following a closed reduction and application of a coaptation splint, he develops a complete wrist drop and inability to extend his fingers. What is the most appropriate next step in management?

Explanation

A radial nerve palsy that develops AFTER a closed reduction of a humeral shaft fracture is an absolute indication for surgical exploration. This secondary palsy suggests the nerve may have become entrapped in the fracture site during manipulation.

Question 72

A 40-year-old male involved in a high-speed motor vehicle collision sustains an isolated intra-articular distal femur fracture. CT imaging demonstrates a coronal plane fracture of the lateral femoral condyle (Hoffa fracture). Which fixation strategy offers the highest biomechanical stability for this specific fragment?

Explanation

A Hoffa fracture is a coronal shear fracture of the femoral condyle. Posterior-to-anterior (PA) directed lag screws are biomechanically superior to AP screws because they are directed perpendicular to the fracture line and engage the dense anterior cortical bone.

Question 73

A 25-year-old polytrauma patient (ISS 45) presents with bilateral closed femoral shaft fractures, severe bilateral pulmonary contusions, and a pelvic ring injury. His initial serum lactate is 4.5 mmol/L, base deficit is 8 mEq/L, and temperature is 34.5°C. What is the most appropriate initial management of his femoral fractures?

Explanation

This patient is physiologically unstable (acidosis, hypothermia, high ISS, and pulmonary contusions), meeting the criteria for Damage Control Orthopedics (DCO). Immediate reamed intramedullary nailing in this setting risks a "second hit" phenomenon, exacerbating ARDS and systemic inflammation; therefore, temporary external fixation is indicated.

Question 74

A 45-year-old male sustains a pelvic injury after being struck by a vehicle from the side. Pelvic radiographs and CT demonstrate an internal rotation deformity of the hemipelvis with a fracture extending from the sacroiliac joint through the posterior iliac wing. How is this injury classified according to the Young-Burgess system?

Explanation

A fracture extending from the sacroiliac joint through the posterior iliac wing is known as a "crescent fracture." In the Young-Burgess classification, this defines a Lateral Compression Type II (LC-II) injury.

Question 75

An 8-week follow-up radiograph of a 25-year-old patient who sustained a talar neck fracture shows a distinct subchondral radiolucent band running across the talar dome. What does this radiographic finding signify?

Explanation

This finding is known as the Hawkins sign. The radiolucent line represents subchondral osteopenia secondary to active bone resorption, which can only occur if the vascular supply to the talar body is intact.

Question 76

A 35-year-old construction worker falls from a ladder and sustains a displaced intra-articular calcaneus fracture. The surgeon elects to perform an open reduction and internal fixation via an extensile lateral approach. Which of the following is the most common complication specifically associated with this surgical approach?

Explanation

The extensile lateral approach to the calcaneus involves creating a large full-thickness fasciocutaneous flap. Due to the tenuous vascular supply at the corner of the flap, wound edge necrosis and dehiscence are the most frequent and significant complications of this approach.

Question 77

A 22-year-old collegiate football player presents with severe midfoot pain after a plant-and-twist injury. Weight-bearing radiographs reveal a 3 mm widening between the base of the first and second metatarsals. The primary ligament disrupted in this injury normally connects which two anatomic structures?

Explanation

The Lisfranc ligament is an interosseous ligament that connects the lateral aspect of the medial cuneiform to the medial base of the second metatarsal. It is critical for the stability of the midfoot arch.

Question 78

A 45-year-old female falls onto an outstretched hand with her wrist in palmar flexion. Radiographs demonstrate a fracture of the volar margin of the distal radius with associated volar subluxation of the carpus. What is the eponymous name for this fracture pattern?

Explanation

A volar Barton fracture is a fracture-dislocation or subluxation in which the volar rim of the distal radius fractures and displaces volarly along with the carpus. It is a shear injury best treated with a volar buttress plate.

Question 79

Why is a fracture through the proximal pole of the scaphoid at a significantly higher risk for nonunion and avascular necrosis compared to a distal pole fracture?

Explanation

The major blood supply to the scaphoid comes from branches of the radial artery that enter the dorsal ridge near the waist and distal pole, flowing proximally in a retrograde manner. Fractures at the proximal pole isolate it from this blood supply, predisposing it to AVN.

Question 80

A 60-year-old male sustains a basicervical femoral neck fracture. From a biomechanical and treatment perspective, how should this specific fracture pattern be managed?

Explanation

Basicervical femoral neck fractures are extracapsular and biomechanically unstable. They behave much like intertrochanteric fractures and are best treated with fixed-angle devices like a cephalomedullary nail or a sliding hip screw with a derotation screw, rather than multiple cancellous screws.

Question 81

A 30-year-old male sustains a low-velocity gunshot wound to the thigh resulting in a comminuted midshaft femur fracture. The bullet passed cleanly through the thigh, and the patient has no vascular deficits. What is the most appropriate management of the fracture?

Explanation

Low-velocity gunshot wounds resulting in femur fractures without gross contamination or vascular injury are effectively treated as closed fractures. Standard management includes local wound care at the entry/exit sites and early intramedullary nailing without aggressive tract debridement.

Question 82

A 28-year-old male is admitted with a comminuted tibial shaft fracture. He complains of excruciating leg pain unresponsive to intravenous opioids. His current blood pressure is 110/60 mmHg. Intracompartmental pressure testing of the anterior compartment yields a measurement of 45 mmHg. What is the Delta P (ΔP), and what is the indicated treatment?

Explanation

Delta P is calculated as Diastolic Blood Pressure minus Compartment Pressure (60 - 45 = 15). A Delta P of less than 30 mmHg is highly specific for acute compartment syndrome and is an absolute indication for emergent 4-compartment fasciotomies. Wait, the math in the option is correct in 3 (15 mmHg). Wait, let's look at the options. Option 2 says 15 mmHg, option 3 says 25 mmHg. 60 - 45 = 15. The correct answer is Option 2 (index 2).

Question 83

A 40-year-old male sustains a high-energy OTA/AO 43-C3 pilon fracture. On presentation, the soft tissues about the ankle are severely swollen with multiple fracture blisters. What is the most appropriate initial management?

Explanation

High-energy pilon fractures are notorious for severe soft tissue compromise. The standard of care is a staged approach: initial joint-spanning external fixation to restore length and alignment while allowing the soft tissues to heal, followed by definitive internal fixation 10-21 days later.

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Key Takeaway

Orthopedic Ob Trauma D Review | Dr Hutaif Trauma & Frac -...

Chapter Index