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

Question 1

A 26-year-old male is brought to the emergency department following a high-speed motorcycle collision. He is hypotensive with a systolic BP of 80 mmHg. Laboratory results show a serum lactate of 4.8 mmol/L, a base deficit of -9, and a core temperature of 34.5°C. Radiographs reveal bilateral severely comminuted midshaft femur fractures. What is the most appropriate initial skeletal management?

Explanation

This patient is in extremis based on the 'lethal triad' parameters and markers of poor perfusion (lactate > 4.0 mmol/L, base deficit < -8, hypothermia). According to Damage Control Orthopedics (DCO) principles, early total care (ETC) with reamed intramedullary nailing is contraindicated as it may exacerbate the systemic inflammatory response and lead to ARDS or multi-organ failure. The most appropriate initial management is rapid temporary stabilization with bilateral external fixation.

Question 2

A hemodynamically unstable 35-year-old male presents after a crush injury. An AP radiograph of the pelvis demonstrates a 'symphyseal diastasis of 4 cm and disruption of the anterior sacroiliac ligaments'.

You decide to apply a circumferential pelvic binder to aid in resuscitation. To maximize its biomechanical efficacy in reducing pelvic volume, the binder should be centered precisely over which of the following anatomic landmarks?

Explanation

Circumferential pelvic binders are critical in the acute resuscitation of patients with unstable pelvic ring injuries (e.g., APC II or III). To effectively close the pelvic ring and reduce the intrapelvic volume, the binder must be centered over the greater trochanters. Placing the binder too proximally (over the iliac crests or ASIS) is a common error that can paradoxically widen the pelvic outlet or fail to reduce the diastasis.

Question 3

A 40-year-old male sustains an ipsilateral displaced femoral neck fracture and a comminuted midshaft femur fracture. Which of the following is the most appropriate surgical strategy and sequence to minimize complications?

Explanation

In ipsilateral femoral neck and shaft fractures, the priority is anatomic reduction and stable fixation of the femoral neck to minimize the risk of avascular necrosis and nonunion. Fixing the femoral neck first prevents further displacement of the neck fracture during the manipulation and reaming required for shaft fixation. A common and highly successful approach is to fix the neck with cannulated screws or a DHS, followed by a retrograde intramedullary nail for the shaft.

Question 4

A 30-year-old pedestrian is struck by a vehicle and sustains a severe open tibia fracture. After initial debridement, a 6 cm bone defect is present in the middle third of the tibial diaphysis with exposed bone devoid of periosteum.

Which of the following local muscle flaps is most appropriate for soft tissue coverage of this specific defect?

Explanation

For soft tissue coverage of the lower extremity, the leg is classically divided into thirds. The proximal third is best covered by the gastrocnemius flap (medial > lateral). The middle third is best covered by the soleus rotational flap. The distal third typically requires a free tissue transfer (e.g., latissimus dorsi, gracilis, ALT) due to the lack of adequate local muscle bulk, although reverse sural flaps can sometimes be used.

Question 5

A 25-year-old snowboarder sustains a high-energy dorsiflexion injury to the ankle. Radiographs reveal a displaced talar neck fracture with subluxation of the subtalar joint, while the tibiotalar joint remains congruous.

Based on the Hawkins classification, what is the approximate risk of developing avascular necrosis (AVN) of the talar body in this patient?

Explanation

This is a Hawkins Type II fracture, defined as a displaced talar neck fracture with subluxation or dislocation of the subtalar joint, while the ankle joint remains aligned. The rate of AVN for a Hawkins Type II fracture is historically reported as 20-50%. Type I (non-displaced) has an AVN rate of 0-15%. Type III (subtalar and tibiotalar dislocation) has an AVN rate approaching 100% in older literature, though modern rates are lower.

Question 6

During the extensile lateral approach for open reduction and internal fixation of a displaced intra-articular calcaneus fracture, a full-thickness subperiosteal flap is developed. Which of the following neurologic structures is at greatest risk of iatrogenic injury during the dissection of the inferior limb of the incision?

Explanation

The extensile lateral approach to the calcaneus involves an L-shaped incision. The inferior limb runs just superior to the plantar skin transition and the vertical limb runs between the fibula and the Achilles tendon. The sural nerve crosses the lateral border of the foot and is highly vulnerable to injury or entrapment, particularly if the vertical limb is placed too far anteriorly or the inferior limb is carried too far distally without meticulous full-thickness soft tissue handling.

Question 7

A 45-year-old male sustains a severe valgus stress injury to the knee, resulting in a Schatzker IV tibial plateau fracture with significant posteromedial depression. You plan a posteromedial surgical approach. The standard internervous/intermuscular plane for this approach is developed between which of the following structures?

Explanation

The posteromedial approach to the tibial plateau is critical for reducing and buttressing posteromedial shear fragments. The surgical interval is developed between the medial head of the gastrocnemius (retracted posteriorly/laterally) and the pes anserinus tendons (semitendinosus, gracilis, sartorius; retracted anteriorly/medially). Care must be taken to protect the saphenous nerve and great saphenous vein.

Question 8

A 32-year-old gymnast falls from a height and presents with an elbow dislocation, a comminuted radial head fracture, and a Type II coronoid fracture. According to established biomechanical principles for treating the 'terrible triad' of the elbow, what is the most widely recommended surgical sequence?

Explanation

The standard surgical algorithm for a terrible triad injury works from 'deep to superficial' or 'inside out'. The typical sequence is: 1) Fixation of the coronoid (to restore the anterior buttress), 2) Fixation or arthroplasty of the radial head (to restore the radiocapitellar anterior restraint), 3) Repair of the lateral ulnar collateral ligament (LUCL) to the lateral epicondyle. Repair of the MCL is usually only indicated if the elbow remains unstable after the first three steps.

Question 9

A 24-year-old male sustains a closed comminuted tibial shaft fracture. Eight hours post-injury, he complains of intractable pain out of proportion to the injury. His blood pressure is 110/70 mmHg. The intracompartmental pressure of the anterior compartment is measured at 45 mmHg. What is his Delta P, and is a fasciotomy definitively indicated?

Explanation

Delta P is calculated as Diastolic Blood Pressure minus Intracompartmental Pressure (Diastolic BP - ICP). In this patient, 70 mmHg - 45 mmHg = 25 mmHg. A Delta P of 30 mmHg or less is widely accepted as an absolute indication for emergency four-compartment fasciotomy, as capillary perfusion pressure is inadequate to prevent ischemic muscle necrosis.

Question 10

When utilizing a modern distal femoral locking plate for a comminuted metaphyseal distal femur fracture, the surgeon decides to leave several screw holes empty in the plate directly over the fracture site. What is the primary biomechanical advantage of increasing this 'working length'?

Explanation

In bridge plating of comminuted fractures with locking plates, absolute rigidity can lead to nonunion due to inadequate mechanical stimulation (too little strain). Increasing the 'working length' (the span of plate without screws across the fracture) decreases the overall stiffness of the construct. This allows for controlled micromotion at the fracture site (increasing interfragmentary strain into the optimal window), which robustly stimulates callus formation and secondary bone healing.

Question 11

A 55-year-old female presents with a high-energy closed distal tibia (Pilon) fracture.

The limb is grossly swollen with fracture blisters developing. A spanning ankle external fixator is applied in the emergency department. Definitive open reduction and internal fixation (ORIF) is planned. What is the most reliable clinical indicator that the soft tissues are amenable to definitive surgical incisions?

Explanation

The classic and most reliable clinical sign that swelling has sufficiently subsided to safely perform incisions for Pilon fractures (and other severe periarticular lower extremity trauma like calcaneus fractures) is the 'wrinkle sign'. This refers to the reappearance of normal skin lines and wrinkles when the ankle is dorsiflexed or passively manipulated. This typically occurs between 10 and 21 days post-injury.

Question 12

A 75-year-old female sustains a 3-part proximal humerus fracture.

According to the Hertel criteria, which of the following radiographic findings is most highly predictive of subsequent ischemia and avascular necrosis of the humeral head?

Explanation

Hertel described specific criteria predicting ischemia of the humeral head after proximal humerus fractures. The strongest predictors of ischemia are: 1) A calcar length (metaphyseal extension attached to the head) of less than 8 mm, 2) Disruption of the medial metaphyseal hinge, and 3) An anatomic neck fracture pattern. An intact medial hinge (>2 mm) is a predictor of maintained perfusion.

Question 13

A 35-year-old male arrives via trauma bay after a close-range shotgun blast to the lower extremity. The extremity is severely mangled. When using the Mangled Extremity Severity Score (MESS) to assist in deciding between amputation and limb salvage, which of the following factors specifically adds points to the patient's score?

Explanation

The MESS system evaluates four criteria: 1) Skeletal and soft-tissue injury (energy level), 2) Limb ischemia, 3) Shock (systemic hypotension), and 4) Patient Age. For Age, points are assigned as follows: <30 years = 0 points; 30-50 years = 1 point; >50 years = 2 points. A score of 7 or greater historically correlates with a high likelihood of amputation.

Question 14

A 68-year-old female on chronic alendronate therapy for osteoporosis complains of 3 months of vague left thigh pain. Radiographs reveal a transverse radiolucent line with focal cortical thickening on the lateral aspect of her left femoral shaft. What is the fundamental biomechanical reason these atypical femur fractures typically initiate at the lateral cortex?

Explanation

Atypical femoral fractures (AFFs) associated with prolonged bisphosphonate use characteristically begin at the lateral cortex. Biomechanically, the normal bow of the femur causes the lateral cortex to be placed under repetitive tensile stress during weight-bearing, while the medial cortex is under compressive stress. Over-suppression of targeted bone remodeling leads to accumulation of microdamage, which eventually manifests as a stress fracture on the tension (lateral) side.

Question 15

A 30-year-old male falls from a ladder and sustains an intra-articular distal radius fracture. The surgeon opts for a volar surgical approach utilizing the modified Henry interval. After retracting the flexor carpi radialis (FCR) ulnarly, which structure forms the floor of the approach and must be incised to directly expose the pronator quadratus?

Explanation

The modified Henry approach to the distal radius utilizes the internervous plane between the FCR (median nerve) and the brachioradialis (radial nerve). Upon incising the superficial sheath and retracting the FCR tendon ulnarly, the deep layer of the FCR tendon sheath forms the floor. Incising this deep sheath allows direct access to the pronator quadratus muscle and protects the palmar cutaneous branch of the median nerve.

Question 16

A 22-year-old football player presents with a midfoot injury and plantar ecchymosis. Weight-bearing radiographs show a 3 mm diastasis between the base of the first and second metatarsals. You suspect a Lisfranc injury. The primary stabilizing ligament of the Lisfranc complex originates on the lateral aspect of the medial cuneiform and inserts on the medial aspect of the base of the second metatarsal. What type of ligament is this primary restraint?

Explanation

The Lisfranc ligament complex connects the medial cuneiform to the second metatarsal base. It consists of dorsal, interosseous, and plantar components. The interosseous Lisfranc ligament is the thickest and strongest primary restraint to diastasis. There is no direct ligamentous connection between the first and second metatarsal bases.

Question 17

A 40-year-old male sustains a low-velocity civilian handgun injury to the right thigh. Radiographs demonstrate a comminuted midshaft femur fracture. His neurovascular exam is intact, and the wounds are small without gross contamination. What is the standard of care for definitive management?

Explanation

Civilian low-velocity gunshot wounds resulting in femur fractures without neurovascular injury or gross contamination can typically be treated similar to closed fractures. Formal excision of the bullet tract is unnecessary and increases surgical morbidity. Management consists of local wound care, tetanus prophylaxis, a short course of IV antibiotics, and early intramedullary nailing.

Question 18

A 25-year-old cyclist sustains a midshaft clavicle fracture. Which of the following displacement characteristics is most strongly associated with an increased risk of symptomatic nonunion if treated non-operatively?

Explanation

While non-operative management of midshaft clavicle fractures was historically the standard, recent evidence shows higher rates of nonunion and symptomatic malunion in specifically displaced patterns. The most widely accepted risk factor for nonunion/poor functional outcome is fracture shortening greater than 2 cm. Displacement >100% (complete off-ending) and severe comminution are also relative indications for ORIF.

Question 19

A 45-year-old pedestrian is struck by a car and dragged, sustaining a closed pelvic fracture and a large, fluctuant swelling over the lateral greater trochanter. Aspiration yields serosanguineous fluid. This lesion is caused by a shear force that results in the separation of which two anatomic layers?

Explanation

This is the classic presentation of a Morel-Lavallée lesion, which is a closed degloving injury. High-energy shear forces abruptly separate the subcutaneous tissue (hypodermis) from the relatively immobile underlying deep fascia. This creates a potential space that fills with blood, lymph, and liquefied fat, often requiring percutaneous drainage and sclerosis or open debridement if an underlying fracture requires surgical fixation.

Question 20

A 60-year-old male sustains an isolated transverse acetabular fracture involving the posterior wall. According to the Judet-Letournel classification, an isolated anterior column fracture would classically demonstrate a disruption of which primary radiographic line on the anteroposterior (AP) pelvis view?

Explanation

In the Judet-Letournel classification, the fundamental radiographic landmark for the anterior column is the iliopectineal line. The fundamental landmark for the posterior column is the ilioischial line. Disruption of the iliopectineal line with an intact ilioischial line suggests an isolated anterior column (or anterior wall) fracture.

Question 21

A 42-year-old farmer sustains a severe open tibia fracture after being caught in a tractor bailer. The wound is 12 cm long with gross soil and organic contamination. In addition to a first-generation cephalosporin and an aminoglycoside, which of the following antibiotics is classically recommended in his initial empiric regimen?

Explanation

In severe open fractures with heavy soil or farm contamination (Gustilo-Anderson Type III), anaerobic coverage with Penicillin is historically recommended to prevent Clostridium perfringens infection (gas gangrene). While modern guidelines sometimes utilize alternative anaerobic agents, Penicillin remains the classic board-tested standard.

Question 22

According to the principles of Damage Control Orthopedics (DCO), which of the following laboratory values most strongly indicates the need for temporary external fixation rather than Early Total Care (ETC) for a patient with bilateral femur fractures?

Explanation

A base deficit worse than -6 mEq/L or a serum lactate greater than 4.0 mmol/L are classical markers of physiologic exhaustion and ongoing shock. Proceeding with early total care in these borderline or unstable patients significantly increases the risk of ARDS and multiorgan failure.

Question 23

A 30-year-old male is involved in a high-speed MVC. A Judet obturator oblique radiograph of the pelvis is obtained.

Which of the following acetabular structures are best profiled on this specific radiographic view?

Explanation

The obturator oblique view best profiles the anterior column and the posterior wall of the acetabulum. Conversely, the iliac oblique view highlights the posterior column and the anterior wall.

Question 24

A 28-year-old female presents after a fall from a height of 20 feet. She has a widened mediastinum on chest radiograph, a T12 burst fracture, and flaccid paralysis in her lower extremities. Her vital signs are: BP 85/50 mmHg, HR 65 bpm, RR 18/min. What is the most likely primary cause of her hypotension?

Explanation

The presence of hypotension paired with bradycardia in the setting of a spinal cord injury strongly suggests neurogenic shock, which results from the loss of sympathetic tone. In contrast, hemorrhagic shock typically presents with compensatory tachycardia.

Question 25

During the ilioinguinal approach for an anterior column acetabular fracture, significant hemorrhage is encountered just superior to the superior pubic ramus. This bleeding is most likely originating from a vascular anastomosis between which of the following two systems?

Explanation

The 'Corona Mortis' is a critical, potentially life-threatening vascular anastomosis between the obturator vessels (internal iliac system) and the external iliac or inferior epigastric vessels. It is located over the superior pubic ramus and is at high risk of iatrogenic injury during anterior pelvic approaches.

Question 26

Based on the Lower Extremity Assessment Project (LEAP) study evaluating severe, mangled lower extremity injuries, which of the following statements is true comparing amputation versus limb salvage?

Explanation

The LEAP study demonstrated no significant difference in functional outcomes at 2 and 7 years between patients who underwent amputation versus limb salvage. Both groups experienced high rates of chronic pain and disability, and scoring systems like MESS were not predictive of ultimate functional outcome.

Question 27

A 22-year-old male sustains a closed tibial shaft fracture. Twelve hours post-admission, he develops severe pain out of proportion to the injury. Which of the following pressure criteria is generally accepted as an absolute indication for emergent four-compartment fasciotomy?

Explanation

A Delta P (Diastolic Blood Pressure minus Compartment Pressure) of less than 30 mmHg is the most reliable threshold for diagnosing acute compartment syndrome and warrants emergent fasciotomy. Using absolute pressures is less reliable due to fluctuations in systemic blood pressure.

Question 28

A 45-year-old male sustains a closed pelvic ring injury. Clinical examination reveals a massive, fluctuant swelling over the greater trochanter with intact, but ecchymotic overlying skin. What is the primary pathophysiologic mechanism of this specific soft tissue injury?

Explanation

A Morel-Lavallée lesion is a closed degloving injury caused by traumatic shearing of the subcutaneous tissue away from the underlying deep fascia. This creates a potential space that fills with hematoma and liquefied fat, significantly increasing the risk of deep infection if surgical incisions are placed directly through it.

Question 29

A 24-year-old male is awaiting fixation of bilateral femur fractures. On hospital day 2, he develops acute confusion, tachypnea, and a petechial rash over his axillae. Arterial blood gas shows a PaO2 of 55 mmHg. What is the most appropriate initial management of this condition?

Explanation

The patient is exhibiting classic signs of Fat Embolism Syndrome (FES), diagnosed clinically using Gurd's criteria. The mainstay of treatment is purely supportive, prioritizing oxygenation and mechanical ventilation if necessary; corticosteroids and heparin have not proven consistently beneficial in acute management.

Question 30

A 32-year-old polytrauma patient is in the intensive care unit after damage control orthopedic surgery. Which of the following is the most reliable indicator of adequate global tissue perfusion and the endpoint of resuscitation?

Explanation

Serum lactate and base deficit are the most reliable indicators of global tissue perfusion and successful resuscitation in polytrauma patients. Normalization of these markers correlates with improved survival and guides the timing for definitive fracture fixation.

Question 31

A 45-year-old farmer sustains a Gustilo-Anderson Type IIIB open tibia fracture severely contaminated with manure. According to current guidelines, what is the most appropriate initial intravenous antibiotic regimen?

Explanation

For Type III open fractures with severe soil or farm contamination, the addition of high-dose penicillin is recommended to cover Clostridium species, alongside gram-positive and gram-negative coverage. This minimizes the risk of gas gangrene in high-risk environments.

Question 32

A 28-year-old male presents with a knee dislocation that was successfully reduced in the emergency department. His pedal pulses are palpable, but his ankle-brachial index (ABI) is measured at 0.85. What is the most appropriate next step in management?

Explanation

An ABI less than 0.9 in the setting of a knee dislocation is highly suspicious for a popliteal artery injury, even if pulses are palpable. CT angiography is the gold standard diagnostic step to accurately locate and evaluate the extent of the vascular injury.

Question 33

A 22-year-old male sustains a closed tibial shaft fracture. Two hours post-admission, his blood pressure is 110/60 mmHg, and compartment pressure monitoring reveals an anterior compartment pressure of 40 mmHg. What is the calculated Delta P, and what is the indicated treatment?

Explanation

Delta P is calculated as diastolic blood pressure minus compartment pressure (60 - 40 = 20 mmHg). A Delta P of less than 30 mmHg is an absolute indication for emergency four-compartment fasciotomy of the lower leg to prevent irreversible muscle necrosis.

Question 34

A 55-year-old male presents with an APC-III pelvic ring injury and refractory hypotension. During pre-peritoneal pelvic packing, active arterial bleeding is encountered over the superior pubic ramus. Which vascular structure is most likely injured?

Explanation

The 'corona mortis' is a critical vascular anastomosis between the obturator vessels and the external iliac or inferior epigastric vessels. It crosses the superior pubic ramus and is highly susceptible to injury in anterior pelvic ring fractures.

Question 35

In a patient with a severely mangled lower extremity following an industrial crush injury, which of the following is considered an absolute indication for primary amputation?

Explanation

While severe nerve injuries and massive bone loss are relative indications, a warm ischemia time exceeding 6 hours is widely considered an absolute indication for primary amputation. Prolonged warm ischemia leads to irreversible muscle necrosis and severe reperfusion toxicity.

Question 36

A 38-year-old male falls from a height and sustains a transverse with posterior wall acetabular fracture. Which surgical approach provides the most direct and appropriate access for anatomic reduction and fixation of this specific fracture pattern?

Explanation

The Kocher-Langenbeck approach provides excellent direct exposure to the posterior column and posterior wall. It is the preferred and most commonly utilized approach for transverse with posterior wall acetabular fractures.

Question 37

A 24-year-old male sustains a low-velocity gunshot wound to the thigh, resulting in a comminuted femoral shaft fracture. The entrance and exit wounds are clean and measure approximately 1 cm each. The patient is neurovascularly intact. What is the most appropriate management?

Explanation

Low-velocity gunshot wounds with associated long bone fractures and no significant contamination or vascular injury are treated similarly to closed fractures. Local wound care, short-course IV antibiotics, and standard intramedullary nailing yield excellent outcomes without the need for extensive debridement.

Question 38

A polytrauma patient with bilateral pulmonary contusions and a closed midshaft femur fracture undergoes reamed intramedullary nailing on hospital day 2. Postoperatively, he develops severe hypoxemia, a petechial rash on the axilla, and altered mental status. What is the most likely diagnosis?

Explanation

The classic triad of hypoxemia, neurologic abnormalities, and a petechial rash following intramedullary reaming and fixation of a long bone fracture is highly indicative of fat embolism syndrome. Intramedullary pressurization drives marrow fat into the venous circulation.

Question 39

A 42-year-old roofer falls and sustains a closed, displaced, intra-articular joint depression type calcaneus fracture. The skin is severely swollen with fracture blisters. What is the optimal timing for definitive open reduction and internal fixation (ORIF) via an extensile lateral approach?

Explanation

ORIF of calcaneus fractures should be delayed until soft tissue swelling subsides to minimize catastrophic wound complications. This is indicated by the return of skin wrinkles (the 'wrinkle sign'), which typically occurs 7 to 14 days post-injury.

Question 40

A 29-year-old motorcyclist presents after a high-speed crash with severe left shoulder pain, a completely flail upper extremity, and absent radial and ulnar pulses. Radiographs show a laterally displaced scapula and an intact clavicle. Which neurovascular structure is at highest risk of severe avulsion injury?

Explanation

Scapulothoracic dissociation is characterized by complete disruption of the scapulothoracic articulation. The massive lateral traction force frequently causes severe, often irreversible avulsion injuries to the brachial plexus and the subclavian or axillary vessels.

Question 41

A 31-year-old female sustains a Hawkins Type III talar neck fracture following a severe motor vehicle collision. What is the approximate risk of developing avascular necrosis (AVN) of the talar body?

Explanation

A Hawkins Type III fracture involves displacement of the talar body from both the subtalar and tibiotalar joints. This displacement disrupts all three major blood supplies to the talus, leading to an AVN risk approaching 100%.

Question 42

An 82-year-old female with severe pre-existing osteoarthritis of the knee and profound osteopenia sustains a highly comminuted, displaced intra-articular distal femur fracture (AO/OTA 33-C3). Which surgical option provides the earliest mobilization and most predictable return to function?

Explanation

In elderly patients with poor bone quality, pre-existing osteoarthritis, and severe intra-articular comminution, distal femoral replacement acts as an arthroplasty. It provides immediate stability, allows early weight-bearing, and avoids the high failure rates associated with internal fixation in this demographic.

Question 43

A 40-year-old male sustains a medial tibial plateau fracture with knee subluxation (Schatzker IV) after a high-energy varus-directed force. Which associated injury must be ruled out emergently?

Explanation

Schatzker IV (medial plateau) fractures often involve high-energy trauma with knee subluxation or dislocation. Because the popliteal artery is anatomically tethered at the soleus arch, these injuries carry a high risk of vascular injury requiring emergent evaluation.

Question 44

A 32-year-old male presents with bilateral femur fractures and pulmonary contusions following a motor vehicle collision. Which of the following parameters is the MOST reliable indicator of adequate resuscitation, allowing the surgical team to safely proceed from a damage control approach to early total care (definitive intramedullary nailing)?

Explanation

Serum lactate and base deficit are the most reliable markers of tissue perfusion and adequate resuscitation in polytrauma. Normalization of lactate (< 2.0 mmol/L) indicates resolution of occult hypoperfusion, making early definitive fracture care safer.

Question 45

A hemodynamically unstable 40-year-old female presents with a severe lateral compression (LC) pelvic ring injury. After binder application and fluid resuscitation, she remains hypotensive and is taken for pelvic angiography. Which vessel is most commonly the source of life-threatening arterial hemorrhage in this specific fracture pattern?

Explanation

The superior gluteal artery is the most common source of arterial bleeding in pelvic fractures, particularly those involving posterior pelvic ring disruptions. Anterior injuries (like APC) are more prone to obturator or internal pudendal artery injuries.

Question 46

A 45-year-old construction worker sustains a Gustilo-Anderson Grade IIIA open tibia fracture. According to established orthopedic trauma guidelines, what is the single most important intervention for decreasing the patient's risk of deep bone infection?

Explanation

The time to administration of intravenous antibiotics is the most critical factor in reducing infection rates in open fractures. The historical '6-hour rule' for surgical debridement has been shown to be less strongly correlated with infection risk than immediate antibiotic delivery.

Question 47

A 25-year-old male sustains a closed comminuted tibial shaft fracture. His blood pressure is 110/70 mmHg. He complains of severe pain out of proportion to the injury. Which of the following intracompartmental pressure measurements strictly mandates emergency fasciotomy?

Explanation

A Delta P (diastolic blood pressure minus compartment pressure) of less than 30 mmHg is the accepted threshold for diagnosing acute compartment syndrome and mandates emergency fasciotomy. Absolute pressure readings are less reliable due to variations in systemic blood pressure.

Question 48

A 22-year-old male sustains a low-velocity civilian gunshot wound to the distal thigh. Radiographs demonstrate a non-displaced distal femur fracture. Which of the following findings is an absolute indication for formal surgical debridement of the bullet track?

Explanation

Intra-articular gunshot wounds require formal arthrotomy or arthroscopic debridement to prevent lead arthropathy and septic arthritis. Uncomplicated low-velocity transcavitary wounds without vascular injury or severe contamination can generally be managed with local wound care and antibiotics.

Question 49

When evaluating a severely mangled lower extremity, which of the following clinical findings—historically considered an absolute indication for primary amputation—is now recognized as unreliable for predicting successful limb salvage?

Explanation

Absent plantar sensation on initial presentation is no longer considered an absolute indication for amputation. Studies like the LEAP trial demonstrated that initial lack of sensation does not accurately predict long-term functional recovery or permanent nerve deficit.

Question 50

In a polytraumatized patient with significant bilateral pulmonary contusions, early reamed intramedullary nailing of a femoral shaft fracture (Early Total Care) is most closely associated with an increased risk of developing which complication?

Explanation

Reaming of the femoral canal increases intramedullary pressure, releasing fat emboli into the venous circulation. In a patient with pre-existing lung injury (e.g., pulmonary contusions), this "second hit" significantly increases the risk of ARDS and systemic inflammatory response.

Question 51

A 32-year-old male sustains a Gustilo-Anderson Grade IIIB open tibia fracture with an anterior 10x10 cm soft tissue defect. To minimize the risk of deep infection and osteomyelitis, definitive soft tissue coverage (e.g., free flap) should ideally be performed within what timeframe?

Explanation

Godina's classic principles, supported by modern studies, demonstrate that soft tissue coverage within 3 to 7 days (the "fix and flap" window) minimizes infection rates and flap failure. Delaying coverage beyond this period increases colonization and deep infection risks.

Question 52

A 28-year-old male sustained a Hawkins Type III talar neck fracture. At 8 weeks post-fixation, an AP radiograph of the ankle demonstrates a subchondral radiolucent band in the dome of the talus (Hawkins sign). What does this specific radiographic finding indicate?

Explanation

The Hawkins sign is a subchondral radiolucent band representing subchondral osteopenia secondary to disuse. Its presence indicates that the vascular supply to the talar body is intact, effectively ruling out avascular necrosis.

Question 53

A patient with a complex bicondylar tibial plateau fracture requires an open reduction and internal fixation of a displaced posteromedial fragment. During a standard posteromedial approach, which neurovascular structures are at greatest risk of iatrogenic injury during superficial dissection?

Explanation

The posteromedial approach to the tibial plateau uses the interval between the pes anserinus and the medial head of the gastrocnemius. The saphenous nerve and great saphenous vein lie in the superficial fascia of this region and must be carefully protected.

Question 54

A 19-year-old male involved in a high-speed collision presents with massive shoulder swelling and an AP chest radiograph demonstrating marked lateral displacement of the scapula. What is the most devastating, immediately life-threatening or limb-threatening associated injury that must be ruled out?

Explanation

Scapulothoracic dissociation is a severe, high-energy injury characterized by lateral displacement of the scapula. It is frequently associated with catastrophic traction injuries to the subclavian or axillary artery and the brachial plexus.

Question 55

A 22-year-old male sustains an isolated posterior hip dislocation in a dashboard injury. To optimally reduce the risk of avascular necrosis (AVN) of the femoral head, a stable, closed reduction should ideally be accomplished within what strict timeframe?

Explanation

Hip dislocations are orthopedic emergencies. Evidence consistently shows that reducing a dislocated hip within 6 hours significantly decreases the risk of avascular necrosis of the femoral head and long-term joint degeneration.

Question 56

A 45-year-old presents with a high-energy supracondylar distal femur fracture. Which imaging modality or specific sequence is most critical to effectively rule out an associated coronal plane articular (Hoffa) fracture?

Explanation

Hoffa fractures are coronal plane fractures of the femoral condyles that are frequently missed on standard AP radiographs. A CT scan with 2D reconstructions is the gold standard for identifying and characterizing these intra-articular injuries.

Question 57

When applying a temporary spanning external fixator for a proximal tibia fracture in a polytrauma patient, half-pins placed in the anterior tibial diaphysis should be placed slightly medial to the anterior tibial crest to avoid injury to which anatomical compartment/structure?

Explanation

The safe corridor for pin placement in the tibial diaphysis is the anteromedial face. Placing pins lateral to the tibial crest risks injury to the anterior compartment musculature (tibialis anterior) and the deep peroneal nerve.

Question 58

A 35-year-old roof worker falls from a height and sustains a severely displaced, intra-articular calcaneus fracture. Assessment of Böhler's angle on a standard lateral foot radiograph will typically demonstrate which of the following?

Explanation

Böhler's angle is normally between 20 and 40 degrees. In displaced intra-articular calcaneus fractures, the collapse of the posterior facet and tuberosity results in a decrease, flattening, or even a negative Böhler's angle.

Question 59

An 82-year-old female presents with a displaced femoral neck fracture. She has a history of stable coronary artery disease. According to extensive registry data and current guidelines, what is the optimal timing for surgical intervention to minimize 1-year mortality?

Explanation

Delaying surgery for geriatric hip fractures beyond 48 hours is associated with significantly increased morbidity and 1-year mortality. Medical optimization should occur concurrently, but surgery should not be unnecessarily delayed for routine cardiac testing if the patient is stable.

Question 60

A 24-year-old athlete presents with midfoot pain after an axial load to a plantarflexed foot. Radiographs reveal a subtle widening of the first intermetatarsal space and a 'fleck sign'. This pathognomonic finding represents an osseous avulsion of the Lisfranc ligament. Which two structures does this ligament connect?

Explanation

The Lisfranc ligament is a strong interosseous ligament that connects the lateral aspect of the medial cuneiform to the medial base of the second metatarsal. A 'fleck sign' indicates an avulsion fracture at its insertion.

Question 61

A 45-year-old male is 9 months post-intramedullary nailing for a tibial shaft fracture. He complains of persistent pain with weight-bearing. Radiographs show a persistent fracture line with abundant, dense 'elephant shoe' callus formation. What is the most appropriate next step in management?

Explanation

An 'elephant shoe' callus represents a hypertrophic nonunion, which implies excellent local biology but inadequate mechanical stability. Exchange nailing provides increased mechanical stability, which is the definitive treatment to achieve union in this scenario.

Question 62

A 25-year-old male with an isolated closed femur fracture becomes acutely confused and tachypneic 36 hours after admission. Physical examination reveals a petechial rash over his axilla and conjunctiva. Arterial blood gas shows severe hypoxemia. What is the most likely diagnosis?

Explanation

Fat embolism syndrome (FES) classically presents 24 to 72 hours after long bone fractures with a triad of hypoxemia, neurological abnormalities, and a petechial rash. Early fracture fixation is the most effective prophylaxis.

Question 63

A 28-year-old polytrauma patient develops petechial rashes over the axilla, conjunctiva, and chest 48 hours after sustaining bilateral femur fractures. He is tachypneic and confused. According to Gurd's criteria, which of the following is considered a major criterion for the diagnosis of Fat Embolism Syndrome (FES)?

Explanation

Gurd's major criteria for Fat Embolism Syndrome include petechial rash, respiratory insufficiency, and cerebral involvement. Fever, tachycardia, thrombocytopenia, and anemia are considered minor criteria.

Question 64

A 34-year-old male presents with a posterolateral knee dislocation after a high-energy trauma. The joint is emergently reduced. Post-reduction, the distal pulses are palpable, but the Ankle-Brachial Index (ABI) is calculated to be 0.8. What is the most appropriate next step in management?

Explanation

An ABI less than 0.9 following a knee dislocation is highly suspicious for a vascular injury, even if pulses are palpable. A CT angiogram is indicated to evaluate for an intimal tear or occlusion of the popliteal artery.

Question 65

In the context of Damage Control Orthopedics (DCO), which of the following physiological parameters is the most reliable indicator of adequate resuscitation, allowing for safe transition to early total care (ETC) for a femur fracture?

Explanation

Clearance of serum lactate to less than 2.0 mmol/L (or normal base excess) is an objective marker of restored tissue perfusion. It is widely considered the best indicator of adequate resuscitation before undertaking definitive intramedullary nailing.

Question 66

Which of the following interventions has been proven to be the most critical factor in reducing the risk of deep infection in the management of open long bone fractures?

Explanation

The early administration of appropriate systemic antibiotics is the single most critical and evidence-based factor for reducing infection in open fractures. The traditional '6-hour rule' for operative debridement has been challenged by recent literature.

Question 67

A 45-year-old male sustains an acetabular fracture. Radiographs including AP and Judet views reveal disruption of the iliopectineal line extending to the anterior iliac crest, with an intact ilioischial line. Based on the Letournel classification, what is the diagnosis?

Explanation

Disruption of the iliopectineal line characterizes an anterior column injury. Extension to the iliac crest further confirms a high anterior column fracture, distinguishing it from an isolated anterior wall fracture.

Question 68

A 22-year-old intubated trauma patient is hypotensive with a diastolic blood pressure of 55 mmHg. His right leg is tense and swollen following a severe crush injury. Intracompartmental pressure monitoring reveals a pressure of 30 mmHg. What is the most appropriate next step?

Explanation

Compartment syndrome is diagnosed when the Delta P (diastolic BP minus compartment pressure) is less than 30 mmHg. In this hypotensive patient, a Delta P of 25 mmHg (55 - 30) mandates emergent fasciotomy.

Question 69

A patient presents with a vertical shear pelvic ring disruption after a fall from a height. Which of the following arterial structures is at the highest risk of injury with this specific fracture pattern?

Explanation

Vertical shear pelvic fractures involve significant posterior ring disruption, placing the superior gluteal artery at highest risk as it exits the greater sciatic notch. Anterior-posterior compression injuries typically affect the internal pudendal and obturator arteries.

Question 70

A 30-year-old patient with a complete cervical spine cord injury presents to the emergency department hypotensive and bradycardic, with warm extremities. Which type of shock is this patient experiencing?

Explanation

Neurogenic shock is characterized by hypotension, bradycardia, and warm extremities due to the loss of sympathetic vascular tone. Spinal shock refers to the temporary loss of spinal reflexes below the level of injury and is not a hemodynamic state.

Question 71

A motorcyclist is ejected and sustains a closed, pulseless, completely flail upper extremity. Chest radiographs demonstrate severe lateral displacement of the scapula. What is the most commonly associated vascular injury in this condition?

Explanation

Scapulothoracic dissociation is a devastating traction injury to the shoulder girdle. The subclavian artery and the brachial plexus are the most commonly injured neurovascular structures due to severe lateral traction.

Question 72

A 55-year-old male sustains a high-energy Schatzker VI tibial plateau fracture. Which characteristic of this fracture pattern most significantly increases the risk of developing acute compartment syndrome?

Explanation

Metaphyseal-diaphyseal dissociation (Schatzker VI) involves significant energy transfer and severe soft tissue disruption, greatly increasing the risk of acute compartment syndrome compared to simple split or depressed plateau fractures.

Question 73

A 78-year-old female on chronic warfarin therapy sustains a displaced femoral neck fracture. Her admission INR is 3.5. To facilitate urgent surgical intervention within 24 hours, what is the best agent for rapid reversal of her anticoagulation?

Explanation

Prothrombin Complex Concentrate (PCC) is the preferred agent for rapid, reliable reversal of vitamin K antagonists like warfarin in urgent surgical scenarios. It works faster and has lower volume overload risks compared to FFP.

Question 74

A 25-year-old male sustains a low-velocity civilian gunshot wound to the thigh, resulting in a non-comminuted, midshaft femur fracture. The neurovascular exam is intact. What is the most appropriate management?

Explanation

Low-velocity gunshot wounds to the femur without massive soft tissue destruction can be safely managed with local wound care, tetanus/antibiotic prophylaxis, and immediate intramedullary nailing. Formal wide debridement of the tract is unnecessary.

Question 75

A 29-year-old male sustains a 'floating knee' injury (ipsilateral femur and tibia fractures) in a motor vehicle collision. Which of the following associated local injuries has the highest incidence of initially being missed in this patient?

Explanation

Ligamentous injuries to the knee (especially ACL and collateral ligaments) are present in up to 50% of floating knee injuries but are frequently missed during initial evaluation due to the overriding long bone instability.

Question 76

When evaluating a severely crushed lower extremity for salvage versus amputation, the Mangled Extremity Severity Score (MESS) is often referenced. Which of the following is NOT a component of the MESS?

Explanation

The MESS evaluates skeletal/soft-tissue injury, limb ischemia, shock, and patient age. Although major nerve injuries (e.g., tibial nerve) strongly influence the clinical decision for amputation, it is not a direct numerical component of the MESS.

Question 77

A 72-year-old female on prolonged oral bisphosphonates presents with unremitting anterior thigh pain. Radiographs reveal focal lateral cortical thickening (the 'beak' sign) and a transverse radiolucent line in the proximal third of the femur. What is the prophylactic treatment of choice?

Explanation

Atypical femur fractures associated with bisphosphonate use often present as a symptomatic incomplete fracture on the tension (lateral) side. Prophylactic cephalomedullary nailing is the standard of care to prevent a catastrophic complete fracture.

Question 78

A patient with a severe open tibia fracture (Gustilo-Anderson IIIB) undergoes serial debridement. According to Godina's classic principles, free tissue transfer is associated with the lowest failure and infection rates when performed within what timeframe?

Explanation

Godina demonstrated that free flap coverage of severe extremity injuries performed within 72 hours of injury results in significantly lower flap failure and deep infection rates compared to delayed coverage.

Question 79

A trauma patient undergoes pelvic radiography. The obturator oblique view of the Judet series reveals a pathognomonic 'spur sign'. This radiographic finding is specifically associated with which of the following acetabular fracture patterns?

Explanation

The 'spur sign' is pathognomonic for a both-column acetabular fracture. It represents the remaining intact portion of the ilium attached to the axial skeleton, which projects posteriorly on the obturator oblique radiograph.

Question 80

A 38-year-old male sustains a severe pelvic crush injury. He develops a large, fluctuant swelling over the greater trochanter. Aspiration yields serosanguinous fluid. What is the most appropriate definitive management of this Morel-Lavallée lesion to minimize infection prior to pelvic fixation?

Explanation

A Morel-Lavallée lesion is a closed degloving injury that traps necrotic fat and hematoma, posing a high risk for subsequent surgical site infection. Formal open debridement (or extensive percutaneous debridement) with delayed closure is the safest approach before internal fixation.

Question 81

A 50-year-old male presents with an enlarging, painful anterior leg mass 15 years after a conservatively managed tibia fracture with a history of missed compartment syndrome. Imaging shows a fusiform mass with peripheral calcification. Biopsy shows necrotic muscle. What is the best management?

Explanation

The patient has calcific myonecrosis, a rare late complication of compartment syndrome. Because surgical excision frequently results in chronic non-healing wounds and secondary infection, observation and symptomatic treatment are highly recommended.

Question 82

In a hypotensive trauma patient with severe pelvic hemorrhage unresponsive to initial massive transfusion and pelvic binding, Resuscitative Endovascular Balloon Occlusion of the Aorta (REBOA) is planned. In which aortic zone should the balloon be inflated to best control pelvic hemorrhage?

Explanation

For isolated, life-threatening pelvic hemorrhage, the REBOA balloon should be deployed in Zone 3 (from the lowest renal artery down to the aortic bifurcation). Zone 1 is used for suspected intra-abdominal bleeding, and Zone 2 is a non-deployment evasion zone.

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