This practice set contains high-yield board review questions covering key concepts in 2. Trauma. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.
Question 11701
Topic: Lower Extremity Trauma
The anterolateral ligament (ALL) of the knee is an important secondary stabilizer against internal tibial rotation. It originates near the lateral femoral epicondyle. What is its precise anatomical insertion on the tibia?
Correct Answer & Explanation
. Midway between Gerdy's tubercle and the fibular head
Explanation
The anterolateral ligament (ALL) originates from the lateral femoral epicondyle (slightly anterior and distal to the FCL origin) and inserts on the lateral tibial plateau, exactly midway between Gerdy's tubercle and the fibular head. It is deep to the iliotibial band.
Question 11702
Topic: 2. Trauma
Volar forearm compartment syndrome often necessitates an extensive fasciotomy. The deep volar compartment contains muscles responsible for distal digital flexion. Which of the following muscles is exclusively located within the deep volar compartment of the forearm?
Correct Answer & Explanation
. Flexor pollicis longus
Explanation
The volar forearm is divided into superficial and deep compartments. The deep volar compartment consists of the Flexor Pollicis Longus (FPL), Flexor Digitorum Profundus (FDP), and Pronator Quadratus (PQ). FDS, FCU, PT, and PL are in the superficial/intermediate compartments.
Question 11703
Topic: 2. Trauma
The scaphoid is highly susceptible to avascular necrosis following fracture due to its unique retrograde blood supply. Which of the following best describes the predominant intraosseous vascular pattern of the scaphoid?
Correct Answer & Explanation
. Vessels enter dorsally along the non-articular ridge and course from distal to proximal
Explanation
Approximately 70-80% of the scaphoid (including the entire proximal pole) is supplied by the dorsal carpal branch of the radial artery. These vessels enter along the dorsal non-articular ridge at the scaphoid waist and course retrogradely (from distal to proximal) inside the bone, predisposing proximal pole fractures to ischemia.
Question 11704
Topic: 2. Trauma
A 22-year-old male sustains a proximal pole scaphoid fracture. The risk of nonunion and avascular necrosis (AVN) is high due to the unique retrograde blood supply. The primary blood supply to the scaphoid enters at which anatomical location, and from which artery is it derived?
Correct Answer & Explanation
. Dorsal ridge distally; Radial artery
Explanation
The primary blood supply to the scaphoid (providing 70-80% of its vascularity) is derived from branches of the radial artery entering via the dorsal ridge located at the distal aspect of the bone. This blood supply runs in a retrograde fashion to nourish the proximal pole, making proximal pole fractures particularly susceptible to AVN.
Question 11705
Topic: 2. Trauma
Which of the following is an absolute contraindication to intramedullary nailing of a femoral shaft fracture?
Correct Answer & Explanation
. Active systemic infection (e.g., sepsis) originating from a distant source.
Explanation
The primary absolute contraindication to intramedullary nailing (IMN) of a femoral shaft fracture is an active infection in the operative field. An active systemic infection (e.g., sepsis) originating from a distant source is a strong relative contraindication, as it increases the risk of hematogenous seeding and subsequent implant infection, making it the most correct answer among the choices. Option A (open Gustilo IIIB) is a complex scenario, but after thorough debridement, external fixation with planned delayed IMN is common, not an absolute contraindication. Ipsilateral severe knee ligamentous injury (B) is a concern for surgical approach and potential complications but not an absolute contraindication to IMN. Severely comminuted fracture patterns (D) are often managed well with IMN. Associated TBI (E) is a relative contraindication to immediate surgery due to potential hemodynamic instability or increased intracranial pressure, but not an absolute contraindication to IMN as a fixation method.
Question 11706
Topic: 2. Trauma
A 70-year-old female presents with a displaced intra-articular calcaneal fracture. She has multiple comorbidities including severe osteoporosis. What is the most significant long-term complication unique to intra-articular calcaneal fractures, even with optimal surgical management?
Correct Answer & Explanation
. Malunion leading to subtalar arthritis.
Explanation
The most significant long-term complication unique to intra-articular calcaneal fractures, particularly after surgical management, is post-traumatic subtalar arthritis (B). Despite achieving anatomical reduction and stable fixation, the high-energy nature of the injury and damage to the articular cartilage often lead to degenerative changes in the subtalar joint. This can result in chronic pain, stiffness, and impaired gait, often necessitating a subtalar fusion as a salvage procedure. While DVT (A), wound infection (C), and CRPS (D) are all possible complications, they are not unique to intra-articular calcaneal fractures in the same way subtalar arthritis is. Nonunion (E) is rare in calcaneal fractures.
Question 11707
Topic: Pelvic & Acetabular Trauma
A 25-year-old male sustains a posterior hip dislocation. After successful closed reduction, what is the most important imaging study to obtain and why?
Correct Answer & Explanation
. CT scan of the hip to rule out incarcerated fragments and evaluate concentric reduction.
Explanation
After closed reduction of a posterior hip dislocation, a CT scan of the hip (B) is essential. It serves two critical purposes: 1) to confirm concentric reduction of the femoral head within the acetabulum, and 2) to rule out incarcerated intra-articular fragments (e.g., osteochondral fragments from the femoral head or acetabulum) that would necessitate open reduction. Failure to identify and remove such fragments significantly increases the risk of post-traumatic arthritis and loss of reduction. Repeat plain radiographs (C) are usually obtained immediately after reduction but are insufficient to rule out small incarcerated fragments. MRI (A) and angiography (D) are typically not the immediate next step, and bone scan (E) is for delayed complications like AVN.
Question 11708
Topic: Pelvic & Acetabular Trauma
Which of the following physical examination findings is most suggestive of an unstable lateral compression (LC-II) pelvic ring injury?
Correct Answer & Explanation
. Unilateral anterior superior iliac spine (ASIS) tenderness with rotational instability.
Explanation
A Young-Burgess Lateral Compression Type II (LC-II) pelvic ring injury is characterized by an internal rotation force causing an anterior injury (e.g., pubic rami fractures) and a posterior injury involving the ipsilateral sacroiliac joint or sacrum, often with a crescent fracture of the iliac wing. Rotational instability (E), often detected by gently compressing the iliac wings laterally (provocative stress test), is the key indicator of an unstable lateral compression injury. Sacral tenderness (A) is general for posterior injury. Blood at the urethral meatus (B) suggests urethral injury, which can be associated but isn't specific for LC-II mechanical instability. Faber test (C) is for hip pathology. Pain with internal rotation of the hip (D) is non-specific.
Question 11709
Topic: 2. Trauma
A 40-year-old male presents with a Grade III open tibia shaft fracture sustained in a motor vehicle accident. He also has a severe closed head injury. The patient is intubated and sedated. During the initial debridement, you note a large segment of bone is missing (segmental bone loss). What is the most appropriate initial management strategy for the bone defect?
Correct Answer & Explanation
. Insertion of an antibiotic cement spacer.
Explanation
In the setting of a Grade III open tibia fracture with significant bone loss in a polytrauma patient (severe head injury), the immediate priority is wound debridement, infection control, and temporary stabilization. An antibiotic cement spacer (C) is an excellent initial strategy for managing segmental bone loss in an open fracture. It helps maintain the bone defect space, delivers high local concentrations of antibiotics, and acts as a placeholder for future definitive bone reconstruction (e.g., bone grafting, bone transport). Immediate cancellous bone grafting (A) is generally contraindicated in an acute open wound due to high infection risk. Circular external fixators for bone transport (B) are for definitive management, not initial. Primary shortening (E) might be considered for very small defects but not for large segmental loss and can lead to leg length discrepancy. The strategy is damage control: debride, stabilize, prevent infection, and plan for reconstruction.
Question 11710
Topic: 2. Trauma
Which of the following is the most sensitive and specific clinical finding for diagnosing acute compartment syndrome in an awake and alert patient with a tibia fracture?
Correct Answer & Explanation
. Pain out of proportion to the injury.
Explanation
Pain out of proportion to the injury (C) and pain with passive stretch of the muscles in the affected compartment are the most sensitive and specific clinical signs of acute compartment syndrome in an awake and alert patient. While paresthesia (A) and weakness (B) are late signs of nerve ischemia and muscle necrosis, respectively, they indicate advanced compartment syndrome. Absence of distal pulses (D) is rare and a very late sign, indicating arterial occlusion, not typically compartment syndrome. Pallor (E) is also a late, less reliable sign. The key is recognizing the escalating pain, especially with passive stretch, which prompts compartment pressure measurements for definitive diagnosis.
Question 11711
Topic: 2. Trauma
In a patient with a closed intertrochanteric fracture of the femur, which factor is most crucial in deciding between intramedullary nailing and a sliding hip screw fixation?
Correct Answer & Explanation
. Integrity of the lateral femoral wall.
Explanation
The integrity of the lateral femoral wall (C) is a critical factor in determining the stability and success of fixation for intertrochanteric fractures, particularly when considering a sliding hip screw (SHS). A compromised lateral wall (e.g., reverse obliquity, large posterolateral fragment) can lead to medial migration of the femoral shaft relative to the head-neck segment, leading to loss of reduction and cut-out with an SHS. In such unstable fractures, an intramedullary nail provides better biomechanical stability. Comminution of the lesser trochanter (B) is a sign of instability but less critical than the lateral wall for SHS specifically. Age (A), osteoporosis (D), and activity level (E) influence choice but are secondary to fracture pattern stability.
Question 11712
Topic: 2. Trauma
A 68-year-old male with multiple comorbidities sustains an unstable intertrochanteric hip fracture. He is deemed a poor surgical candidate for general anesthesia for definitive fixation. What is the most appropriate non-operative management approach?
Correct Answer & Explanation
. Pain control and bed rest with progressive mobilization as tolerated.
Explanation
For an elderly, unstable intertrochanteric hip fracture patient deemed too high risk for definitive surgical fixation, the goal of non-operative management shifts from achieving anatomical reduction and union to minimizing complications of prolonged immobility while providing comfort. Prolonged bed rest (D) and skeletal traction (A) lead to high rates of complications like pneumonia, DVT, pressure ulcers, and accelerated deconditioning. Hip spica cast (B) is poorly tolerated and ineffective in adults. Percutaneous pinning (E) still involves anesthesia risks and might not be stable enough for early mobilization. The most appropriate non-operative approach emphasizes pain control and progressive mobilization as tolerated, accepting a likely malunion or nonunion but prioritizing patient comfort and prevention of life-threatening complications related to immobility. It's a palliative approach. This option (D) is better than C, as early mobilization with non-weight-bearing is difficult and can lead to displacement.
Question 11713
Topic: 2. Trauma
A 20-year-old male presents with a high-energy distal tibia (Pilon) fracture with significant articular comminution. He is initially managed with external fixation. After 10 days, the soft tissue swelling has subsided ('wrinkle sign'). What is the ideal surgical approach for definitive open reduction and internal fixation of this fracture?
Correct Answer & Explanation
. Anterolateral approach.
Explanation
The anterolateral approach (D) is often favored for definitive ORIF of Pilon fractures, especially those involving the anterior or lateral plafond. It provides excellent visualization of the distal tibia articular surface, allows for reduction of impacted fragments, and offers a safe interval between the tibialis anterior and peroneal tendons. The anteromedial approach (A) is also used but can be limited in visualizing the entire articular surface. The direct anterior approach (C) risks injury to neurovascular structures. Posterolateral (B) and medial (E) approaches are typically reserved for specific fracture patterns or associated posterior malleolar fractures.
Question 11714
Topic: 2. Trauma
A 45-year-old male sustains a traumatic amputation of the right leg just proximal to the ankle joint. The decision is made for replantation. What is the most critical time limit for successful replantation of a lower extremity, particularly regarding warm ischemia time?
Correct Answer & Explanation
. 6 hours.
Explanation
For lower extremity replantation, the critical warm ischemia time is typically considered to be 6 hours (C). Beyond this, muscle viability significantly decreases, leading to higher rates of complications such as rhabdomyolysis, compartment syndrome, infection, and ultimately, replantation failure. While cold ischemia can extend this window (up to 12-24 hours if the limb is properly cooled and preserved), the question specifically asks about warm ischemia. Compared to upper extremities (especially digits), lower extremities have a larger muscle mass, making them more susceptible to ischemic damage.
Question 11715
Topic: 2. Trauma
A 38-year-old male presents with a Gustilo-Anderson IIIA open tibia shaft fracture. After initial debridement and external fixation, the wound is clean but cannot be closed primarily. What is the most appropriate next step in soft tissue management within the first week?
Correct Answer & Explanation
. Vacuum-assisted closure (VAC) therapy.
Explanation
For a Gustilo-Anderson IIIA open tibia fracture where primary closure is not possible and the wound is clean after debridement, vacuum-assisted closure (VAC) therapy (D) is an excellent temporizing measure. It promotes wound bed preparation, reduces edema, and encourages granulation tissue formation. This makes the wound more amenable to definitive closure or coverage (e.g., skin graft, local flap) within the first 7-10 days. Delayed primary closure (A) is for wounds that can be closed but are left open initially. Skin grafts (B) are generally not appropriate over exposed bone or tendon. Local flaps (C) and free tissue transfer (E) are definitive coverage options, but VAC prepares the wound for these, and it's less common to jump straight to these within the first week without wound bed optimization.
Question 11716
Topic: 2. Trauma
Which of the following is the most important factor to consider when deciding on the timing of definitive surgical fixation for an acetabular fracture in a stable patient?
Correct Answer & Explanation
. Soft tissue envelope condition.
Explanation
For acetabular fractures, the 'window of opportunity' for optimal surgical fixation is generally considered to be within 7-10 days, provided the soft tissue envelope allows. However, the most critical factor influencing timing is the condition of the soft tissue envelope (E). Excessive swelling, fracture blisters, or open wounds necessitate delay to allow soft tissue recovery, as immediate surgery in these conditions significantly increases the risk of wound complications and infection. While fracture pattern (B) and marginal impaction (C) dictate surgical approach and technique, and patient age (A) can influence recovery, soft tissue condition is the primary determinant ofwhensurgery can safely proceed. Quality of reduction with traction (D) is good for temporary stabilization, but not definitive for timing.
Question 11717
Topic: 2. Trauma
A 40-year-old male presents with a high-energy tibial shaft fracture with significant comminution. He underwent intramedullary nailing. Six months post-operatively, he has persistent pain, swelling, and purulent discharge from the surgical site. Cultures are positive for Staphylococcus aureus. What is the most appropriate management strategy?
Correct Answer & Explanation
. Hardware removal, irrigation, debridement, and IV antibiotics, with or without re-fixation.
Explanation
This patient has a chronic post-operative osteomyelitis around the intramedullary nail (IMN). In the presence of purulent discharge and positive cultures, hardware removal, thorough irrigation and debridement, and targeted intravenous antibiotics (D) are generally required to eradicate the infection. Re-fixation (e.g., with an external fixator or a new IMN after a 'washout' period) is often necessary to maintain stability and promote healing, depending on the fracture stability. Long-term oral antibiotics (A) or suppressive antibiotics with implant retention (B) are usually insufficient for active hardware-associated infection. Irrigation and debridement with hardware retention (C) may be considered for acute infections or early post-op but not typically for chronic purulent infections around an IMN. External fixation with IMN removal and observation (E) may provide stability, but the focus needs to be on eradicating the infection.
Question 11718
Topic: 2. Trauma
What is the most common cause of malunion following a surgically treated distal tibia fracture?
Correct Answer & Explanation
. Rotational malalignment.
Explanation
Rotational malalignment (C) is a common and functionally significant cause of malunion following surgically treated distal tibia (shaft or pilon) fractures. Even small degrees of internal or external rotation can lead to significant gait abnormalities, knee or ankle pain, and increased stresses on adjacent joints. While other factors (A, B, D, E) can contribute to complications, rotational malalignment is often a subtle yet critical parameter that, if not addressed during surgery, leads to functional impairment. Inadequate debridement (A) is for open fractures. Premature weight-bearing (B) can lead to loss of reduction or hardware failure. Insufficient fixation (D) can cause nonunion or displacement. Infection (E) can cause nonunion.
Question 11719
Topic: 2. Trauma
A 30-year-old male presents with a closed femoral shaft fracture following a motorcycle accident. He also has a mid-shaft radius fracture on the ipsilateral arm. He is hemodynamically stable. What is the preferred method of definitive fixation for his femoral shaft fracture?
Correct Answer & Explanation
. Reamed intramedullary nailing.
Explanation
Reamed intramedullary nailing (D) is generally considered the gold standard for definitive fixation of most adult femoral shaft fractures. Reaming allows for a larger diameter nail, which provides greater biomechanical strength and stability, and improves cortical contact for faster healing. While unreamed nailing (E) can be used in certain situations (e.g., severe polytrauma with pulmonary compromise, open fractures to minimize emboli), reamed nailing is preferred for stable, closed fractures in otherwise healthy individuals. Plate fixation (A) is typically reserved for nonunion, peri-prosthetic fractures, or fractures with extensive soft tissue damage where IMN is not feasible. External fixation (B) is usually temporary. Flexible nailing (C) is primarily for pediatric femur fractures.
Question 11720
Topic: 2. Trauma
A 28-year-old male sustains an open Gustilo-Anderson IIIC proximal tibia fracture with an associated popliteal artery injury. After vascular repair, what is the most appropriate method for initial skeletal stabilization?
Correct Answer & Explanation
. A circular external fixator.
Explanation
A Gustilo-Anderson IIIC proximal tibia fracture means severe soft tissue damage, significant contamination, and an associated vascular injury. After vascular repair, skeletal stabilization is crucial. A circular external fixator (e.g., Ilizarov or Taylor Spatial Frame) (D) is often the preferred method for initial stabilization of such complex proximal tibia fractures. It allows for definitive stabilization, helps protect the vascular repair, permits easy wound access for debridement and soft tissue management, and can be used for bone transport or deformity correction if bone loss or malunion occurs. Plates (A) and intramedullary nailing (B) are generally contraindicated due to the severe soft tissue damage, high infection risk, and the need for ongoing wound care. An ankle-spanning external fixator (C) provides temporary stability but is not ideal for proximal tibia fractures and is not a definitive fixation. Skeletal traction (E) is a temporary measure and inadequate for definitive stabilization.
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