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 7601
Topic: 2. Trauma
A 30-year-old polytrauma patient develops petechiae, confusion, and hypoxemia 48 hours after sustaining bilateral femur fractures. What is the most likely underlying pathophysiologic mechanism for this syndrome?
Correct Answer & Explanation
. Deep vein thrombosis causing a pulmonary embolus
Explanation
The classic triad of Fat Embolism Syndrome (FES) includes hypoxemia, neurologic abnormalities, and a petechial rash. It is caused by fat emboli creating both mechanical occlusion and biochemical endothelial injury.
Question 7602
Topic: Lower Extremity Trauma
A 38-year-old man undergoes open reduction and internal fixation of a Schatzker IV (medial) tibial plateau fracture.
Which surgical approach is most appropriate for direct visualization and buttress plating of the posteromedial fragment?
Correct Answer & Explanation
. Anterolateral approach
Explanation
The posteromedial approach allows direct visualization and application of an anti-glide or buttress plate to the apex of the posteromedial fragment, effectively resisting the shear forces.
Question 7603
Topic: 2. Trauma
A 22-year-old male presents with a highly comminuted, severely shortened distal radius fracture and an associated ipsilateral diaphyseal ulna fracture after a high-speed motorcycle crash. He requires multiple surgeries for other life-threatening injuries. What is the most appropriate temporary or definitive construct for the wrist?
Correct Answer & Explanation
. Dorsal spanning bridge plate
Explanation
A dorsal spanning bridge plate is ideal for highly comminuted distal radius fractures or in polytrauma patients requiring immediate upper extremity weight-bearing and rapid surgical stabilization.
Question 7604
Topic: 2. Trauma
A 35-year-old male requires open reduction and internal fixation of a displaced posteromedial tibial plateau fracture. A posteromedial approach is utilized. Which of the following structures is at greatest risk of iatrogenic injury during the superficial dissection?
Correct Answer & Explanation
. Common peroneal nerve
Explanation
The posteromedial approach to the tibial plateau utilizes an interval between the medial gastrocnemius and the pes anserinus. The great saphenous vein and saphenous nerve are superficial structures at high risk during the initial dissection.
Question 7605
Topic: 2. Trauma
A 25-year-old multiply injured patient is brought to the trauma bay after a motorcycle collision. He has bilateral femur fractures and a severe closed head injury. Which of the following physiological markers is the most reliable indicator of adequate global tissue perfusion and resuscitation prior to proceeding with Early Total Care (ETC)?
Correct Answer & Explanation
. Urine output greater than 30 mL/hr
Explanation
Clearance of serum lactate (to < 2.5 mmol/L) and normalization of base deficit are the most reliable indicators of adequate tissue resuscitation. Relying solely on vital signs or urine output can mask compensated shock.
Question 7606
Topic: 2. Trauma
A 32-year-old male sustains a Schatzker VI bicondylar tibial plateau fracture. Twelve hours post-admission, he develops severe, unrelenting leg pain exacerbated by passive stretch of the great toe. Intra-compartmental pressure monitoring reveals a pressure of 45 mm Hg in the anterior compartment, with a diastolic blood pressure of 60 mm Hg. What is the most appropriate next step in management?
Correct Answer & Explanation
. Elevate the leg above the level of the heart
Explanation
The patient is exhibiting signs of acute compartment syndrome with an absolute pressure of 45 mm Hg and a Delta P (diastolic BP - compartment pressure) of 15 mm Hg. A Delta P less than 30 mm Hg is an absolute indication for emergent 4-compartment fasciotomy.
Question 7607
Topic: 2. Trauma
In the initial management of a hemodynamically unstable polytrauma patient with an open-book pelvic ring injury (APC III), a pelvic binder is applied. To achieve optimal mechanical closure of the pelvic volume, the binder should be centered over which of the following anatomic landmarks?
Correct Answer & Explanation
. Anterior superior iliac spines
Explanation
Pelvic binders must be centered over the greater trochanters to effectively close the pelvic ring and reduce pelvic volume. Placement over the iliac crests or ASIS is less effective and can paradoxically open the true pelvis further.
Question 7608
Topic: 2. Trauma
A 45-year-old male presents with a severely displaced bicondylar tibial plateau fracture and massive soft tissue swelling with fracture blisters over the anterolateral and medial aspects of the proximal leg. What is the most appropriate initial management of this fracture?
Correct Answer & Explanation
. Immediate dual plating through a single anterior incision
Explanation
In the presence of severely compromised soft tissue envelopes (massive swelling, fracture blisters), temporary spanning external fixation is indicated. This stabilizes the fracture while allowing the soft tissues to recover, preventing devastating wound complications from early open surgery.
Question 7609
Topic: 2. Trauma
A 22-year-old male sustains closed bilateral femur fractures in an ATV accident. On post-admission day 2, he develops acute hypoxia, a petechial rash over his axillae, and confusion. Which of the following interventions is the most effective definitive method to prevent the development of this syndrome?
Correct Answer & Explanation
. Prophylactic administration of high-dose corticosteroids
Explanation
The patient has Fat Embolism Syndrome, characterized by the classic triad of hypoxemia, neurological abnormalities, and petechial rash. Early operative stabilization (within 24 hours) of long bone fractures is the most effective method for decreasing the incidence of this syndrome.
Question 7610
Topic: 2. Trauma
A 42-year-old female sustains a split-depression lateral tibial plateau fracture (Schatzker type II). During surgical fixation, a submeniscal arthrotomy is performed. Which of the following intra-articular injuries is most frequently encountered with this specific fracture pattern?
Correct Answer & Explanation
. Medial meniscus tear
Explanation
Lateral meniscal tears are the most common associated intra-articular injuries in Schatzker type II (split-depression) tibial plateau fractures, occurring in up to 50% of cases. The meniscus often becomes incarcerated in the fracture site.
Question 7611
Topic: 2. Trauma
A polytrauma patient with multiple long-bone fractures, pulmonary contusions, and a severe head injury is initially managed with damage control orthopedics (DCO). According to the classic "two-hit" model of systemic inflammation, definitive fracture fixation should ideally be performed during which window to minimize the risk of ARDS and multiple organ failure?
Correct Answer & Explanation
. Within the first 24 hours
Explanation
The optimal "window of opportunity" for definitive surgery in polytrauma patients managed with DCO is typically between days 5 and 10. Surgery between days 2 and 4 coincides with the peak systemic inflammatory response syndrome (SIRS) and increases the risk of ARDS as a "second hit."
Question 7612
Topic: 2. Trauma
A 25-year-old male is brought to the emergency department after a high-speed motor vehicle collision. He has a severe traumatic brain injury, multiple rib fractures, and a comminuted midshaft femur fracture. Which of the following systemic markers best indicates that the patient has been adequately resuscitated and is a suitable candidate for early total care?
Correct Answer & Explanation
. Serum lactate < 2.0 mmol/L
Explanation
Serum lactate and base deficit are the most reliable indicators of systemic tissue perfusion and adequate resuscitation in polytrauma. Normalization of lactate (< 2.0 mmol/L) suggests the patient is clear of the systemic inflammatory danger zone and can tolerate definitive fixation.
Question 7613
Topic: 2. Trauma
A 55-year-old woman undergoes volar locked plating for a comminuted intra-articular distal radius fracture. At 6-month follow-up, she is unable to actively flex the interphalangeal joint of her thumb. What is the most likely cause of this complication?
Correct Answer & Explanation
. Iatrogenic injury to the anterior interosseous nerve
Explanation
Placement of a volar plate distal to the watershed line risks impingement and subsequent attrition rupture of the flexor pollicis longus (FPL) tendon. The watershed line marks the distal margin of the pronator quadratus, beyond which the tendons lie directly on the bone.
Question 7614
Topic: Lower Extremity Trauma
A 40-year-old man sustains a bicondylar tibial plateau fracture (Schatzker VI) with a displaced posteromedial coronal split fragment. Standard anterolateral plating alone is planned. What is the most likely consequence of failing to specifically address the posteromedial fragment?
Correct Answer & Explanation
. Varus collapse of the knee
Explanation
The posteromedial fragment involves the medial articular surface and supports the medial femoral condyle. Failure to anatomically buttress this fragment typically leads to varus collapse and posterior subluxation of the tibia.
Question 7615
Topic: 2. Trauma
A hypotensive 30-year-old polytrauma patient presents with an anteroposterior compression (APC) type III pelvic ring injury. To effectively reduce the pelvic volume and control hemorrhage, a pelvic binder should be centered over which of the following anatomic landmarks?
Correct Answer & Explanation
. Iliac crests
Explanation
Pelvic binders must be centered directly over the greater trochanters to effectively reduce the pelvic ring volume and stabilize the symphysis pubis. Placement over the iliac crests is less effective and may paradoxically open the pelvis in certain fracture patterns.
Question 7616
Topic: 2. Trauma
A 35-year-old man undergoes staged management of a high-energy Schatzker VI tibial plateau fracture. He is initially placed in a knee-spanning external fixator. Within 12 hours, he develops severe, unrelenting leg pain exacerbated by passive stretch of the hallux. What is the next most appropriate step in management?
Correct Answer & Explanation
. Loosen the external fixator pins
Explanation
Severe pain out of proportion to the injury and exacerbated by passive stretch is the hallmark of acute compartment syndrome. Immediate four-compartment fasciotomies are required to prevent irreversible ischemic necrosis.
Question 7617
Topic: 2. Trauma
According to the principles of Damage Control Orthopedics (DCO), which of the following clinical scenarios represents a borderline patient where temporary external fixation of a femoral shaft fracture is favored over early intramedullary nailing?
Correct Answer & Explanation
. Isolated closed femur fracture with a normal chest radiograph
Explanation
Bilateral pulmonary contusions and elevated initial lactate indicate a high-risk borderline polytrauma patient. Early total care (e.g., IM nailing) in this setting risks a fatal second hit such as ARDS, making DCO the safer strategy.
Question 7618
Topic: 2. Trauma
A 45-year-old man sustains a Schatzker II (split-depression) fracture of the lateral tibial plateau. During operative fixation, a peripheral tear of the lateral meniscus is identified. What is the most appropriate management of the meniscus?
Correct Answer & Explanation
. Total lateral meniscectomy
Explanation
The lateral meniscus is torn in a significant percentage of Schatzker II fractures, most often peripherally. The meniscus must be elevated to visualize and reduce the joint surface, followed by secure repair to restore hoop stresses and protect the articular cartilage.
Question 7619
Topic: 2. Trauma
A 78-year-old polytrauma patient with bilateral lower extremity fractures sustains a highly comminuted, intra-articular fracture of the distal radius extending into the metadiaphysis. The patient requires the use of the upper extremities for weight-bearing transfers. What is the most appropriate fixation strategy for the wrist?
Correct Answer & Explanation
. Volar locking plate
Explanation
A dorsal spanning plate provides excellent load-sharing stability in highly comminuted fractures or in patients requiring early weight-bearing through the upper extremities. It bridges the radiocarpal joint, allowing early transfer mobility while protecting the articular reduction.
Question 7620
Topic: 2. Trauma
A 45-year-old male sustains a high-energy Schatzker VI bicondylar tibial plateau fracture. Thirty-six hours after undergoing open reduction and internal fixation with dual plating, he develops severe, unrelenting leg pain that is exacerbated by passive plantar flexion of the toes. Examination reveals decreased sensation in the first dorsal web space. Which of the following compartments is most likely affected, and which nerve is at greatest risk?
Correct Answer & Explanation
. Anterior compartment; deep peroneal nerve
Explanation
High-energy tibial plateau fractures carry a significant risk for compartment syndrome, most commonly affecting the anterior compartment. The deep peroneal nerve courses through the anterior compartment, and ischemia leads to weakness in toe extension and paresthesias in the first dorsal web space.
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