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 7541
Topic: 2. Trauma
A 24-year-old man presents with a closed femoral shaft fracture, multiple rib fractures, pulmonary contusions, and an initial Glasgow Coma Scale (GCS) of 6 following a high-speed motor vehicle collision. He is hypotensive in the emergency department and requires vasopressor support. What is the most appropriate management of his femur fracture?
Correct Answer & Explanation
. Early reamed intramedullary nailing
Explanation
In a hemodynamically unstable polytrauma patient (borderline or in extremis), damage control orthopedics (DCO) with rapid external fixation is indicated. Early reamed intramedullary nailing in this setting significantly increases the risk of ARDS and secondary brain injury.
Question 7542
Topic: 2. Trauma
A 28-year-old man sustains a closed spiral fracture of the distal third of the humerus (Holstein-Lewis fracture). Physical examination reveals an inability to actively extend the wrist or fingers. What is the most appropriate initial management?
Correct Answer & Explanation
. Immediate surgical exploration and primary nerve repair
Explanation
The presence of a primary radial nerve palsy in a closed humeral shaft fracture is not an absolute indication for surgery. Initial management consists of coaptation splinting and observation, as the majority of these palsies spontaneously resolve.
Question 7543
Topic: 2. Trauma
A 32-year-old man sustains a posterior hip dislocation. Following emergent closed reduction, a CT scan reveals a concentric joint space, no intra-articular loose bodies, and a posterior wall fracture involving 15% of the acetabular articular surface. What is the most appropriate definitive management?
Correct Answer & Explanation
. Open reduction and internal fixation of the posterior wall
Explanation
Posterior wall fractures involving less than 20% of the articular surface are generally stable. Non-operative management with protected weight-bearing is indicated when the hip is concentrically reduced and clinically stable on dynamic stress testing.
Question 7544
Topic: 2. Trauma
A 28-year-old man sustains a closed midshaft humeral fracture. He presents with a wrist drop and inability to extend his fingers. Radiographs show a transverse midshaft fracture. What is the most appropriate initial management of the nerve injury?
Correct Answer & Explanation
. Immediate nerve exploration and repair
Explanation
Radial nerve palsy associated with closed humeral shaft fractures typically represents a neuropraxia. The standard initial management is functional bracing or splinting and observation for 3 to 4 months before considering nerve exploration.
Question 7545
Topic: 2. Trauma
A 45-year-old polytrauma patient presents with a closed left femoral shaft fracture, multiple rib fractures, and bilateral pulmonary contusions. His serum lactate is 4.5 mmol/L and pH is 7.15. Which of the following is the most appropriate management of his femur fracture?
Correct Answer & Explanation
. Immediate reamed intramedullary nailing
Explanation
This patient is in a borderline/unstable physiologic state as evidenced by elevated lactate and acidosis. Damage control orthopedics (DCO) with temporary external fixation is indicated to minimize the inflammatory "second hit" associated with definitive intramedullary nailing.
Question 7546
Topic: 2. Trauma
A 32-year-old man undergoes reamed intramedullary nailing for a closed tibial shaft fracture. Postoperatively, he complains of severe leg pain out of proportion to the injury, exacerbated by passive toe stretch. His blood pressure is 130/80 mmHg. What intracompartmental pressure finding definitively confirms acute compartment syndrome?
Correct Answer & Explanation
. Absolute pressure greater than 20 mmHg
Explanation
The diagnosis of acute compartment syndrome is confirmed when the differential (delta) pressure between the diastolic blood pressure and the measured intracompartmental pressure falls below 30 mmHg. This indicates critical ischemia requiring immediate fasciotomy.
Question 7547
Topic: 2. Trauma
A 70-year-old woman on long-term alendronate therapy presents with vague thigh pain. Radiographs demonstrate an incomplete transverse fracture of the lateral cortex of the subtrochanteric femur with localized periosteal thickening.
What is the recommended prophylactic surgical treatment?
Correct Answer & Explanation
. Dynamic hip screw fixation
Explanation
Atypical femur fractures related to prolonged bisphosphonate use feature characteristic lateral cortical thickening and a transverse fracture pattern. Prophylactic full-length cephalomedullary nailing is recommended to prevent completion of the fracture.
Question 7548
Topic: 2. Trauma
A 25-year-old cyclist falls directly onto his shoulder. Radiographs reveal a midshaft clavicle fracture with 2.5 cm of shortening and complete displacement. Which of the following is an expected outcome if this is treated nonoperatively rather than surgically?
Correct Answer & Explanation
. Higher risk of neurovascular injury
Explanation
Completely displaced midshaft clavicle fractures with greater than 2 cm of shortening treated nonoperatively have a significantly higher rate of symptomatic malunion and nonunion. This can lead to objectively decreased shoulder strength and rapid fatigability.
Question 7549
Topic: 2. Trauma
A 34-year-old man sustains an isolated, closed, diaphyseal fracture of both the radius and ulna.
What is the preferred definitive management to maximize the restoration of forearm pronation and supination?
Correct Answer & Explanation
. Closed reduction and long arm casting
Explanation
In adults, diaphyseal both-bone forearm fractures are treated as articular injuries because perfect alignment is required for normal pronation and supination. The standard of care is anatomic open reduction and internal fixation (ORIF) with compression plating.
Question 7550
Topic: 2. Trauma
A 40-year-old man presents after a high-energy motor vehicle crash with a distal femur fracture. CT scan reveals a coronal plane fracture of the lateral femoral condyle. What is the optimal fixation strategy for this specific fracture fragment?
Correct Answer & Explanation
. Lateral to medial lag screws
Explanation
A coronal shear fracture of the femoral condyle is known as a Hoffa fracture. It requires anatomic reduction and absolute stability, best achieved with lag screws directed anterior-to-posterior (AP) or posterior-to-anterior (PA).
Question 7551
Topic: 2. Trauma
In a subtrochanteric femur fracture, the proximal fragment is typically deformed by specific muscle forces. Which of the following describes the typical position of the proximal fragment and the primary muscle responsible for its flexion?
In subtrochanteric fractures, the short proximal fragment is pulled into a characteristic position: flexion by the iliopsoas, abduction by the gluteus medius and minimus, and external rotation by the short external rotators.
Question 7552
Topic: 2. Trauma
A 28-year-old polytrauma patient sustains a highly comminuted, closed femoral shaft fracture in a motor vehicle collision. On arrival, he is tachycardic, has an SpO2 of 88% on room air, and exhibits petechiae across his axillae and chest. Which of the following is the most appropriate initial management for his femur fracture?
Correct Answer & Explanation
. Early total care with a reamed intramedullary nail
Explanation
This patient exhibits clinical signs of fat embolism syndrome and pulmonary compromise. In a physiologically unstable or borderline polytrauma patient, damage control orthopedics using temporary external fixation is favored to avoid the additional physiological 'hit' of reamed intramedullary nailing.
Question 7553
Topic: 2. Trauma
A 34-year-old man sustains a transverse midshaft humerus fracture during an arm wrestling match. In the emergency department, he demonstrates an inability to actively extend his wrist or digits. What is the most appropriate initial management?
Correct Answer & Explanation
. Immediate surgical exploration of the radial nerve
Explanation
A primary radial nerve palsy associated with a closed humeral shaft fracture typically represents a neuropraxia or axonotmesis. Observation with coaptation splinting or a functional brace is the standard of care, as spontaneous nerve recovery occurs in the vast majority of cases.
Question 7554
Topic: 2. Trauma
The deforming muscular forces acting on a subtrochanteric femur fracture characteristically result in what position of the proximal fragment?
Correct Answer & Explanation
. Flexed, adducted, and internally rotated
Explanation
In subtrochanteric femur fractures, the proximal fragment is acted upon by specific muscular deforming forces. It is flexed by the iliopsoas, abducted by the gluteus medius and minimus, and externally rotated by the short external rotators.
Question 7555
Topic: 2. Trauma
A 25-year-old man sustains a posterior hip dislocation following a dashboard injury. A closed reduction is performed within 4 hours. Post-reduction CT imaging shows a concentric joint reduction, no intra-articular fragments, and a non-displaced posterior wall fracture involving 10% of the articular surface. What is the most appropriate next step in management?
Correct Answer & Explanation
. Immediate open reduction and internal fixation of the posterior wall
Explanation
Small (<20%), non-displaced posterior wall fractures associated with a stable, concentrically reduced hip joint can be managed nonoperatively. Protected weight-bearing and close radiographic follow-up is the standard of care.
Question 7556
Topic: 2. Trauma
A 22-year-old male sustains a high-energy closed tibial diaphysis fracture. Four hours later, his leg is tense, and he complains of pain out of proportion to the injury. Passive stretch of his hallux elicits excruciating pain. His diastolic blood pressure is 65 mmHg, and his anterior compartment pressure measures 45 mmHg. What is the most appropriate management?
Correct Answer & Explanation
. Immediate four-compartment fasciotomy
Explanation
Acute compartment syndrome is a surgical emergency. A delta pressure (Diastolic BP minus Compartment Pressure) of less than 30 mmHg (in this case, 65 - 45 = 20 mmHg) is a definitive indication for immediate four-compartment fasciotomy.
Question 7557
Topic: 2. Trauma
A 66-year-old woman presents with atraumatic thigh pain. She has been taking oral alendronate for 9 years. Radiographs reveal a transverse fracture of the femoral shaft with lateral cortical thickening and a medial cortical spike. What is the most appropriate management of this condition?
Correct Answer & Explanation
. Discontinuation of alendronate and non-weight-bearing for 6 weeks
Explanation
This is an atypical femur fracture associated with long-term bisphosphonate use, characterized by severely suppressed bone turnover. Treatment requires intramedullary nailing of the affected side and critical evaluation of the contralateral femur, which is highly at risk for a synchronous lesion.
Question 7558
Topic: 2. Trauma
A 24-year-old man sustains a closed spiral fracture of the distal third of the humerus (Holstein-Lewis fracture). Initial examination in the emergency department documents normal wrist and finger extension. Following closed reduction and application of a coaptation splint, the patient immediately develops an inability to extend his wrist and digits. What is the most appropriate next step in management?
Correct Answer & Explanation
. Observation and electromyography (EMG) in 6 weeks
Explanation
A radial nerve palsy that develops after a closed reduction attempt indicates potential iatrogenic entrapment of the nerve within the fracture site. Immediate surgical exploration and fracture stabilization are required.
Question 7559
Topic: 2. Trauma
A 25-year-old man sustains a subtrochanteric femur fracture. To achieve an anatomic reduction, the surgeon must overcome the deforming forces acting on the proximal fragment. The proximal fragment is typically pulled into which of the following positions, and by which corresponding muscles?
Correct Answer & Explanation
. Extension (gluteus maximus), adduction (adductor longus), and internal rotation (tensor fascia latae)
Explanation
In subtrochanteric fractures, the proximal fragment is classically deformed into flexion by the iliopsoas, abduction by the gluteus medius and minimus, and external rotation by the short external rotators.
Question 7560
Topic: 2. Trauma
A 32-year-old man undergoes reamed intramedullary nailing for a closed tibial shaft fracture. Twelve hours postoperatively, he complains of severe leg pain requiring rapidly escalating doses of narcotics. Which of the following is the most objective and definitive threshold indicating the need for emergent fasciotomy?
Correct Answer & Explanation
. An absolute compartment pressure greater than 20 mm Hg
Explanation
A delta pressure (diastolic blood pressure minus compartment pressure) of less than 30 mm Hg is an absolute indication for fasciotomy in suspected acute compartment syndrome. Clinical signs like pain with passive stretch are sensitive early indicators but are subjective, while loss of pulses is a very late and unreliable finding.
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