Musculoskeletal Trauma Flashcards

A 40-year-old motorcyclist involved in a high-speed collision presents with a clinically unstable pelvis and a blood pressure of 85/50 mmHg. According to ATLS principles, what is the most appropriate and immediate intervention to help control the pelvic hemorrhage?

Answer: Application of a pelvic binder or circumferential sheet.

The most appropriate immediate step is to apply a pelvic binder or circumferential sheet. This action serves to close the pelvic volume, which provides temporary stabilization of the fracture, reduces further bleeding by promoting tamponade, and can improve hemodynamic stability. [3, 5, 7] While other listed interventions like surgery, angiography, and transfusion are crucial, the pelvic binder is the fastest, non-invasive first step in hemorrhage control for this specific injury. [3, 7]

Which of the following is considered the earliest and most reliable clinical finding in a conscious patient with acute compartment syndrome of the lower leg?

Answer: Pain that is out of proportion to the apparent injury

Pain out of proportion to the injury, especially pain with passive stretching of the muscles in the affected compartment, is the earliest and most sensitive sign of acute compartment syndrome. [4, 8, 15] The other signs, such as pallor, pulselessness, and paralysis, are late findings and indicate that significant, and possibly irreversible, ischemic damage has already occurred. [4, 15]

A 22-year-old rugby player sustains a knee dislocation on the field. The deformity is immediately reduced by the team physician, and upon arrival to the emergency department, the patient has warm feet and palpable distal pulses. Which potential injury remains a primary concern that requires urgent further evaluation?

Answer: Popliteal artery injury

Knee dislocations have a high incidence of associated popliteal artery injury, which can occur even if distal pulses are present due to an intimal tear that can lead to thrombosis. [11, 28, 30] The presence of pulses does not rule out a significant vascular injury. [27] Therefore, urgent vascular assessment, often starting with an Ankle-Brachial Index (ABI) and potentially followed by advanced imaging like a CT angiogram, is mandatory. [27] While ligamentous and nerve injuries are also common, a missed vascular injury is the most significant threat to the limb. [11, 24]

In the initial management of a patient with an open tibial fracture, which of the following is the most appropriate sequence of actions in the emergency department according to ATLS guidelines?

Answer: Remove gross contaminants, cover with a sterile saline-moistened dressing, realign the limb, splint, and administer IV antibiotics.

The correct initial management for an open fracture involves controlling any life-threatening hemorrhage, removing visible gross contaminants, covering the wound with a sterile dressing to prevent further contamination, gently realigning the limb to a more anatomic position to restore perfusion and relieve pressure on soft tissues, immobilizing it with a splint, and administering prompt intravenous antibiotics and tetanus prophylaxis. [1, 6, 19] Aggressive scrubbing in the ED is not recommended, and tourniquets are only for life-threatening hemorrhage unresponsive to other means. [1]

A 70-year-old woman falls and presents with a shortened, externally rotated, and severely swollen right thigh. Her vital signs are HR 120 bpm, BP 90/60 mmHg. This presentation is highly suggestive of a femur fracture with associated hemorrhage. In addition to initiating fluid resuscitation, which intervention is most critical for controlling the ongoing blood loss?

Answer: Applying a traction splint.

Applying a traction splint is a critical intervention for a mid-shaft femur fracture. It helps to realign the bone fragments, which reduces the potential space within the thigh for hemorrhage and decreases muscle spasm. This stabilization can significantly reduce ongoing blood loss, which can be 1.0-1.5 liters or more. [21, 22, 25] While fluids and TXA are important components of resuscitation, the traction splint provides mechanical control of the bleeding source. [21, 25]

A patient is extricated after being trapped under a collapsed structure for several hours. They are diagnosed with crush syndrome and rhabdomyolysis. What is the primary goal of initial fluid management to prevent acute kidney injury?

Answer: Aggressive intravenous fluid resuscitation to induce a high-volume diuresis.

The cornerstone of managing rhabdomyolysis and preventing acute kidney injury from myoglobinuria is early and aggressive intravenous fluid resuscitation with isotonic crystalloids. [18, 20, 23] The goal is to establish a high urine output (e.g., 200-300 mL/hr) to flush the myoglobin casts through the renal tubules and prevent their precipitation and subsequent damage. [13, 16] Diuretics are generally contraindicated until volume status is restored, and fluid restriction would be harmful. [16]