Fractures and dislocations of the knee: The Daily PANCE Blueprint

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Fractures and dislocations of the knee: The Daily PANCE Blueprint

A 35-year-old man presents to the emergency department after a high-speed motor vehicle collision. He has a grossly deformed left knee with severe swelling and is unable to bear weight. Vascular assessment shows diminished pulses distal to the injury. Which of the following is a major concern with knee (tibiofemoral) dislocations?

A. Achilles tendon rupture
B. Popliteal artery injury
C. Lateral collateral ligament sprain
D. Patellar fracture
E. Tibial tuberosity avulsion

Answer and topic summary

The answer is B. Popliteal artery injury

Popliteal artery injury is a major concern with knee (tibiofemoral) dislocations due to the artery’s proximity to the knee joint. Knee dislocations can cause stretching or tearing of the popliteal artery, leading to compromised blood flow to the lower leg and foot, which can result in ischemia and potentially limb-threatening complications if not promptly recognized and treated. The presence of diminished pulses distal to the injury in this patient raises immediate concern for vascular injury, necessitating urgent vascular imaging and consultation.

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Covered under ⇒ PANCE Blueprint Musculoskeletal ⇒ Lower extremity disorders (PEARLS) ⇒ Fractures and dislocations of the knee