A 26-year-old professional rugby player is transported to the trauma bay after sustaining a direct, high-velocity blow to his right knee during a match. He complains of excruciating leg pain. On physical examination, the right knee is visibly deformed. His right foot is pale and cool to the touch. He is hemodynamically stable and has no other systemic injuries. Arrange the following steps in the acute management of this patient's limb in the most appropriate chronological sequence.
- 1Perform a baseline evaluation of the distal pulses
- 2Perform emergent closed reduction of the knee joint
- 3Reassess vascular status and measure the Ankle-Brachial Index (ABI)
- 4Obtain a CT angiogram of the lower extremity if the ABI is less than 0.9
- 5Consult vascular surgery for operative exploration if arterial injury is confirmed
Answer
The correct sequence is to perform a baseline evaluation of distal pulses, perform emergent closed reduction of the knee, measure the Ankle-Brachial Index (ABI), obtain a CT angiogram if the ABI is abnormal, and consult vascular surgery if arterial injury is confirmed.
The standard sequence for managing a knee dislocation with vascular compromise (pale, cool foot) begins with a baseline neurovascular exam. This is followed immediately by emergent closed reduction to restore blood flow; imaging should not delay this step. Post-reduction, the limb must be screened for occult popliteal artery injury using the Ankle-Brachial Index (ABI). If the ABI is abnormal, a CT angiogram is obtained, which guides definitive operative management by vascular surgery.
Step-by-Step Solution
Key Concept
Due to the high risk of popliteal artery injury in knee dislocations, management requires immediate baseline neurovascular assessment, emergent closed reduction, and post-reduction vascular screening with an ABI, followed by CT angiography if the ABI is abnormal.