Peripheral Nerve Blocks for Above-the-knee Amputations

All enrollees will have ultrasound-guided femoral and sciatic nerve blocks placed per current practice at research site. Single-injection obturator and lateral femoral cutaneous nerve blocks will also be performed.

Intravenous sedation using propofol or dexmedetomidine will be administered.

After administration of intravenous sedation, lateral femoral cutaneous and obturator nerve blocks (in addition to the femoral and sciatic catheters) will be performed under ultrasound guidance.

After administration of intravenous sedation, lateral femoral cutaneous and obturator nerve blocks (in addition to the femoral and sciatic catheters) will be performed under ultrasound guidance.