Preoperative (Pre-amputation) Cryoanalgesia to Improve Post-amputation Phantom Limb Pain

Participants will receive cryoanalgesia with the The iovera° system. . The specific nerves targeted will be both the sciatic, targeted first (as distal as possible, but not more distal than the bifurcation), and femoral, targeted second (as distal as possible, but not more distal than the adductor canal). Cryoanalgesia will result from an 8-minute-long percutaneous cryoneuroablation procedure consisting of several freeze/defrost cycles. Per routine, all patients will have a nerve block with single shot ropivacaine.

Participants will receive Sham cryoanalgesia with the The iovera° system. The specific nerves targeted will be both the sciatic, targeted first (as distal as possible, but not more distal than the bifurcation), and femoral, targeted second (as distal as possible, but not more distal than the adductor canal). Per routine, all patients will have a nerve block with single shot ropivacaine.