Dorsal root entry zone lesions for post-amputation pain.

Chronic pain following an amputation may involve the stump, the phantom limb, or both. Operations such as rhizotomy, cordotomy, stump revision, and dorsal column stimulation have been unsuccessful in treating this condition. This study evaluates the effectiveness of dorsal root entry zone (DREZ) coagulation for this pain problem. The authors studied 22 patients with amputations due to trauma, gangrene, or cancer. All developed post-amputation pain, underwent a DREZ procedure, and were followed from 6 months to 4 years after surgery. Overall, only eight (36%) of these 22 patients had pain relief. However, good results were obtained in six (67%) of nine patients with phantom pain alone, and in five (83%) of six patients with traumatic amputations associated with root avulsion. Poor results were obtained in patients with both phantom and stump pain, or stump pain alone. The DREZ procedure has a limited, but definite, place in the treatment of post-amputation pain.