Dysfunction of the pisotriquetral joint: treatment by excision of the pisiform.

Sixty-seven painful pisotriquetral joints were treated by excision of the pisiform over a 30-year period. Forty-two patients had a previous history of trauma. Ulnar neuropathy was noted in 22 patients, particularly in those with associated wrist-hand fractures and subluxations or dislocations of the pisiform. The abductor and flexor digiti minimi and the palmar carpal ligament with their common fibrous origin were the most common compressing structures on the ulnar nerve. Chondromalacia was found in 29 and osteoarthritis in 20 pisotriquetral joints. Excision of the pisiform provided complete relief of localized hypothenar pain in 65 wrists with no loss of wrist motion or strength. Neurolysis produced full sensory recovery in all 22 patients and full motor recovery in five of six. No late problems associated with the flexor carpi ulnaris tendon were found after excision of the pisiform.