Although, ulnar wrist pain is experienced in many diseases, such as trauma, tenosynovitis, Guyon's canal syndrome, hypothner hammer syndrome, TFCC injury, DRUJ disorder, and ulnocarpal abutment syndrome, osteoarthritis of the pisotriquetral joint is rare. We report two cases of the osteoarthritis of the pisotriquetral joint. The main symptom of these cases was ulnar wrist pain. Ulno-carpal abutment syndrome was associated in one case, and Guyon's canal syndrome in the other. As conservative treatment was not effective, surgical treatment was performed. Excision of the pisiform provided complete relief from the ulnar wrist pain.
