[Pisotriquetral osteoarthritis].

Isolated osteoarthritis of the pisotriquetral joint is rare and can be as disabling as osteoarthritis of any other joint. The authors report on two cases, one in both hands. With typical anamnesis, exact clinical investigation, proper positioning during radiological examination and intraarticular application of anaesthetics, the diagnosis can be easily confirmed. If conservative therapy is unsuccessful, relief of pain can be obtained by excision of the pisiform bone. The biomechanical importance of the pisiform bone in its relation to the flexor carpi ulnaris is discussed.