Poor experience with a hinged endoprosthesis (WEKO) for the metacarpophalangeal joints
Authors: Radmer, Sebastian; Andresen, Reimer; Sparmann, Martin
Source: Acta Orthopaedica Scandinavica, Volume 74, Number 5, October 2003 , pp. 586-590(5)
Publisher: Informa Healthcare
Abstract:We prospectively assessed the outcome of implanting a hinged prosthesis in destroyed metacarpophalangeal (MCP) joints (Larsen stage III-V). We implanted 28 cementless, axis-coupled total endoprostheses with hinging (WEKO prosthesis, Implant-Service GmbH, Hamburg, Germany) in 8 women (mean age 62 (47-80) years) suffering from rheumatoid arthritis. The mean follow-up period was 15 (12-18) months, and the evaluation was based on objective criteria, including joint motion, ulnar deviation of the long fingers, grip strength, radiographic migration and torsion of the prostheses, as well as the patients´ subjective satisfaction. 12 months postoperatively, the mean arc of flexion was 30 (22-35)°, and the mean extension lag was 43 (40-48)°. Although no ulnar deviation was seen in 2 fingers, it was <10° in 3, between 10° and 20° in 7 of the fingers, and more than 20° in 16. None of the patients could clench their fist firmly. We found prosthesis migration in 20 and torsion in 19 fingers. 2 years postoperatively, we had to remove all of the prostheses due to functional failure.
Document Type: Research Article
Publication date: 2003-10-01