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[Prosthetic replacement of the semilunar bone].

Twenty-two protheses of the lunate were implanted in the osteonecrosis stage III described by Decoulx. The authors chose palmar approach to release the median nerve in the carpal tunnel. A dorsal incision is sometimes necessary to fix taut the dorsal capsular ligament. The wrist is immobilised for six weeks. The dislocation (5 cases) is the complication the most to be feared and comes from: a weakness of the capsular ligament system, a badly fithing implant, insufficient immobolisation. This implant decreases the pain and improves the mobility of the wrist but the grasp remains poor (50% operated cases give excellent or good results). The indications of these implants demand serious discussion for manual workers (more than 30% of these operated cases had to change job).