Late complications with the Pritchard Mark II elbow prosthesis.

Twenty-three consecutive patients with rheumatoid arthritis who had 26 Pritchord Mark II elbow prostheses were followed prospectively with a mean follow-up of 75 months (range 52 to 101 months). Two patients with three elbow prostheses have died, leaving 21 patients with 23 elbow prostheses for review. At the latest follow-up all the nonrevised elbows had achieved good or excellent results concerning pain relief and elbow motion. According to the data analyzed by a survivorship function-a Kaplan-Meier curve-the early results were promising with 92% of the prostheses surviving the first 5 years; however, only 43% of the prostheses have survived 8 years. Seven prostheses have been revised; the reasons for revision include one infection, one humeral fracture, one loosening of the humeral component, and four disconnections of the hinge. The number with disconnection of the hinge is increasing. Of 16 prostheses still not revised, the x-ray film reveals migration of the pin axle in six. Radiographic signs of component loosening or migration of the axle are not reflected in pain, function, or total score of the elbow.