Abstract
Introduction We report the clinical and radiographic outcome of a consecutive series of 138 hydroxyapatite coated total knee replacements with a mean follow up of 11 years (10–13 years)
Method and Results These patients were entered into a prospective study. There were 74 females and 32 males. Indications for surgery were osteoarthritis in 131 knees, rheumatoid arthritis in 5 knees and pigmented villo-nodular synovitis in 2 knees. The mean age of the patient was 72.5 years at the time of surgery. All living patients (76 knees) were examined and X rayed. A current Hospital for Special Surgery knee score (mean 83 points) was obtained for comparison with the preoperative profile (mean 55 points).The knee status of deceased patients was known within the year of death. No patient was lost to follow up. Radiological evaluation, assessed according to the method described by the Knee Society, revealed no loosening in surviving patients, and there are no impending revisions. Seven prostheses have been revised, giving a cumulative survival rate of 93 percent at 13 years.
Discussion. We believe this to be the longest follow up report available for an hydroxyapatite coated knee replacement, and the first using the Insall Burstein knee. Results can thus be compared with the identical prosthesis using cemented fixation. Further modifications would be likely to improve reliability.
Theses abstracts were prepared by Professor Roger Lemaire. Correspondence should be addressed to EFORT Central Office, Freihofstrasse 22, CH-8700 Küsnacht, Switzerland.
