We review our first 100 LCS rotating platform total knee arthroplasty (TKA) procedures. Done between July 1993 and December 1996, they are currently at four to seven year follow-up.

The sample includes 100 TKAs done in 88 patients as unilateral or bilateral procedures. At operation the mean age of patients, 51% of whom were female and 49% male, was 67 years (47 to 84). The right side was replaced in 54% of cases and the left in 46%. Preoperative diagnoses included degenerative and post-traumatic osteoarthritis in 95 knees and rheumatoid arthritis in five.

Two assessments are currently being carried out. They include the American Knee Society Clinical Rating Score, functional ability and radiographic evaluation of knee alignment and radiolucencies. Mean clinical and functional Knee Society ratings were 38 and 57 (sum 95 points) preoperatively and 88 and 84 (sum 172 points) postoperatively. Radiographs showed valgus alignment in 90 rays and varus alignment (1° to 7°) in 10. Limited areas of radiolucency were seen around three tibial components. Two cases have required revision, one for septic loosening and one to correct recurrent varus deformity.