The Insall-Burstein total knee replacement in osteoarthritis - A 10-year minimum follow-up

A total of 99 Insall-Burstein posterior stabilized (IBPS) knee replacements were implanted in 86 osteoarthritic patients. We reviewed 60 knees with a 10- to 15-year follow-up. Using the Knee Society score, 35 knees (58%) were excellent, 15 (25%) good, 4 (7%) fair, and 6 (10%) poor. Flexion at follow -up was 106 degrees on average. Moderate patellofemoral crepitation was pre sent in 5 knees (9%), and 1 knee required excision of a synovial nodule pro ximal to the patella. Radiographic analysis showed 5 osteolytic lesions (8% ) around well-fixed tibial and femoral components and minimal (1 mm) narrow ing of the medial pelyethylene thickness in 7 knees (12%). There were 6 (10 %) failures requiring reoperation because of aseptic loosening (4 knees), d eep infection (1 knee), and recurrent patellar dislocation (1 knee). Surviv orship analysis using revision as the endpoint showed a cumulative success rate of 92% at 10 years. In this study, the IBPS knee has shown good long-t erm results with low rates of aseptic loosening and no failures attributabl e to polyethylene wear.