Medium-term outcome with contemporary mobile-bearing implants : results from a retrospective multicentre study

Previous studies report good clinical outcomes with the initial mobile-bearing implant design in TKA. Nevertheless clinical data on the subject system are scant and information is lacking to fully appraise the safety and performance of the subject device. A population of 283 consecutive patients who received 307 primary Vanguard ROCC TKAs over a 5.5-year period was retrospectively assessed. At follow-up, Knee Society Scores, Forgotten Joint Scores and Knee injury and Osteoarthritis Outcome Scores were obtained, and patients underwent radiographic evaluation at 4.9 ± 1.0 years post-implantation. Survival analyses included the following endpoints : revision of the tibial or femoral component for any reason, and revision of any component for any reason. At a mean follow-up time of 5.0 (range, 3.0-8.2) years, 166 patients (183 TKAs) were available for clinical assessment. All postoperative clinical scores were deemed satisfactory. Survival with revision of the tibial and/or femoral component for any reason was 97.3% (95%, 94.5-98.7%) at 6 years. Radiolucent lines were observed in 32 (17.7%) out of 181 knees. The present study showed that the Vanguard ROCC system demonstrates favourable clinical outcome with satisfactory medium-term survival.