Instability after total knee arthroplasty with the Miller-Gallante II total knee - 5- to 7-year follow-up

A consecutive series of 64 posterior cruciate-retaining hybrid total knee a rthroplasties in 50 patients were reviewed with an average 57-month follow- up. Seven patients died or were lost to follow-up. One patient was revised for infection in the early postoperative period, and there were no cases of aseptic loosening. Four revisions were performed for recurrent effusions a nd progressive instability at a mean of 55 months postoperatively. There we re statistically significant correlations between manual stability resting (anteroposterior, mediolateral, and pivot shift) and Hospital for Special S urgery and I(nee Society scores. At intermediate follow-up, the Miller-Gall ante II total knee arthroplasty is functioning well except in a subgroup of patients with progressive instability resulting from a combination of pati ent and implant factors.