Revision of the unstable total knee replacement; outcome predictors

Instability is a well-recognized cause of poor results after total knee replacement. Lack of adequate soft tissue balancing, loss of integrity of ligamentous structures, and/or component malpositioning are thought to be the main causes of instability after TKA. Revision arthroplasty for confirmed cases of symptomatic instability is often required. We evaluated the results of revision of an unstable total knee arthroplasty. In particular, this study sought to identify predictive factors for success of revision arthroplasty.