Diagnostic Utility of a Novel Point-of-Care Test of Calprotectin for Revision Total Knee Arthroplasty

The purpose of this study is to investigate whether there are quantifiable differences in the level of calprotectin in the synovial fluid that allow separation of different modes of joint implant failure (e.g. infected, aseptic loosening). A subset of primary TKA patients (with history of OA) will be included as a baseline.