Medial tibiofemoral arthrosis is a disabling disease, particularly for active middle-aged patients who have failed conservative and biological precursor treatments. The UniCAP Bipolar Knee Resurfacing System (Arthrosurface, Incorporated, Franklin, Massachusetts) was introduced in 2008 to add a new layer to reconstructive joint surgery, allowing for a delay in traditional joint replacement procedures. It utilizes intraoperative, 3-dimensional joint surface mapping to fit and implant defect-sized components that are matched to the individual joint surface.