During osteochondral autograft transfer, also referred to as mosaicplasty and OATS® (Osteochondral Autograft Transfer System), a series of cutting instruments are used to harvest one or more cylindrical grafts of articular cartilage and underlying bone from a healthy, less weight-bearing area of the knee joint. These grafts are then implanted into the site of the lesion, to treat a focal lesion in the articular cartilage and possibly also in the underlying bone. A limited number of surgical institutions perform this procedure as it is technically challenging.