Dislocation of the Polyethylene Bearing of the Medial Unicompartmental Knee Arthroplasty: A Case Report

Treatment methods of unicompartmental osteoarthritis of knee joint are arthroscopy, osteotomy, unicompartmental arthroplasty, and total arthroplasty. Among them the rate of unicompartmental arthroplasty is increased and many complications are reported recently. Polyethylene wear and component loosening, and infection are the common failure mechanism, but dislocation of meniscal polyethylene is rare, and not reported. So we report the case of the dislocation of polyethylene and study the cause and preventive method.