MEDIAL UNICOMPARTMENTAL ARTHROPLASTY WITH THE OXFORD MENISCAL KNEE: EARLY OUTCOME

One hundred-one knees with medial compartmental osteoarthrosis were treated by unicompartmental arthroplasty with the Oxford Knee. The strict selection criteria were: (1) the presence of functioning anterior cruciate ligament, (2) correctable deformity and (3) full thickness of articular cartilage in the lateral compartment. The mean elapsed time from surgery was 28 months. One knee required revision for a loose tibial component; one had meniscal bearing dislplacement 1 month after the operation and was revised succesfully by replacing the meniscal implant with a thicker one. One implant was revised to a tricompartmental prosthesis.The femoral component has a spherical articular surface. The meniscal bearing is made of high-density polyethylene and is concave superiorly and flat inferiorly to fit exactly the metal femoral and tibial components. The meniscal bearing is not attached to either metal component but is held in place by its reciprocal shape and the tension in the ligaments. The bearing, which is...