We report the results of Oxford unicompartmental knee arthroplasty after short term follow up. Twenty nine knees from 26 patients who had undergone Oxford unicompartmental knee arthroplasty from March 2002 to February 2006 were reviewed. There were 1 male(1 knee) and 25 females(28 knees) and average age was 65.9 years. The preoperative diagnosis was 22 cases of medial osteoarthritis and 7 cases of osteonecrosis of medial femoral condyle.

The postoperative knee society pain and function score, Lysholm score and HSS(Hospital for Special Surgery) score were improved compared with preoperative scores. The AP tibiofemoral angle was improved from varus 2.8° preoperatively to valgus 6.6°. Three cases of medial tibial condyle fracture were occurred and 1 case of overhang of tibial component was observed. Three cases were revised due to component loosening.

Even though high incidence of complication and loosening were observed, the clinical results of Oxford unicompartmental knee arthroplasty were improved in short term follow up. We thought that thorough preparations should be done prior to surgery and there was room for the improvement of femoral component design for the stability against rotational torque such as two pegs on the femoral component.