Abstract
We performed Unicompartmental Knee Arthroplasty (UKA) for two patients who were diagnosed as having idiopathic osteonecrosis of the knee according to its characteristic clinical course, roentgenographic findings and magnetic resonance imaging. Patients were both women and their ages were 75 and 72 years.The lesion was located in the medial femoral condyle, producing instability of their medial joints. Femoral condyle cartilage was detached and dystrophied widely as shown by arthroscopic surgery which was performed simultaneously. After the surgery, their knee pain was relieved and their function improved markedly.Usually we perform high tibial osteotomy (HTO) for cases who have pain and disability in their daily life in spite of conservative treatment and achieve success using this treatment. In the past if the osteonecrotic lesion is wide and the knee is unstable, total knee arthroplasty (TKA) has been performed, but now we encourage using UKA for such patients.
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