Spontaneous Osteonecrosis of the Knee and Medial Meniscal Tears

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Abstract
Several factors may play a role in the etiology of spontaneous osteonecrosis of the medial femoral condyle. Corticosteroids are known to induce osteonecrosis, and 45% of the patients in this study received steroids parenterally or by intra-articular injection. Another factor, heretofore given little attention, is the association of medial meniscal tears and spontaneous osteonecrosis. Of 27 kees examined by arthrography, 21 (78%) demonstrated meniscal tears. Stress concentration over the edge of the meniscal fragment may result in ischemic necrosis of the femoral condyle. Early detection of a medial meniscal tear by arthrography in older patients and prompt treatment may be important in avoiding the late changes of spontaneous osteonecrosis.

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