Knee pain and swelling MENISCI: There is no discrete medial or lateral meniscal tearARTICULAR CARTILAGE AND BONE: There is a focal depressed osteochondral defect of the medial femoral condyle just above the free edge of the anterior horn of the medial meniscus measuring approximately 1 cm in its greatest diameter. There is edema type signal in the underlying bone likely representing the sequela of focal avascular necrosis. There is an additional focus of subchondral avascular necrosis of the lateral femoral condyle posteriorly without overlying articular surface collapse.There appears to be delamination of the articular cartilage along the anterior aspect of the lateral femoral condyle with a small focus of degenerative signal abnormality in the underlying marrow.LIGAMENTS: No significant abnormality noted. EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1. Osteochondral lesion of the medial femoral condyle with underlying marrow edema likely representing the sequela of avascular necrosis. An additional focus of avascular necrosis is noted in the lateral femoral condyle but without overlying articular collapse.2. Delamination of the articular cartilage of the lateral femoral condyle anteriorly.3. Moderately sized joint effusion and synovitis.4. Edema along the head of the gastrocnemius which may be the result of a leaking or ruptured Baker's cyst.5. No evidence of ligamentous or meniscal tear.