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Osteochondritis dissecans is a rare bit fairly well defined clinical and pathological entity characterized by the separation of a subchondral fragment of bone from the convex articular surface of a joint. It occurs most frequently in the knee, elbow, shoulder, ankle and hip. In the knee, the commonest site is the lateral aspect of the medial femoral condyle in an area close to the intercondylar fossa. The condition has also been reported in patella but rarely so in the lateral condyle of the femur. One of the cases reported by Hall and Hume (1970) had lateral condyle involvement but even that was on the inner aspect and followed renal transplantation. It is indeed rare to find osteochondritis dissecans affecting the postero-lateral aspect of the lateral femoral condyle. Not a single case has been found in the available World literature. Present case was, therefore, considered worth reporting.