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Osteochondritis dissecans is an aseptic necrosis of subchondral bone and the overlying cartilage. This lesion is seen most frequently in young men. The most common site affected is the knee joint, with involvement of the medial femoral condyle and occasionally of the patella. The elbow is a frequent site, with the capitellum the most common area involved.
Trauma is considered the inciting cause for the development of this condition. Some consider that there may be a developmental or congenital background.
A condition noted in older persons resembles this lesion in some respects. It also has been described by some writers as osteochondritis dissecans. I have noted it on the medial femoral condyle in adults who required surgical treatment for a fracture of the internal meniscus. I have noted its occurrence also among persons who showed an acutely painful knee after injury to a knee joint revealing mild hypertrophic arthritis. I
DAWSON CW. OSTEOCHONDRITIS DISSECANSA DISCUSSION OF TWO SIMILAR LESIONS. Arch Surg. 1943;46(5):635-638. doi:10.1001/archsurg.1943.01220110051011