Considering the large number of reported cases of osteochondritis dissecans of the knee joint and other large joints of the body, it is surprising how few observations have been made of the same condition in the hip joint. The English and American literature as far as I could find out does not include a single observation. I have been much interested in this peculiar lesion of the hip joint since my first observation of it in 1926 and have since collected 5 more cases of what is either osteochondritis dissecans or a condition closely related to it. There is no doubt that the disease is rare, and an exact diagnosis—as simple as it appears in outstanding cases—cannot always be made from a roentgenogram, representing, as it does, only one period of the lesion's development. Practically identical roentgen pictures may be presented by essentially different processes, so that the roentgenologic diagnosis
FREUND E. OSTEOCHONDRITIS DISSECANS OF THE HEAD OF THE FEMURPARTIAL IDIOPATHIC ASEPTIC NECROSIS OF THE FEMORAL HEAD. Arch Surg. 1939;39(3):323–352. doi:10.1001/archsurg.1939.01200150002001
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