Figure 2From: Identification of a novel COL2A1 mutation (c.1744G>A) in a Japanese family: a case report Plain radiographic findings of the femoral head. Anteroposterior (AP) and lateral radiographs (Sugioka) obtained at the time of the onset of pain show the crescent sign, collapse of femoral head, and no joint space narrowing in either femoral head. The lateral view (Sugioka) of left hip shows the presence of a free body (black arrow).Back to article page