“…However, the lesion was small and had completely disappeared 7 months after the onset. Although the condition remains idiopathic, minor trauma, synovitis, dysfunction of nerves and blood vessels, and transient ischemia 1,4,8 are indicated as possible causes of the disease. Mechanical weakness of bone trabeculae was suggested histologically for TOH, 4 and the anterosuperior portion of the femoral head, where the linear pattern was seen, has been reported to be subject to the highest contact pressure during level walking.…”