Andrew Howard, James Hunter, Theddy Slongo
The etiology of this chondral/osteochondral shearing lesion is traumatic hip dislocation.
The ostechondal flake is usually a single piece (31-E/8.1).
Rarely is it multifragmentary (31-E/8.2).
Note: It is important to distinguish between chronic osteochondrosis (osteochondritis) dissecans (OCD) and a traumatic lesion. OCD has a long history of hip pain and/or limited hip motion.
In the x-ray image, a flake fracture is seen clearly and the head of the femur is standing off, due to the interposition.