Hx: what else, hip pain
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Well I guess this didn’t allow to enlarge the image as much as I’d hoped, but the key finding is the super femoral head - ie a crescenteric subchondral lucency = the so-called “crescent sign” of avascular necrosis (specifically stage 3).
Crescent sign: http://radiology.rsna.org/content/217/1/213.full
Ficat stages (I quickly made this chart using the reference below)