Periosteal sleeve avulsion fracture of the patella (and Osgood Schlatters disease)

Discussion:

Focal cortical elevation at the lower pole of the patella with development of a vertical cleft (periosteal sleeve avulsion fracture). Note minimal surrounding edema suggesting injury is not "acute".  There is also edema in the tibial apophysis consistant with co-existent Osgood Schlatter disease.

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