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ANSWER
The diagnosis is osteochondritis dessicans (OCD), in which
a chunk of bone and cartilage has broken partially or completely
loose from a joint surface. Based on this single view, the
fragment appears to be only minimally displaced. A better
examination for staging purposes is a magnetic resonance imaging
scan. This condition is most often diagnosed in adolescent
boys and is typically associated with trauma. The weight-bearing
aspect of the medial femoral condyle is the most common site
of OCD lesions at the knee.
For further reading, see: S. Canale, Campbell's Operative
Orthopaedics, 9th ed., St. Louis, Mosby, 1998, pp. 1266-1273.
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