Presentation
Chronic pain of the right knee. History of motorcycle accident 2 years ago.
Patient Data
There is an osteochondral defect of the lateral femoral trochlea with subchondral cystic changes and no bone marrow edema. The detached osteochondral fragment is displaced above the patella, in the suprapatellar bursa. No ligament or meniscal injuries were seen. Subtle joint effusion.
Case Discussion
MRI appearance of an old osteochondral fracture of the lateral femoral trochlea.
The presence of subchondral cystic changes as well as the absence of bone marrow edema and significant joint effusion are suggestive of a non-acute injury.