Transient lateral patellar dislocation complicated by chondral fracture

Case contributed by Ammar Haouimi
Diagnosis certain


Basketball injury.

Patient Data

Age: 35 years
Gender: Male

There is a bone contusion of the medial aspect of the patella as well as the lateral femoral condyle with a chondral defect of the medial patellar facet. The detached cartilaginous fragments are displaced, well-visualized on the sagittal sequences behind the Hoffa's fat pad. Moderate joint effusion is noted. The medial patellar retinaculum is moderately thickened with no abnormal intrinsic signal or disruption seen.

Normal chondral thickness of the trochlear facets as well as the femoral condyles. No meniscal tear is seen. ACL and PCL are intact.

Case Discussion

In this case, the pattern of the bone contusion of the medial aspect of the patella, and the lateral femoral condyle is consistent with transient lateral dislocation of the patella complicated by chondral fracture.

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