Osteochondritis dissecans - knee

Case contributed by Dr Ammar Haouimi


Pain and locking of the left knee.

Patient Data

Age: 40 years
Gender: Male

The MRI sequences demonstrate a well-defined osteochondral defect of the lateral aspect of the medial femoral condyle with underlying edema of the bone marrow of low signal on T1WI, and high signal on PD fat sat.

The detached osteochondral fragment is displaced, seen in the anterior aspect of the intercondylar notch, anterior to the distal ACL of low signal on T1WI, and intermediate signal on PD fat sat.

Degenerated posterior horn of the medial meniscus, grade 2c (MRI grading system for meniscal signal intensity). Mild joint effusion is noted

ACL, PCL, and collateral ligaments are intact.

Case Discussion

MRI features of an unstable osteochondritis dissecans of the knee, considered as stage IV according to osteochondral injury staging.

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Case information

rID: 68275
Published: 22nd May 2019
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included
Institution: Aurès Medical Imaging Center - Batna Algeria

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