Discoid lateral meniscus and loose body

Case contributed by Andrew Lawson


Knee pain, not specified.

Patient Data

Age: 65 years
Gender: Male

Left knee


There is a discoid lateral meniscus without evidence of a lateral meniscal tear. Loss of articular cartilage of the weight-bearing portions of the femoral condyle and medial tibial plateau with a small region of focal full thickness loss in the central medial femoral condyle.

 A 22 x 6 x 5 mm intra-articular body lies just posterior to the PCL. No evidence of a joint effusion. The ACL, PCL, MCL and LCL are intact. The posterolateral corner structures are intact. The patellar and quadriceps tendons are normal.

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