ACL and medial meniscus tear

Case contributed by Seamus O'Flaherty


Acute trauma to knee with inability to extend knee.

Patient Data

Age: 40 years
Gender: Male

ACL tear with only a few fibers of the anteromedial bundle remaining, with no secondary signs of recent injury, likely longstanding.

Medial meniscus body and posterior horn horizontal tear with a small displaced fragment lying anterior to the posterior root attachment. Associated mild edema of the medial tibial plateau and medial margin. Fluid in pes anserine space is likely reactive. Large uncomplicated Baker's cyst.   

Case Discussion

This patient has an acute medial meniscus tear that is responsible for the presentation and locking. The ACL tear appears longstanding due to the absence of associated bone edema, hemarthrosis or synovitis. 

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