Presentation
Twisting injury 1 week ago. Local pain on the medial side of the knee. Unable to extend the knee.
Patient Data
Subtle cortical avulsion fracture medial femoral condylar epiphysis (arrow) below the expected poistion of the medial collateral ligament origin with overlying soft tissue swelling
Subtle avulsion fracture caudal to the expected position of the superficial fibers of the medial collateral ligament origin. Fluid sits between the superficial MCL and the so-called menisco-femoral extension of the deep MCL fibers.The attachment of this menisco-femoral extension has been avulsed.
Case Discussion
The MCL has superficial and deep portions usually separated by a layer of fat. The deep portion on the femoral side is attached to the medial meniscus. In this case following twisting injury, the cortical attachment of this menisco-femoral extension has avulsed rather than the ligament rupture.
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