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It should not be confused with a Stieda process fracture of the talus.
Avulsion of the medial collateral ligament of the medial femoral condyle origin as the result of direct valgus stress or via a pivot shift mechanism. Patients will present with valgus instability on examination.
The avulsion fracture typically involves the meniscofemoral fibers of the deep medial collateral ligament. It has a high association with ACL tears and posterolateral corner injuries.
Small curvilinear fragment close to the medial femoral condyle at the origin of the medial collateral ligament. In some cases, there may be widening of the medial tibiofemoral joint space.
History and etymology
It is named after the German surgeon Alfred Stieda (1869-1945).
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