is an avulsion fracture of the knee that involves the lateral aspect of the tibial plateau and is very frequently (~75% of cases) associated with disruption of the anterior cruciate ligament (ACL). On the frontal knee radiograph, it may be referred to as the lateral capsular sign.

ACL tear
most common associated injury
75-100% of cases 
medial or lateral meniscal tear
66-75% of cases 
posterior horn most common
avulsion of ACL from the tibial attachment: rare
avulsion of fibular attachment of the long head of biceps femoris
avulsion of the fibular collateral ligament

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