ACL avulsion fracture is the fracture of the tibial attachment of ACL at the anterior intercondylar region.
Zaricznyj modification of Meyers and McKeevers classification is the most used system, which divides these fractures into 4 types, with type 3 further divided into 3a and 3b.
Type 1 : Minimally / Non-displaced fragment.
Type 2 : Anterior elevation of the fragment.
Type 3 : Complete separation of the fragment.
3a - Involves small portion of the eminence.
3b - Majority of eminence is involved.
Type 4 : Comminuted avulsion or rotation of the fragment.
T1 WI showing Type 4 (Comminuted) Avulsion fracture in a 21yr male.
Type 3b ACL Avulsion fracture in an 18y female patient.
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