Meyers and McKeever classification of ACL avulsion fractures is the most frequently employed system to describe ACL avulsion fractures.
Classification
Under the Meyers and McKeever system (with modifications by Zaricznyj) injuries are classified into four main types:
type 1: minimally/nondisplaced fragment
type 2: anterior elevation of the fragment
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type 3: complete separation of the fragment
type 3a: involves small portion of eminence
type 3b: involves the majority of the eminence
type 4: comminuted avulsion or rotation of the fracture fragment
History and etymology
The classification was initially proposed by Meyers and McKeever in 1959 and later modified by Zaricznyj in 1977 1.
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