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In 233 knees with anterior cruciate ligament insufficiency the characteristic diagnostic signs and symptoms were: a specific mechanism of injury; an audible "pop" at the time of injury; a positive anterior drawer sign' "giving away"; functional disability; periarticular degenerative changes. Unresolved anterior cruciate ligament insufficiency follows a predictable natural history typified by a course of progressive knee dysfunction and deterioration. The progress of deterioration can be significantly modified or arrested by repair or reconstruction of the injured ligament.
Fetto et al. (Sat,) studied this question.