A recent study in the American Journal of Sports Medicine has identified another potential contributor to ACL injuries in female athletes.
It seems that females tend to have an imbalance between the heads of their gastrocnemius with the lateral gastroc being much more active than the medial gastroc during straight ahead running and cutting. This may actually increase the strain on the ACL in some situations (it certainly does so when tested statically).
The theory is that the increased lateral gastroc activity is an attempt to increase knee joint stability since female knees tend to be more lax.
Females also tend to cut and land from jumping with smaller hip and knee angles which are known risk factors in ACL injury.
Take these issues into consideration when training your female athletes.
Bill