Good quick read on ACL special tests from Scott Gray PT. I have seen a ton of false negatives in the acute stages due to muscle guarding and the bodies protective mechanisms. Check out the link below:

from the post: According to Benjamin and Et al, they concluded the following is highly likely to discern an ACL Tear:

* Popping during MOI
* Positive Lateral Pivot Shift
* Positive Lachmans
* Positive Anterior Drawer

What Is the Best Test to Discern An ACL Tear?

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