So how do ACL injuries occur?
The typical mechanics of how an ACL ruptures is landing, or changing direction with uncontrolled inward knee movement. The inward movement of the knee causes load to be applied to the ACL. When the load exceeds about 50lbs the ACL will rupture. The typical time frame of when the ACL ruptures with landing or changing direction is within 30 – 100ms of initial ground contact.
Understand how ACL ruptures occur gives us a framework to assess injury risk, build qualities to prevent their occurrence, and to properly develop return to sport protocols.