Editorial Commentary: The Hip Bone's Connected to the Knee Bone, but Correlation Does Not Equal Causation-The Association of Hip Motion, Femoroacetabular Impingement, and Anterior Cruciate Ligament Injury.
Editorial Article
Overview
abstract
Patients with anterior cruciate ligament (ACL) injury had significantly less hip rotational motion (internal rotation [IR] and sum of IR and external rotation) than control subjects without ACL tears. For each hip IR increase of 10°, the odds of sustaining an ACL rupture decreased by a factor of 0.419. Although this investigation does not prove (causation) that loss of hip rotational motion causes an ACL tear, it does continue to complement the growing and evolving literature base showing an upstream or downstream association (correlation) of decreased hip motion on adjacent structures.
