Everyone has a slightly different bony anatomy. Whether it’s a longer femur, bent shin (tibial torsion), or a rotated hip socket (acetabular retroversion), your anatomy, in addition to your functional goals, should ultimately drive squat depth. So how deep or low should you squat? From an injury prevention and biomechanical perspective, there is only one thing that should matter – posterior pelvic tilt.
Medial knee collapse, also known as knee valgus, is when the knee collapses or falls inward during any sort of weight bearing activity, like a squat, during gait, or during sport specific movements like cutting. Knee valgus is characterized by hip adduction and hip internal rotation in a flexed hip position. This position of the knee is most commonly associated with a non-contact mechanism of injury of the Anterior Cruciate Ligament (ACL), and occurs in the running or jumping athlete during the deceleration phase of a cutting movement.