A study by Gomes (2008) in the Journal of Arthroscopy found a significant correlation between decreased hip internal rotation and non-contact ACL tears.
Decreased hip internal rotation causes increased frontal plane compensation (femoral adduction). An increase of frontal plane adduction by 10 degrees can increase the load on the ACL by 100% (McLean).
Decreased hip IR can be caused by decreased gluteus medius strength. If the gluteus medius is not strong enough than synergists can become overactive (piriformis, adductors, and TFL). Overactivity of the piriformis and adductor magnus cause a decrease in hip internal rotation.
Perform a movement assessment to determine if the knee adducts during an overhead and single leg squat. Perform a goniometric assessment to measure hip extension, hip adduction, and hip internal rotation. Perform a positional kinematic assessment to look at the position of the SI Joint
- Foam Roll: Adductors, ITB, and Piriformis
- Stretch: Adductors, Hip Flexors, Piriformis
- Activate: Gluteus Medius, Maximus, and Core
- Integrate: Functional Performance Training in the sagittal, frontal, and transverse plane using unstable environments to provoke reactive neuromuscular control