29/01/2025
Student question :
Why do we see so many over pronounced tensor fascia latae muscles in horses even when they are not moving ?
Simple incorrect motion and loading of the hindlimb. If you see an over developed or over pronounced tensor fascia latae muscles chances are your horse's femur is unstable during the loading phase of the gate cycle.
Ilium position affects muscle function. Ilium position in most horses is unbalanced between left and right creating a shear through the pelvic.
Example - When one of the iliums rotates medial and cranial ( in and up), two muscles become challenged because of poor position to counteract each other, for stable femoral loading.
Their effectiveness in keeping the pelvis or acetabulum positioned correctly over the hock is lost, because the psoas has to work harder as an external rotator to keep the femur lined up with the foot.
This leads to the psoas and tensor fascia latae now becoming the primary femoral and hip stabilizers through ilium rotation instead of the gluteals. We can clearly see this when we have these very prominent tensor fascia latae muscles.
So if your tensor fascia latae muscles are over pronounced , chances are your horse is struggling with hind limb stability.