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What is the “True” Function of the Gluteus Medius?
The major function of the gluteus medius is its “reverse” closed-chain action of pelvic depression at the hip joint to stabilize the pelvis when walking.
Psoas Major Function: Spinal Joint Actions – Frontal and Transverse Planes
The frontal plane spinal action of the psoas major is fairly clear; it crosses the spinal joints laterally, so it lateral flexes the spine to that side.