The quadratus femoris is a deep lateral rotator of the hip joint that is overlooked because of our excessive focus on its neighbor, the piriformis.
Five Muscles of Sacroiliac Stabilization – Part 2 – Coccygeus and Others
The coccygeus and levator ani are technically muscles of the pelvic floor, however, they are also muscles whose contraction forces cross the sacroiliac joint and therefore often tighten when a sacroiliac joint condition exists. The coccygeus attaches from the sacrum and coccyx to the ischial spine of the pelvic bone.
