Ishial tuberosity pain that looks like a hamstring but is not responding? Think QF.
We have always have found the quadratus femoris is one of, if not the, 1st hip muscle to become dysfunctional in hip pain patients. Perhaps it is due to it being the southern most stabilizer of the deep 6. Long known as an adductor, but also external rotator, we find it is employed eccentrically when the foot the planted and people rotate to the same side as weight bearing, or people take a “sudden stumble” while running. It often mimics an insertional hamstring strain with regards to location. We were happy to see it is getting some of the attention it deserves : )
