I'm a female hs XC runner and two weeks ago I began feeling pain in my hip and tightness in my left buttock. I went to an ortho and he told me it was a small gluteal muscle strain. However, the pain is definitely not muscular. My sit bone is tender when I press on it and along with that I have severe inner groin tightness and pain. I don't think it's a sfx bc there is no pain walking or jumping or running. I get a dull ache in my left buttock when sitting for awhile and my groin hurts to stretch. My buttock does tighten up a bit after my run and my groin when squeezing legs together, stretching, etc, but goes away with rest. The ortho won't write a referral for an MRI, and my mom can't afford one. What could this be?