Took the words out of my mouth, C ditty. I have this problem from time to time, but mine is from my hips being out of allignment (my son was 10 pounds when born, and I carried him VERY low-hairline fracture on my pelvis). Either way, it still places stress on the sacrospinatus muscle, and other deep tissue muscles around the hips/glutes/lower back. The stretch C ditty described, with both straight and bent legs, keeps me in business.