Thanks MrsD, I checked the link you provided and also googled for more info and diagrams of the nerves involved. I think I may have mis led when I stated buttocks as those diagrams for Piriformis syndrome are in the buttocks back area when my pain is more on the side (hip area ) and I do not have any pain in the back of my leg at all. My pain is mostly outer thigh, outer knee area that sometimes radiates down the outer shin area, and sometime around the front of the thigh to the groin area. I have no back pain at all .