Well, I hope you are right (causes groin pain, which I don't have and was one of the things the GP asked me about) as that will give me hope that I might not need a hip replacement, but only physiotherapy for a trapped nerve - I expect the x-ray on Monday will reveal this. I "just" (that's a laugh, I don't think) have this very annoying ache all the way down the outside of my right leg that seems to emanate from the hip/back.
Thanks for that re the pillow, I will certainly give it a try tonight and let you know.