I am a reasonably fit 66 year old female &weigh 60kg I have a problem with pain in my left lower back radiating down the back inner thigh through the calf muscle, I cannot sit down for more than a few minutes without a very painfull leg and it feels like something is trapped but have had mri scan that showed nothing, I have had this for a year now and am now starting to have very sore &stiff groins. I have electric impulses in my legs when lying down and can not lie on my left side without pain and it feels more trapped. Can still walk around fine but now its getting progressively worse even though I try to walk every day or do stretching exercises.I have always had very tight tendons in the backs of my legs. The pain is coming through to my left groin as I am sitting here and I feel like I am sitting on raw bones, I do not have much muscle on buttocks but soft cushions do not help