Yes, the Iliopsoas refers to the three muscles - the psoas major, psoas minor and the iliacus. These three muscles are crucial for standing, walking and running. When I have the Botox injections done, they are done under fluoroscope guidance - basically x-raying the spot to make sure the needle goes into the proper muscle. Ice does help a bit afterward but because the injections are so deep into the muscle, it causes the rest of my muscles to flare up in protest. I can actually feel the sensation of pain going into my thigh during the injections - it's kinda creepy actually
Stretches are good and I have some that I do, but because of the issues with my hip (the head of the femur doesn't fit into the hip socket properly, so I have bone grinding on bone, plus tears in the tissue), some of the stretches are impossible to do.
I do get relief with the Botox, but not as long lasting as we hope - it's usually just a few weeks at most, instead of months. I'm hoping this time will last longer...but we'll see.