I had a bone marrow biopsy last week very close to the middle of my hip area. It was a horrible experience. I was given something to relax me which didn't really work. It was the most painful thing I've ever done including child birth! I have a high pain tolerance but that was awful. I'm now having issues sitting or standing for long periods of time. It feels like something happened to my tail bone. Oh one other thing, he was pounding the biopsy "tool" into my bone. It seemed very barbaric.