Sorry to hear about the pain. I had 2 bone marrow & bone core biopsies before my stem cell transplant 7 years ago. They were both very painful but full recovery in a week or two. I also had two more after thinking it may have comeback and one there was no pain at all. One they had to redo because they couldn’t get thru. I think something went wrong like bone breaking or damaging a nerve. You may have to back off the intense triathlon training for a few months to let the hip bone really heal and see a orthopedic surgeon or even a sports Dr. I am dealing with chronic pain from a stem cell transplant. I healed up okay from 2 crushed vertebrae’s because of the MM but I just accepted I can’t lift as much as I use too but I am getting better at running the water ski course and have slowdown snow skiing.