May be a long shot but I had pain in buttocks and tendonitis in my right leg that would cause right leg to go num when driving (accelerator foot). My orthopedic suggested Platelet Rich Plasma instead of surgery. Using your own blood to heal yourself really appealed to me. Nothing can be used to fight inflammation because the platelets release chemicals that call other healing cells to the area. This causes an inflammatory response. I also used in on top of both my feet to relieve arthritis with great success. No down time. Walked out after both times I had it. Minimal discomfort. Done with ultrasound for guidance to affected area. The numbing and PRP shots can be a little uncomfortable, but no more, or as much, as cortisone shots.
Definitely worth looking into. Not sure all orthopedic doctors perform it. Not always covered by insurance, but not horribly expensive.