I've had a nasty case of proximal hamstring tendonitis for 2 years now. I've done all the PT, six month off, etc. Finally did a steroid injection last January which worked wonders. I was well under control for my training for Boston in 3 weeks, and now it's made it so I can't run more than 4-5 miles. I'm back to another shot or likely DNS for Boston. Anyone successfully done multiple shots of these? My MD is nervous about it, my PT (who used to train for an MLB team) says it can be done multiple times.