I had a dislocated shoulder from making an arm tackle on a HUGE running back and after that it ended my baseball career and every time i ever made a tackle with that arm or hit someone with my shoulder on a stunt it killed....just hope it isn't the end and make sure you take the precautions like i didn't...i was too anxious and decided to pass on the shoulder and i lost numerous baseball scholarships due to it. Good luck with your back.