I recently injured my left ankle and right elbow from a fall. I am on crutches. Yesterday when I was using my crutches I got a sudden sharp pain in my left shoulder down to my elbow. But it only hurts when I move in a certain position ex if I'm in a sitting position and lean of to reach for something or anytime of pressure on the shoulder. Could this be a pintched nerve or pulled muscle. No numbness or tingling just a quick sharp pain and as soon as I move from that position pain is gone and maybe left with a little ache.