Repetitive loading in the blocking position can put the shoulder at risk for instability from dislocation. You should talk with the coach or trainer but the best thing may be to see an orthopedic surgeon. X-rays, scans, and special tests may be needed to accurately diagnose the problem.

A special rehab program designed for this problem should be tried before jumping into surgery. Most of the time there's a muscle imbalance that can be overcome with the right kind of strength training. The joint itself may have to regain its full joint sense of position called proprioception. The physical therapist will also address this problem during rehab.

Early detection and intervention are the keys to getting back on the field and staying there without further injury. Don't put this off when it may be a small problem and before surgery or other invasive treatment is needed.