Can you get shoulder tendonitis by throwing side arm?

Yes: When throwing sidearm, a different set of muscle contractions control the motion of the shoulder, however, the same rotator cuff muscles control the stabilization of the shoulder joint. These tendons go through tremendous forces during the throw, and can still develop inflammation or tendinitis.

Yes: Throwing places extreme forces on both the shoulder and elbow. It is more common to have tendinitis or injury in the elbow from side-arm throwing, but tendinitis in the shoulder is common as well.

Yes, Treatments are: Prolotherapy typically by itself will cause ligaments to tighten up, usually due to scarring or fibrosis of the ligaments. However now prolotherapy is used to introduce new blood supply to the area and then many times following it with the prp and/or stem cells in the area can repair the tissue/ligaments by the hopes that the stem cells regenerate the same normal tissue type. Regenexx.Com