It’s time for another Austin-area sports medicine 101 class!
Where the joint lacks bony stability, the human body has a dynamic stabilizer in the rotator cuff. It is a group of four muscles that works to keep the humeral head centered and on-axis in the shoulder joint. When these muscles are weak, aberrant humeral head motion occurs and the joint is left open to injury. Early rehab exercises for rotator cuff strength might include: shoulder external rotation, internal rotation with an elastic band. Perform each for 2-3 sets of 20 reps each. The external rotators will naturally be weaker and less resistance is required for strengthening.
As with the other exercises, these would be modified to increase demand on the muscles by requiring a change in position, speed or load to improve the ability of the rotator cuff to stabilize the humeral head in more demanding activities.