It provides power for many arm actions, including flexion as when throwing a ball side-armed , internal rotation arm-wrestling , and adduction pulling the arm in towards the body. For massage you will try to identify a tender spot in the corresponding muscle, then exclusively concentrate on that area and massage it with 10 — 15 slow and precise strokes. Careful history and physical examination with attention to injury mechanism are important to limit differential.
The best is, to keep the massage sessions really short, or to use your index finger only. Fortunately, most patients are able to compensate for its loss within 9 to 12 months.