I first appreciated the importance of balance between the rotator cuff muscles during my second trip to Mysore, India, in 2002. Many of my fellow ashtanga students were having shoulder pain from supraspinatus tendon impingement. I was a massage therapist in those days, and in all of them, I found a typical pattern of tight, sensitive and underactive subscapularis, infraspinatus and teres minor muscles. By stimulating these muscles, symptoms in many quickly disappeared. Of course, I had no idea about using headstands back then; I just worked those muscles with my hands.
There are other reasons why injuries to the shoulder, including the rotator cuff, can occur. These include poor
control of movment and shoulder blade stability (
scapula winging)
Lastly, do keep in mind that this was a small study that really requires further investigation. For example, there were only 10 subjects involved, there was no control group, and there were no follow up MRI's taken to assess how well the tissues had healed. In my opinion, though, in some people with rotator cuff tears, headstand practice is certainly worth exploring.