Dr Altcheck also had this to say:
http://www.hss.edu/newsroom_new-techniques-rotator-cuff-injuries.asp
Between three million and four million patients annually see a physician for problems with the rotator cuff, the complex network of muscles and tendons that hold the shoulder in place and enable the arm to rotate. Injuries can be caused by accidents, repetitive use, a bone spur that saws away at muscle, or the aging process.
While many pulls and strains can be managed with physical therapy, anti-inflammatory medications or steroid injections, a torn rotator cuff can't heal on its own without surgery. As a result, chances of a more serious tear increases, leaving surgery as the only option. By some estimates the number of tears requiring surgery could more than double over the next several years to 500,000, as active baby boomers push the limits of their aging bodies