Will stem cells heal my torn rotator cuff, or do I need surgery to fix?

Q. I am a 45-year-old competitive racquetball player who has had six months of right shoulder pain. The pain is worst on overhead motions while playing. The discomfort also wakes me at night. An MRI scan showed a partial tear of my rotator cuff tendon.

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Contributor: Harlan Selesnick, M.D.