99% of adults over 40 have shoulder "abnormalities" on an MRI, study finds

Up to a third of people worldwide have shoulder pain; it's one of the most common musculoskeletal complaints. But medical imaging might not reveal the problem—in fact, it could even cloud it.

In a study published in JAMA Internal Medicine this week, 99 percent of adults over 40 were found to have at least one abnormality in a rotator cuff on magnetic resonance imaging (MRI). The rotator cuff is the group of muscles and tendons in a shoulder joint that keeps the upper arm bone securely in...