Most adults will experience shoulder pain at some point during their lifetime, and it’s estimated that nearly one-third of adults are affected each year. Among the many possible diagnoses, shoulder impingement syndrome accounts for roughly half of all shoulder pain cases. However, current understanding indicates that shoulder impingement syndrome is not a single diagnosis, but rather a cluster of symptoms that can arise from multiple anatomical and biomechanical factors. The condition is typically classified as either internal or external, depending on where and how the impingement occurs.
The shoulder complex functions as an integrated system of four joints that together…
