Grade I rotator cuff injuries tend to be the result of tendinitis or another strain of the muscle without tearing it (3). They usually occur near the insertion, where the muscle attaches to a bone (3). Tendinitis causes inflammation of the tissue of the rotator cuff, weakening it and making it less resilient to everyday use (7). These types of injuries are common in older people, because they tend to have reduced blood flow to their tendons, making them less flexible and more prone to strain as a result (5). Because of the low blood supply, Grade I injuries usually take a long time to heal, and while the tissue is damaged, the muscle is more susceptible to a more serious secondary injury if not given adequate rest.
Grade I injuries can also
Grade I injuries can also