adverse event occurs in tendon disorder AE a connective tissue disorder AE that occurs at the location of tendon YH According to the Vaccine Adverse Event Reporting System (VAERS), 'tendon disorder'; is an adverse event that was mentioned in 137 VAERS reports (0.1%) during1991-2001 (Reference: PMID: 12825543). A tendon (or sinew) is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension. Tendon disorder is a medical condition that results in a tendon not functioning normally. connective tissue disorder AE tendon