Achilles paratenonitis


The Achilles tendon does not possess a synovial sheath. It is surrounded by a loose areolar tissue, called the paratenon. The paratenon is typically found in straight tendons with a high proportion of elastic fibers. It permits free movement of the tendon against the surrounding tissues. Together, the epitenon and the paratenon compose the peritendon. Hence, the term peritendonitis could be applied as well.