Snapping Plantaris Tendon as Cause of Pain in an Amateur Runner: A Case Report.

A rare case of painful snapping around the Achilles tendon without reported injury in a healthy 30-year-old male amateur runner is reported. The plantaris tendon was firmly attached to the Achilles tendon by adhesions, and its movement was restricted and impaired. All adhesions were removed and the plantaris tendon was liberated during surgery, with an excellent outcome. This case showed that previously described removal of the snapping tendon is not necessary because liberation of the plantaris tendon restored function of both the plantaris and the Achilles tendons.