Bilateral spontaneous patellar tendon rupture in the absence of concomitant systemic disease or steroid use.

A case of bilateral patellar tendon rupture in an otherwise healthy 41-year-old man is presented. This is the 15th case reported in the literature. The mechanism of injury is attributed to a flexion moment coupled with a contraction of the quadriceps muscle in nearly all reported cases. Surgical repair produces excellent results.