Quadriceps tendon rupture.

Rupture of the quadriceps tendon is an uncommon yet serious injury requiring prompt diagnosis and early surgical management. It is more common in older (>40 years) individuals and sometimes is associated with underlying medical conditions. In particular, bilateral spontaneous rupture may be associated with gout, diabetes, or use of steroids. Clinical findings typically include the triad of acute pain, impaired knee extension, and a suprapatellar gap. Imaging studies are useful in confirming the diagnosis. Although incomplete tears may be managed nonsurgically, complete ruptures are best treated with early surgical repair.