[Bilateral spontaneous rupture of the patellar tendon in systemic lupus erythematosus. A case report and review of the literature].

A rupture of the patella ligament occurs after acute trauma or if there are factors that could have predisposed to the rupture like former injuries or operations of the knee or systemic diseases. If symptoms like loss of active extension, no patella tendon reflex, and a proximally displaced patella in radiograph appear in cases of those diseases, it should be thought of the rare rupture of the patella ligament. It will be treated operatively by suture of the tendon supporting by a wire, applying a cast for six to eight weeks and following physical therapy.