Defined as a continuity solution on the muscular-osseous-tendinous chain of the knee, ensuring the extension of the leg on the thigh, the traumatic rupture of the knee's extensor apparatus is often reported in literature. They are dominated by patellar fractures. The patellar or quadricipital tendon damage is rare and even exceptional in a bilateral topography. The aim of this work was to highlight the clinical case of bilateral rupture of the patellar tendon of late diagnosis, occurring in an adult with a particular field. It was an adult, who presented a bilateral rupture of the knee extensor apparatus following a minimal traumatism. Anamnesis found a chronic kidney disease correctly follow-up. The diagnosis was delayed so was the surgical management (Krackow's technique and protection by a metallic frame). At 8 months post surgery the functional result is acceptable. The bilateral rupture of the patellar tendon stays a rare pathologic entity, which always seems associated at a particular field. The diagnosis delay (and so did the care) is an important bad prognosis factor. Treatment of this old form (unknown) is exclusively surgical.