[Partial rupture of the quadriceps tendon in a 6-year-old boy].

In children, avulsion fractures of the patella are observed more frequently than ruptures of the quadriceps tendon. In cases of suspected lesions of the quadriceps tendon, conventional x-ray imaging and ultrasound comparison of both patellae is recommended. Arthroscopy is helpful for diagnosing concomitant intra-articular knee lesions and permits evacuation of the hemarthrosis.