[Bilateral rupture of the quadriceps tendon, a rare disease pattern (author's transl)]. 
The article reports on the rare bilateral rupture of the quadriceps tendon.  This tendon will rupture more readily after it has undergone a degenerative change.  A distinctly noticeable pit, which may be masked by a haematoma, is clinically prominent, as well as an absolute active inhibition of stretching and an abnormal lateral mobility of the patella.  Immediate repair is the method of choice.  The article describes the method of operation.