Quadriceps tendon rupture
Other names	Quadriceps tendon tear
An x-ray demonstrating quadriceps tendon rupture. Note the abnormal angle of the patella and soft-tissue swelling marked by the arrow.
Specialty	Orthopedic

A quadriceps tendon rupture is a tear of the tendon that runs from the quadriceps muscle to the top of the knee cap.^[1]

Signs and symptoms

Symptoms are pain and the inability to extend the knee against resistance. A gap can often be palpated at the tendon's normal location.

Diagnosis

The diagnosis is usually made clinically, but ultrasound or MRI can be used if there is any doubt.

• 
  Quadriceps tendon rupture in plain X-ray
• 
  Quadriceps tendon rupture in plain X-ray: Incomplete rupture with haematoma in tendon.
• 
  Quadriceps tendon rupture in plain X-ray
• 
  X-ray of a tear of the patellar tendon. On the left: The kneecap is pulled up. On the right: Significant dent in the soft tissue above the kneecap.
• 
  Operative image: 1. Kneecap 2. upper patella pole with drill holes 3. Stump of the quadriceps tendon

Treatment

The tendon can be surgically repaired. Afterwards a brace is given that prevents flexion of the knee. Athletes who have had this injury generally return to action in about 9 months to a year.^{[citation needed]}