Quadriceps Tendon Injuries
What is the quadriceps tendon?
The quadriceps tendon connects the quadriceps muscles (at the front of the thigh) to the top of the kneecap (patella). It plays a key role in straightening the knee and is essential for standing, walking, running, and jumping.
A quadriceps tendon tear occurs when this tendon is partially or completely torn, often near its attachment to the kneecap. A complete tear results in loss of knee extension and significant weakness in the leg.
Symptoms include sudden pain above the kneecap, swelling, bruising, and difficulty straightening the knee. A complete tear may cause a visible gap just above the kneecap, and patients often struggle to walk or bear weight.
These injuries typically happen during a sudden load on the knee — such as landing from a jump, stumbling, or trying to stop a fall. Risk increases with age, chronic tendonitis, prior knee surgery, or conditions like diabetes or kidney disease.
Diagnosis is based on physical exam findings, such as inability to extend the knee or a palpable gap above the kneecap. X-rays may show a low-riding patella. MRI confirms the tear and helps determine whether it’s partial or complete.
Partial tears may be treated with bracing, rest, and physical therapy. Complete tears typically require surgical repair to restore knee extension and prevent long-term weakness or gait issues.
Surgical repair involves reattaching the torn tendon to the kneecap using sutures and anchors. In some cases, graft material may be added for reinforcement, especially in chronic or complex tears.
Recovery generally takes up to 6 months. Patients use a knee brace and crutches early on, with gradual progression to physical therapy. Initial rehab focuses on motion and preventing stiffness, followed by strengthening and return to activity.
At a Glance
Sachin Allahabadi, MD
- Board-Certified & Fellowship-Trained Sports Medicine Surgeon
- Expertise in Minimally Invasive Knee & Shoulder Surgeries
- Assistant Professor of Clinical Orthopaedic Surgery, Houston Methodist Hospital & Weill Cornell Medical College
- Learn more
