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Quadriceps Tendon Rupture – Causes, Symptoms & Treatment
A quadriceps tendon rupture is a complete or partial tear of the tendon connecting the quadriceps muscle to the kneecap. It is a serious knee injury requiring prompt medical attention.
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A quadriceps tendon rupture is a complete or partial tear of the tendon connecting the quadriceps muscle to the kneecap. It is a serious knee injury requiring prompt medical attention.
What is a Quadriceps Tendon Rupture?
A quadriceps tendon rupture is a complete or partial tear of the quadriceps tendon, the strong band of tissue that connects the four-headed thigh muscle (musculus quadriceps femoris) to the kneecap (patella). This tendon plays a critical role in straightening the knee. A rupture therefore significantly impairs the ability to extend the leg and is considered one of the more serious injuries of the knee region.
Causes
A quadriceps tendon rupture typically occurs when a sudden, forceful load is applied to an already contracted tendon. Common causes include:
- Falls from height with an abrupt bending of the knee
- Direct trauma to the knee
- Sudden changes in direction during sports activities
- Pre-existing tendon degeneration caused by conditions such as gout, chronic kidney disease, diabetes mellitus, long-term corticosteroid use, or rheumatic diseases
The injury most commonly affects men over the age of 40 and athletes who participate in jumping or running sports.
Symptoms
Typical signs and symptoms of a quadriceps tendon rupture include:
- Sudden, severe pain above the kneecap at the time of injury
- An audible popping or snapping sound
- Swelling and bruising around the knee and lower thigh
- A palpable gap or indentation just above the kneecap
- Inability to actively straighten the knee or lift the leg with a straight knee
- A feeling of instability when standing or walking
Diagnosis
Diagnosis is usually established through a combination of clinical examination and imaging studies:
- Physical examination: The physician assesses the ability to extend the knee and palpates for a defect above the patella.
- Ultrasound (sonography): A quick and cost-effective method for visualizing tendon tears.
- Magnetic resonance imaging (MRI): The gold standard for precisely assessing the extent of the tear and any associated injuries.
- X-ray: Used to rule out bone fractures and to evaluate the position of the kneecap.
Treatment
Conservative Treatment
In selected cases involving a partial tear, conservative management may be appropriate. This includes immobilization of the knee with an orthosis, the use of crutches for weight-bearing restriction, and targeted physiotherapy to restore muscle strength.
Surgical Treatment
A complete rupture typically requires surgical repair. The goal of surgery is to reattach the torn tendon to the kneecap, usually using specialized sutures and reinforcement techniques. Early intervention, ideally within a few days of injury, significantly improves outcomes.
Aftercare and Rehabilitation
Surgery is followed by a rehabilitation phase lasting several months, which includes:
- Gradual increase of weight-bearing and range of motion
- Physiotherapy exercises to strengthen the quadriceps muscle
- Gait training and coordination exercises
- Return to sport no earlier than 6 to 12 months after surgery
The prognosis is generally favorable when the injury is treated promptly. Most patients are able to fully return to daily activities and sports after successful rehabilitation.
References
- Browner, B.D. et al. – Skeletal Trauma: Basic Science, Management, and Reconstruction. 5th Edition. Elsevier Saunders, 2014.
- Hsu, H. & Siwiec, R.M. – Quadriceps Tendon Rupture. StatPearls Publishing, 2023. Available at: https://www.ncbi.nlm.nih.gov/books/NBK536926/
- Ilan, D.I. et al. – Quadriceps tendon rupture. Journal of the American Academy of Orthopaedic Surgeons, 2003; 11(3):192–200.
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