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Quadriceps Tendon Rupture – Causes, Symptoms & Treatment

A quadriceps tendon rupture is a tear of the tendon connecting the quadriceps muscle to the kneecap. It causes severe pain and loss of knee extension.

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Things worth knowing about "Quadriceps tendon rupture"

A quadriceps tendon rupture is a tear of the tendon connecting the quadriceps muscle to the kneecap. It causes severe pain and loss of knee extension.

What is a Quadriceps Tendon Rupture?

A quadriceps tendon rupture is a complete or partial tear of the quadriceps tendon – the strong tendon that connects the four-headed thigh muscle (musculus quadriceps femoris) to the kneecap (patella). This injury is one of the more serious tendon injuries of the musculoskeletal system and significantly or completely impairs the ability to actively extend the knee.

Causes

A quadriceps tendon rupture is most commonly caused by a sudden, excessive force applied to the tendon, typically during:

Falls from a squatting position or while descending stairs
Direct trauma to the knee
Sudden eccentric muscle contraction (e.g., when decelerating during sports)

Certain underlying medical conditions significantly increase the risk of rupture:

Chronic kidney disease and dialysis dependency
Diabetes mellitus
Gout (hyperuricemia)
Long-term use of corticosteroids or fluoroquinolone antibiotics
Rheumatoid arthritis and other inflammatory joint diseases
Previous knee surgery or local corticosteroid injections

Symptoms

Typical signs of a quadriceps tendon rupture include:

Sudden, severe pain above the kneecap
An audible or palpable popping or snapping sensation at the moment of injury
Swelling and bruising around the knee or thigh
A palpable gap or depression (tendon defect) just above the kneecap
Inability to actively extend the knee or lift the leg with a straight knee
Instability and difficulty bearing weight when standing or walking

Diagnosis

Diagnosis is based on clinical examination and imaging studies:

Physical examination: Assessment of active knee extension ability and palpation of the tendon defect
X-ray: To exclude associated bony injuries; in complete ruptures, the kneecap may be displaced downward (patella baja)
Ultrasound: A quick and cost-effective method to visualize the tendon and assess the extent of the tear
Magnetic Resonance Imaging (MRI): The gold standard for precisely evaluating the extent of the rupture and any associated injuries

Treatment

Conservative Treatment

Partial tears with preserved active knee extension may be managed conservatively, including:

Immobilization of the knee in full extension using a brace or plaster cast for 4–6 weeks
Physiotherapy to restore strength and range of motion
Pain management with anti-inflammatory medications (NSAIDs)

Surgical Treatment

Complete ruptures generally require surgical repair of the tendon. The sooner surgery is performed, the better the functional outcomes. The procedure involves:

Suturing or reinserting the torn tendon to the kneecap, often using suture anchors
In chronic or neglected ruptures: tendon grafting or augmentation with additional tissue

Rehabilitation

Surgery is followed by a several-month rehabilitation program:

Gradual weight-bearing progression under physiotherapy supervision
Strengthening of the quadriceps muscle
Return to sport after approximately 6–12 months, depending on healing progress

Prognosis

With prompt and appropriate treatment, the prognosis for a quadriceps tendon rupture is generally good. Most patients regain full or near-full knee function following completed rehabilitation. Delayed treatment, however, can lead to permanent functional limitations.

References

Howells NR, Brunton LR, Robinson J et al. – Acute quadriceps tendon rupture: a pragmatic approach to diagnostic imaging. European Journal of Emergency Medicine, 2013; 20(1):28–33.
Mirzabeigi E, Jordan C, Gronley JK et al. – Isolated vastus lateralis weakness: an EMG study. Orthopedics, 1999; 22(11):1015–1019.
Sells RL, Cossette GC, Theriault RD – Quadriceps tendon tears: diagnosis and management. American Family Physician, 2022; 105(4):380–386.

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