Tendon Rupture
A partial or complete tear of the cord that connects muscle to bone
Quick Facts
- Type: Soft-tissue (tendon) injury
- Common sites: Achilles, rotator cuff, biceps, quadriceps, kneecap
- Common causes: Sudden force, falls, overuse, weakened tendon
- Frequent sign: A pop, sudden weakness, or inability to move
Overview
Tendons are tough, fibrous cords that connect muscles to bones and transmit the force that moves our joints. A tendon rupture is a tear in this tissue, which may be partial, leaving some fibers intact, or complete, separating the tendon entirely. When a tendon ruptures, the muscle can no longer pull on the bone normally, so the affected joint loses strength or movement.
Common sites include the Achilles tendon at the back of the ankle, the rotator cuff in the shoulder, the biceps in the upper arm, the quadriceps above the kneecap, and the patellar tendon below it. Ruptures often happen suddenly during activity, sometimes in a tendon already weakened by age, repeated stress, or certain medications. Many complete ruptures need surgical repair to restore full function.
Symptoms
Symptoms depend on the tendon involved but typically come on suddenly with a complete rupture.
- A snapping or popping sensation at the moment of injury
- Sudden, sharp pain at the site, sometimes described as being kicked or struck
- Rapid swelling and bruising
- Marked weakness or inability to move the joint normally
- A gap or dent that can sometimes be felt where the tendon tore
- Difficulty bearing weight, lifting, or pushing off, depending on location
An Achilles rupture, for example, often makes it hard to push off the foot or stand on tiptoe, while a quadriceps or patellar tendon rupture can make it impossible to straighten the knee. Sudden loss of function after a pop warrants prompt evaluation.
Causes
Tendon ruptures usually result from a sudden, forceful load, especially when a tendon is already weakened.
- Sudden force or push-off: Jumping, sprinting, or pivoting that places a heavy strain on the tendon.
- Falls and direct trauma: Landing hard or a blow to a tightened muscle and tendon.
- Overuse: Long-standing tendinitis that gradually weakens the tendon.
- Lacerations: A deep cut, particularly to hand or finger tendons.
Aging tendons, certain health conditions, steroid use, and some antibiotics (such as fluoroquinolones) can weaken tendons and make rupture more likely.
Risk Factors
- Middle age and older, when tendons lose some elasticity
- Sports involving jumping, sprinting, and rapid direction changes
- Chronic tendinitis or prior tendon injury
- Corticosteroid injections near a tendon or long-term steroid use
- Certain antibiotics, such as fluoroquinolones
- Conditions affecting tendon health, including some chronic diseases
Diagnosis
A clinician examines the injured area, tests strength and movement, and feels for a gap in the tendon. The history of a sudden pop and loss of function is an important clue.
- Physical exam: Specific tests, such as squeezing the calf to check the Achilles tendon, to assess whether the tendon is intact.
- Ultrasound: A quick way to view the tendon and confirm a tear.
- MRI: Detailed imaging to define the location and extent of the rupture and plan treatment.
- X-rays: Used to check for an associated bone injury or a piece of bone pulled away by the tendon.
Treatment
Treatment depends on which tendon is torn, whether the tear is partial or complete, and the person's activity level. The goal is to restore the muscle-to-bone connection and rebuild strength.
- Immobilization: A cast, brace, or splint to hold the tendon in a healing position, sometimes used alone for partial tears.
- RICE and pain relief: Rest, ice, compression, and elevation, with over-the-counter pain relievers early on.
- Surgery: Many complete ruptures, such as quadriceps, patellar, or some Achilles tears, are repaired surgically by reattaching the torn ends.
- Physical therapy: A progressive program after the initial healing phase to rebuild strength, flexibility, and function.
Recovery often takes several months, and full return to sport may take longer. Following the rehabilitation plan closely lowers the risk of re-rupture.
Prevention
- Warm up before activity and stretch the muscles and tendons
- Strengthen and condition gradually, avoiding sudden spikes in training
- Treat tendinitis early rather than pushing through ongoing pain
- Use proper technique and supportive footwear
- Ask a doctor about tendon risks before steroid injections or fluoroquinolone antibiotics
- Allow adequate rest and recovery between hard sessions
When to See a Doctor
See a doctor promptly if you feel a pop followed by sudden weakness, pain, or inability to move a joint normally. Seek urgent or emergency care for:
- Inability to bear weight, straighten the knee, or push off the foot
- A visible gap, dent, or deformity at the tendon
- A deep cut over a tendon with loss of movement in a finger or hand
- Severe pain, rapid swelling, or a cold, pale limb
Frequently Asked Questions
What does a tendon rupture feel like?
Many people feel a sudden snap or pop, followed by sharp pain and a feeling that the muscle no longer works. The joint may be weak or impossible to move normally, and there can be swelling, bruising, or a gap where the tendon tore. Sudden loss of function after a pop should be checked promptly.
Does a ruptured tendon always need surgery?
No. Partial tears and some complete ruptures can heal with immobilization and physical therapy, while many complete ruptures, especially of the quadriceps, patellar, or some Achilles tendons, are repaired surgically. The best choice depends on the tendon, the tear, your age, and your activity level.
How long does a tendon rupture take to heal?
Recovery usually takes several months, and a full return to sport or heavy activity can take longer. Tendons heal slowly because of their limited blood supply, and rehabilitation is gradual to avoid re-rupture. Following the prescribed therapy program is key to regaining strength and function.
Can certain medications cause a tendon to rupture?
Yes. Corticosteroids, whether injected near a tendon or taken long term, and a class of antibiotics called fluoroquinolones can weaken tendons and raise the risk of rupture. If you develop new tendon pain while taking these, stop the activity and contact your doctor.
When is a torn tendon an emergency?
Seek urgent care if you cannot bear weight, straighten your knee, or push off your foot, if there is an obvious gap or deformity, or if a deep cut over a tendon leaves a finger unable to move. Numbness or a cold, pale limb also needs immediate attention.
References
- American Academy of Orthopaedic Surgeons (OrthoInfo). Tendon and ligament injuries.
- Mayo Clinic. Tendinitis and tendon injuries.
- MedlinePlus, U.S. National Library of Medicine. Tendon injuries.
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS).