ConditionInjuries & poisoning
Ligament Tear (Torn Ligament)
A ligament tear is a partial or complete rupture of a ligament, the tough band of tissue that connects bone to bone and holds a joint stable. It usually happens with a sudden twist, fall or impact, often with a pop, rapid swelling and a joint that feels loose or gives way. Doctors call it a sprain and grade it 1 to 3. Most partial tears heal with protection and rehab within weeks, while some complete tears, such as many ACL ruptures, need surgery.
Also called: Torn ligament, ligament rupture, severe sprain, grade 3 sprain
At a glance
- What it is
- A tear of a ligament, ranging from a stretch (grade 1) to a full rupture (grade 3).
- Common sites
- Ankle, knee (ACL, MCL), wrist, thumb, shoulder (AC joint).
- Signs
- A pop, quick swelling, bruising, pain, and a joint that feels unstable.
- Diagnosis
- Exam with stress tests; X-ray to rule out fracture; MRI or ultrasound for severe tears.
- Treatment
- Protection, early guided movement and rehab; surgery for some complete or unstable tears.
When to get help
Call 911 or go to the ER
- A visibly deformed joint, bone through the skin, or a cold, pale or numb limb below the injury: call 911 or your local emergency number
- A knee injury with a joint that is dislocated or a foot that is cold or numb (possible artery damage)
See a doctor within a day or two
- A pop with rapid swelling within a few hours, especially in the knee
- Unable to bear weight or use the joint, or bony tenderness suggesting a fracture
- A thumb that cannot pinch firmly after a fall or ski pole injury (possible skier's thumb)
- Severe pain, numbness or tingling after injury
Book a routine appointment
- A joint that keeps giving way weeks after an injury
- Pain and swelling not improving after 1 to 2 weeks of home care
Usually safe to manage at home
- A mild sprain with minimal swelling where you can walk or use the joint with some discomfort
Sprain vs ligament tear
A sprain is any injury to a ligament. "Ligament tear" usually describes a more serious sprain:
| Grade | Damage | Symptoms | Typical recovery |
|---|---|---|---|
| 1 | Stretched, microscopic tears | Mild pain and swelling, stable joint | 1 to 3 weeks |
| 2 | Partial tear | Moderate pain, swelling, bruising, some looseness | 3 to 8 weeks |
| 3 | Complete tear (rupture) | Severe swelling, often a pop, unstable joint; pain may be less than expected | 2 to 6 months; some need surgery |
A strain is a different injury, to a muscle or tendon.
Common ligament tears
Ankle
The outer ligaments, especially the anterior talofibular ligament, are torn when the foot rolls inward. See ankle sprain. Repeated tears can lead to chronic ankle instability.
Knee
- ACL tear: from pivoting, landing or sudden stops; a pop, rapid swelling and a knee that gives way. Often needs reconstruction for active people.
- MCL injury: a blow to the outside of the knee; usually heals without surgery in a brace.
- PCL injury: dashboard injuries or falls onto a bent knee.
- multi-ligament injuries can come with knee dislocation, an emergency.
Wrist and hand
- wrist sprains, including the scapholunate ligament, which can cause long-term instability
- skier's or gamekeeper's thumb: ulnar collateral ligament tear at the base of the thumb; complete tears often need surgery
Shoulder
- AC joint separation: a fall onto the shoulder tears ligaments holding the collarbone to the shoulder blade
Symptoms
- a pop or tearing feeling at the time of injury
- pain, often sharp at first
- swelling within minutes to hours; rapid swelling in the knee suggests bleeding into the joint
- bruising
- instability: the joint gives way or feels loose
- reduced range of motion and difficulty bearing weight
Diagnosis
- examination: tenderness, swelling and stress tests (for example, the Lachman test for the ACL, the anterior drawer test for the ankle)
- X-ray: rules out fractures, including small avulsion fractures where the ligament pulls off a fragment of bone
- MRI: shows ligament tears and associated cartilage, meniscus or bone injuries
- ultrasound: useful for some ligaments, such as the thumb
Treatment
First aid (first 48 to 72 hours)
- protect the joint with a brace, splint or crutches
- rest from painful activities but keep gently moving nearby joints
- ice for 15 to 20 minutes every 2 to 3 hours
- compression with an elastic bandage
- elevation above heart level
- pain relief: acetaminophen (paracetamol) or ibuprofen, following the label dose
Rehabilitation
Physical therapy is key for grade 2 and 3 tears:
- restore range of motion
- rebuild strength around the joint
- retrain balance and proprioception
- sport-specific training before returning to play
Surgery
Surgery is considered for:
- ACL tears in active people or those with instability
- complete thumb ulnar collateral ligament tears with a displaced end
- multi-ligament knee injuries
- high-grade AC joint separations in some cases
- chronic instability that does not improve with rehab
Recovery
Ligaments have a limited blood supply, so healing is slow. Most grade 1 and 2 injuries recover in weeks. Complete tears can take months, and full recovery after ACL reconstruction usually takes 9 to 12 months. Returning to sport too early increases the risk of re-injury.
Frequently asked questions
How do I know if I tore a ligament?
Signs include a pop at the time of injury, rapid swelling, bruising, pain and a feeling that the joint is loose or gives way. Difficulty bearing weight is common. A doctor can test joint stability and may order an X-ray or MRI.
Can a torn ligament heal on its own?
Partial tears usually heal on their own with protection and rehab. Some complete tears, like those of the MCL or ankle ligaments, often heal without surgery. Others, such as most complete ACL tears, do not heal well and may need reconstruction.
How long does a ligament tear take to heal?
Mild sprains heal in 1 to 3 weeks, partial tears in 3 to 8 weeks, and complete tears in several months. After ACL reconstruction, return to sport typically takes 9 to 12 months.
Is a torn ligament worse than a broken bone?
It can be. Bones often heal stronger and faster than ligaments, which have a poor blood supply and can leave a joint permanently unstable. Both need proper treatment and rehab.
What is the difference between a sprain and a ligament tear?
A sprain is any ligament injury. Mild sprains stretch the ligament; more severe sprains are partial or complete tears. Doctors grade them 1 to 3, with grade 3 meaning a complete ligament tear.
Sources
This guide was written from current patient and clinical guidance, including:
- American Academy of Orthopaedic Surgeons: Sprains, Strains and Other Soft-Tissue Injuries
- American Academy of Orthopaedic Surgeons: Anterior Cruciate Ligament (ACL) Injuries
- NIAMS: Sprains and Strains
- MedlinePlus: Sprains and strains
- NHS: Sprains and strains