LCL Tears: Causes, Symptoms, and Recovery Guide
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
A lateral collateral ligament (LCL) tear is a common knee injury, particularly among athletes, involving the tissue on the outside of the joint. Ranging from mild Grade 1 sprains to severe Grade 3 complete tears, these injuries cause pain, swelling, and instability. Recovery typically spans three to 12 weeks, utilizing rest, bracing, and physical therapy, with surgery reserved for the most severe cases.
Quick Answer: What is an LCL tear?
An LCL tear is damage to the lateral collateral ligament, the band on the outer knee connecting the thigh bone to the lower leg, graded from mild stretch to complete tear. Symptoms include pain, swelling and the knee buckling. Mild cases often heal in three to four weeks with icing and bracing, while severe tears may need surgery. [1]
What the research says
When several knee ligaments are torn together, surgery has outperformed nonoperative care. In a systematic review of multiligament knee injuries (at least two of the four major knee ligaments disrupted), surgically treated patients had higher Lysholm knee scores (85 vs 67) and returned to sport more often (41% vs 18%) than those treated nonoperatively, and surgery within 3 weeks gave higher mean Lysholm scores than delayed surgery (89 vs 82) (Vicenti et al., Injury, 2019 [2]).
Repairing the outer-knee ligament complex has failed more often than reconstructing it. An evidence-based systematic review found that repair of the posterolateral corner had a 37% failure rate versus 9% for reconstruction, and that surgically treated multiligament knees had more excellent or good IKDC scores than nonoperative ones (58% vs 20%). Both reviews examined multiligament-injured knees rather than isolated LCL sprains (Levy et al., Arthroscopy, 2009 [3]).
What is the lateral collateral ligament (LCL)?
The lateral collateral ligament (LCL) serves as a primary stabilizer for the knee joint, specifically preventing the leg from bending outward abnormally [1]. Located on the side of the knee facing away from the body, it connects the femur (thigh bone) to the fibula (the smaller bone in the lower leg). Unlike some other knee injuries, LCL tears are frequently accompanied by damage to other structures, such as the anterior cruciate ligament (ACL) or the meniscus.
The lateral collateral ligament (LCL) runs along the outside of the knee from the thigh bone to the fibula.
Athletes participating in sports that require frequent stop-and-go movements, jumping, or sudden changes in direction are at the highest risk. Common activities associated with these injuries include football, soccer, basketball, and skiing. While contact injuries are a frequent cause, LCL tears can also occur due to non-contact twisting or improper alignment during physical activity.
How are LCL tears graded by severity?
Medical professionals categorize LCL tears into three distinct grades based on the extent of the damage [1]. This grading system is essential for determining the appropriate treatment plan and estimating the expected recovery timeline.
Injury Grade | Severity Description | Estimated Recovery Time |
|---|---|---|
Grade 1 | Mild injury; the ligament is stretched but not completely torn. | 3 to 4 weeks |
Grade 2 | Moderate injury; a partial tear is present in the ligament. | 8 to 12 weeks |
Grade 3 | Severe injury; the ligament is completely torn or separated. | 8 to 12 weeks (may require surgery) |
Regardless of the grade, patients often experience an unstable feeling in the knee, which may persist even after they begin walking again. Reporting any continued instability, numbness, or tingling to a healthcare provider is critical for preventing long-term complications.
What are the symptoms of an LCL tear, and how is it diagnosed?
The hallmark symptoms of an LCL tear include pain, swelling, tenderness, and bruising concentrated on the outside of the knee [1]. Many patients describe a “popping” sensation at the time of injury, followed by the joint feeling as though it might lock up or buckle.
To diagnose the injury, a healthcare provider will perform a physical examination to assess the knee's range of motion and stability. They may also order imaging tests to confirm the diagnosis and check for other internal damage:
X-rays: Primarily used to rule out fractures or bone-related issues.
MRI (Magnetic Resonance Imaging): The most effective tool for visualizing soft tissue damage, including the extent of the LCL tear.
Ultrasound: A non-invasive method sometimes used to assess ligament integrity.
How are LCL tears treated and rehabilitated?
Treatment for LCL tears focuses on reducing inflammation and restoring joint stability [1]. For Grade 1 and Grade 2 injuries, conservative management is typically sufficient. This includes the “RICE” method—rest, ice, compression, and elevation—alongside the use of crutches and a hinged knee brace to limit weight-bearing.
Crutches and a hinged knee brace limit weight-bearing while the ligament heals.
For Grade 3 injuries or cases where multiple ligaments are damaged, surgery may be necessary. Surgical procedures often involve stitching the torn ligament back together, reattaching it to the bone, or reconstructing it using a graft from another tendon. Following surgery or conservative treatment, physical therapy is vital for strengthening the surrounding muscles and restoring a full range of motion.
How can LCL tears be prevented, and what is the long-term outlook?
While not all knee injuries can be prevented, certain measures can significantly reduce the risk of a recurrent LCL tear [1]. Individuals who have previously suffered a tear are at a higher risk for future injuries and should take extra precautions, such as wearing a supportive knee brace during sports.
Conditioning exercises that focus on strength and flexibility, as well as maintaining proper knee alignment during physical activity, are essential for long-term joint health. Patients should only return to normal activities once they can walk without a limp and have received clearance from their healthcare provider through a structured functional progression.
Strength and flexibility exercises help protect the knee and lower the risk of re-injury.
Conclusion
LCL tears are manageable injuries that require a combination of professional medical guidance and diligent at-home care. By understanding the severity of the injury and following a structured rehabilitation plan, most individuals can return to their previous level of activity. Prioritizing knee health through conditioning and protective measures is the best defense against future ligament damage.
Professional Consultation and Support
If you experience sudden knee pain, significant swelling, or a feeling of instability after a fall or sports injury, consult a sports medicine specialist or orthopedic professional immediately. Early diagnosis and the correct use of bracing are key to a successful recovery.
Frequently Asked Questions
What is an LCL tear?
An LCL tear is an injury to the lateral collateral ligament, which is the band of tissue on the outside of the knee that connects the thigh bone to the lower leg bone. [1]
How do I know if I tore my LCL?
Common signs include pain and swelling on the outside of the knee, bruising, and a feeling that the knee is unstable or might give out.
Can an LCL tear heal without surgery?
Yes, most Grade 1 and Grade 2 tears heal with rest, bracing, and physical therapy. Surgery is usually reserved for Grade 3 tears or multi-ligament injuries.
How long does it take to recover from an LCL tear?
Recovery typically takes 3 to 4 weeks for mild cases and 8 to 12 weeks for moderate to severe injuries.
What is the RICE method for knee injuries?
RICE stands for Rest, Ice, Compression, and Elevation, which helps reduce pain and swelling in the days following an injury.
Should I use crutches for an LCL tear?
Healthcare providers often recommend crutches for a period of time to limit the weight put on the injured knee while it heals.
Are LCL tears common in athletes?
Yes, they are particularly common in sports that involve sudden stops, jumping, and twisting, such as football and soccer.
What are the complications of an LCL tear?
Complications can include chronic joint instability, stiffness, and an increased risk of tearing the ligament again in the future.
When can I return to sports after an LCL tear?
You should only return to sports once you can walk without a limp and have completed a functional progression approved by your doctor.
Is an LCL tear always an isolated injury?
No, LCL tears are often accompanied by other knee problems, such as an ACL tear or a meniscus injury.
Related Reading
Valgus and Varus Stress Tests: Checking Knee and Elbow Ligaments explains the exams used to check the knee and elbow collateral ligaments.
References
Cleveland Clinic. LCL Tears. Cleveland Clinic. August 19, 2021. https://my.clevelandclinic.org/health/diseases/21710-lcl-tears
Vicenti G, Solarino G, Carrozzo M, et al. Major concern in the multiligament-injured knee treatment: a systematic review. Injury. 2019;50 Suppl 2:S89-S94. PMID: 30797544. DOI: https://doi.org/10.1016/j.injury.2019.01.052
Levy BA, Dajani KA, Whelan DB, et al. Decision making in the multiligament-injured knee: an evidence-based systematic review. Arthroscopy. 2009;25(4):430-438. PMID: 19341932. DOI: https://doi.org/10.1016/j.arthro.2009.01.008
Medical disclaimer
This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. The clinical information in this guide reflects source material last reviewed in August 2021.
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