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MCL Tear: Causes, Symptoms and Treatment

A medial collateral ligament (MCL) tear is a knee injury caused by sideways force, often during sports. It leads to inner knee pain, swelling, and joint instability.

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A medial collateral ligament (MCL) tear is a knee injury caused by sideways force, often during sports. It leads to inner knee pain, swelling, and joint instability.

What Is a Medial Collateral Ligament Tear?

A medial collateral ligament (MCL) tear refers to a partial or complete rupture of the MCL, the ligament running along the inner side of the knee joint. This ligament plays a key role in stabilizing the knee against lateral (sideways) forces. MCL tears are among the most common knee ligament injuries, especially in athletes involved in contact and pivot sports.

Causes

An MCL tear typically results from a sudden force applied to the outer side of the knee, pushing the joint inward beyond its normal range of motion. Common causes include:

Sports injuries: Particularly in football, skiing, basketball, and martial arts.
Direct impact: A blow to the outer knee that overstretches the inner ligament.
Sudden direction changes or abrupt deceleration during athletic activities.
Falls involving a twisting motion of the knee.

MCL tears frequently occur alongside other knee injuries, most notably tears of the anterior cruciate ligament (ACL).

Grades of Severity

MCL tears are classified into three grades:

Grade I (Sprain): Mild overstretching of the ligament fibers without a tear. The knee remains stable.
Grade II (Partial tear): Partial rupture of the ligament with some degree of knee instability.
Grade III (Complete tear): Full rupture of the MCL resulting in significant knee instability.

Symptoms

Typical signs and symptoms of an MCL tear include:

Pain along the inner side of the knee, especially under load or with sideways pressure
Swelling and possible bruising over the medial knee
Feeling of instability: The knee may feel loose or give way
Reduced range of motion: Bending and straightening the knee may be painful
Tenderness along the medial joint line

Diagnosis

Diagnosis of an MCL tear involves:

Medical history and physical examination: The physician assesses the mechanism of injury and performs stability tests such as the valgus stress test to evaluate MCL integrity.
Imaging: Magnetic resonance imaging (MRI) provides detailed visualization of the extent of ligament damage and any associated injuries. X-rays are primarily used to rule out fractures.
Ultrasound: May be used for initial assessment of soft tissue injuries.

Treatment

Conservative Treatment

Most MCL tears, especially Grade I and Grade II, heal well without surgery. Treatment includes:

RICE protocol in the acute phase: Rest, Ice, Compression, and Elevation to reduce swelling and pain.
Immobilization: A knee brace or orthosis stabilizes the joint and allows protected movement during recovery.
Pain management: Anti-inflammatory medications such as ibuprofen or diclofenac help relieve pain and swelling.
Physiotherapy: Targeted exercises strengthen the knee muscles, restore range of motion, and improve proprioception (joint position sense) to prevent re-injury.

Surgical Treatment

Surgery may be required for complete Grade III tears with significant instability or when associated ligament injuries (e.g., ACL tears) are present. Surgical options include direct repair of the torn ligament or reconstructive procedures using a graft.

Recovery and Prognosis

Recovery time depends on the severity of the tear:

Grade I: Usually 2–4 weeks to full activity.
Grade II: Approximately 4–8 weeks of rehabilitation.
Grade III: 8–12 weeks with conservative treatment; several months following surgery.

The overall prognosis is favorable with appropriate treatment. With consistent physiotherapy, most patients are able to return to full sporting activity.

Prevention

Preventive measures for MCL tears include:

Regular strength training of the leg and knee muscles
Proprioceptive training to improve knee joint stability
Using knee braces during high-risk sports
Adequate warm-up routines before physical activity
Practicing proper movement mechanics during jumping and cutting

References

Reider, B.: The Orthopaedic Physical Examination. Elsevier Saunders, 2nd edition, 2005.
Phisitkul, P. et al.: MCL Injuries of the Knee: Current Concepts Review. Iowa Orthopaedic Journal, 2006; 26: 77–90. (PMID: 16789469)
Wijdicks, C. A. et al.: Injuries to the Medial Collateral Ligament and Associated Medial Structures of the Knee. Journal of Bone and Joint Surgery, 2010; 92(5): 1266–1280. (PMID: 20439679)

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