What is the MCL?

The Medial Collateral Ligament (MCL) is one of the key ligaments in your knee. It runs along the inside of the joint and helps keep the knee stable by preventing it from bending inward.

MCL injuries are among the most common knee ligament injuries, especially in sports that involve sudden changes in direction, twisting, or direct blows to the outer side of the knee (e.g., soccer, rugby, netball).

Causes of MCL Injuries

• Direct impact to the outer side of the knee, pushing it inward.
• Sudden twisting motions during sports or physical activity.
• Overstretching or overuse, though less common than traumatic causes.

Symptoms

Patients with an MCL injury often report:

• Pain on the inside of the knee.
• Swelling and tenderness in the area.
• A feeling of instability or looseness in the knee.
• Difficulty bending or straightening the leg fully.
• In more severe cases, hearing or feeling a "pop" at the time of injury.

Diagnosis

A doctor may use:

• Physical examination (to test stability and tenderness).
• MRI or ultrasound scans (to assess the severity of the tear and check for other injuries, such as ACL damage).

MCL injuries are graded based on severity:

• Grade I (mild): Slight overstretching or small tear.
• Grade II (moderate): Partial tear, with more pain and swelling.
• Grade III (severe): Complete tear, significant instability, often associated with other ligament damage.

Watch video of Medial Collateral Ligament Reconstruction

Treatment Options

Non-Surgical Treatment (Most Common)

Most MCL injuries—especially Grades I and II—can be treated without surgery, provided they are assessed and managed early. A specialised rehabilitation programme can restore strength, flexibility, and stability.

Treatment usually includes:

• Rest and activity modification in the early phase.
• Ice, compression, and elevation to control swelling.
• Bracing for support and protection.
• Structured physiotherapy focusing on:
  
  • Regaining movement.
  • Strengthening surrounding muscles (quadriceps, hamstrings, glutes).
  • Balance and stability training.
  • Gradual return-to-sport exercises.

Recovery time can vary but typically ranges from a few weeks to 3 months or more.

Surgical Treatment

In some cases, particularly with complete ruptures (Grade III), associated ligament injuries (such as ACL or meniscus), or if non-surgical rehab does not restore function, surgery may be required.

• The most common surgical option is an MCL reconstruction, where a graft (from the patient’s own tissue or a donor) is used to rebuild the ligament.
• Post-surgery, patients follow a carefully structured rehabilitation programme.
• Full recovery may take 6–12 months, especially for athletes returning to high-level sport.

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