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MCL Sprain: Causes, Symptoms & Treatment

A medial collateral ligament sprain is an overstretching of the inner knee ligament without a complete tear. It commonly occurs during sports and causes pain, swelling, and tenderness on the inner side of the knee.

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Things worth knowing about "Medial collateral ligament sprain"

A medial collateral ligament sprain is an overstretching of the inner knee ligament without a complete tear. It commonly occurs during sports and causes pain, swelling, and tenderness on the inner side of the knee.

What Is a Medial Collateral Ligament Sprain?

A medial collateral ligament (MCL) sprain refers to an overstretching of the ligament on the inner side of the knee joint, without a complete rupture. The MCL runs along the inner (medial) side of the knee, connecting the femur (thigh bone) to the tibia (shin bone). It provides stability against forces that push the knee inward (valgus forces). In a sprain, the ligament fibres are stretched beyond their normal range and may sustain microscopic tears, but the overall structure of the ligament remains intact.

Causes

An MCL sprain is typically caused by a sudden, uncontrolled movement that applies a valgus force to the knee. Common causes include:

Sports injuries in football, skiing, basketball, or handball
Sudden changes of direction or twisting movements
Direct impact to the outer side of the knee
Falls with a twisted knee
Overuse combined with lower limb misalignment

Symptoms

Typical symptoms of an MCL sprain include:

Pain on the inner side of the knee, worsening with activity
Swelling and mild bruising along the medial joint line
Tenderness when pressing along the course of the ligament
A feeling of instability or weakness in the knee
Reduced range of motion

Unlike partial or complete ligament tears (Grade II and III), a Grade I sprain does not cause significant joint instability.

Classification by Severity

MCL injuries are classified into three grades:

Grade I (Sprain): Ligament stretched but intact, mild pain, no instability
Grade II (Partial tear): Partial rupture of fibres, moderate pain, mild instability
Grade III (Complete tear): Full rupture of the ligament, significant instability

Diagnosis

Diagnosis of an MCL sprain is typically made through:

Clinical examination: Palpation of the ligament, stability tests (e.g., valgus stress test)
Imaging: X-rays are taken to exclude fractures. MRI (magnetic resonance imaging) provides detailed soft tissue images and confirms the extent of the injury.
Ultrasound: May be used as a supplementary diagnostic tool

Treatment

Conservative Treatment

Most Grade I MCL sprains are treated conservatively. Immediately after the injury, the RICE protocol should be applied:

Rest: Stop all activity immediately
Ice: Apply ice to the area (not directly on the skin)
Compression: Apply a compression bandage to reduce swelling
Elevation: Keep the leg elevated to promote venous return

Further treatment measures include:

Physiotherapy with targeted strengthening and stabilisation exercises
Wearing a knee brace or orthosis for support and protection
Anti-inflammatory pain relief (e.g., ibuprofen) as recommended by a physician
Gradual return to sport under medical supervision

Recovery Time

A Grade I MCL sprain typically heals within 2 to 4 weeks, depending on the severity of the injury, the age of the patient, and overall health. Full return to sport should only take place once medically cleared.

When to See a Doctor

Medical attention should be sought promptly if there is severe pain, significant swelling, a feeling of knee instability, or no improvement within a few days. A physician can rule out more serious injuries such as a ligament tear or meniscal damage.

References

Reider B et al. – Medial collateral ligament injuries in athletes. American Journal of Sports Medicine, 1994.
Wijdicks CA et al. – Structures and Mechanics of the Medial Side of the Knee. Journal of Bone and Joint Surgery, 2010.
National Institute for Health and Care Excellence (NICE) – Sprains and strains: clinical guidance, www.nice.org.uk

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