Medial collateral ligament injuries are classified into three grades based on severity:

1. Grade I:
   • Mild overstretching without structural damage, minimal pain, and no instability.
2. Grade II:
   • Partial tear of the ligament with moderate pain, swelling, and slight instability.
3. Grade III:
   • Complete tear of the medial collateral ligament, severe pain, significant swelling, and noticeable instability.

The causes of a medial collateral ligament tear are usually due to direct or indirect force impacts:

• Direct force impact:
  • A blow or impact to the outside of the knee leads to overstretching of the medial collateral ligament.
• Sports injuries:
  • Common in sports with sudden changes of direction, jumps, or body contact, such as soccer, basketball, or martial arts.
• Twisting:
  • Rotational movements of the knee, for example, during falls or abrupt movements on slippery surfaces, strain the medial collateral ligament.
• Overuse:
  • Chronic stress from repeated movements can weaken the ligament and lead to micro-injuries.

The symptoms of a medial collateral ligament tear vary depending on the severity of the injury:

- Pain:

- Acute pain on the inside of the knee, especially when pressure is applied or during movement.

- Swelling:

- Swelling of the knee occurs within a few hours after the injury.

- Instability:

- A feeling of uncertainty or instability in the knee, especially under load.

- Movement restrictions:

- Difficulty fully extending or bending the knee.

- Bruising:

- In more severe injuries, hematomas may be visible on the inside of the knee.

The diagnosis is made through a combination of medical history, clinical examination, and imaging techniques:

- Medical history:

- The doctor inquires about the accident, the type of strain, and the symptoms.

- Clinical examination:

- Tests such as the valgus stress test are performed to check the stability of the medial ligament.

- Imaging techniques:

- MRI: Visualization of the tear and any accompanying injuries such as meniscus or cruciate ligament injuries.

- Ultrasound: Examination of soft tissue damage and inflammation.

- X-ray: To rule out bone injuries or splinters.

Conservative Therapy

Most medial collateral ligament tears, especially Grade I and II, can be treated conservatively:

• Immobilization:
  • Use of a knee brace or splint to stabilize the joint.
• Cold Applications:
  • Reduction of swelling and pain through cold packs.
• Physiotherapy:
  • Exercises to strengthen the surrounding muscles and restore mobility.
• Medication Therapy:
  • Use of nonsteroidal anti-inflammatory drugs (NSAIDs) for pain relief and anti-inflammation.

Surgical Therapy

In cases of complete tears (Grade III) or additional injuries, surgery may be necessary:

• Reconstruction of the Medial Collateral Ligament:
  • Suturing or reattaching the torn ligament.
• Tendon Replacement:
  • Use of the body's own tendon material to stabilize the joint in cases of irreparable damage.
• Arthroscopic Procedures:
  • Treatment of accompanying injuries such as meniscus damage or cartilage injuries.

To prevent a medial collateral ligament tear, the following measures are recommended:

1. Regular warm-up: Warm up the joints before engaging in sports activities to avoid injuries.
2. Strengthening the muscles: Targeted training of the thigh and calf muscles to stabilize the knee.
3. Use of protective gear: Knee braces or orthoses can reduce the risk of injuries.
4. Technique training: Optimization of movement sequences in sports with a high risk of injury.
5. Avoiding overstrain: Ensure sufficient breaks and recovery phases to relieve the knee.