Multiligament Injury
A Multiligament Knee Injury (MLKI) occurs when two or more of the major ligaments of the knee joint are torn or severely damaged at the same time.
When more than one of these ligaments is injured simultaneously, the knee becomes unstable and unable to properly support body weight or movement.
These injuries are often associated with high-energy trauma such as road traffic accidents, sports collisions, or severe falls.
When more than one of these ligaments is injured simultaneously, the knee becomes unstable and unable to properly support body weight or movement.
These injuries are often associated with high-energy trauma such as road traffic accidents, sports collisions, or severe falls.
What is Multiligament Injury
Definition
A Multiligament Knee Injury (MLKI) occurs when two or more of the major ligaments of the knee joint are torn or severely damaged at the same time. The knee joint is stabilized by four primary ligaments:
- Anterior Cruciate Ligament (ACL)
- Posterior Cruciate Ligament (PCL)
- Medial Collateral Ligament (MCL)
- Lateral Collateral Ligament (LCL)
When more than one of these ligaments is injured simultaneously, the knee becomes unstable and unable to properly support body weight or movement. These injuries are often associated with high-energy trauma such as road traffic accidents, sports collisions, or severe falls.
Types of Multiligament Knee Injuries
- ACL + MCL Injury
- ACL + LCL Injury
- PCL + MCL Injury
- PCL + LCL Injury
- ACL + PCL Injury
- ACL + PCL + Collateral Ligament Injury
- Knee Dislocation with Ligament Injury
Orthopedic surgeons commonly classify MLKIs based on the combination of ligaments involved.
1. ACL + MCL Injury
- Most common multiligament injury
- Often occurs in sports such as football, skiing, or basketball
- Causes knee instability and medial knee pain
2. ACL + LCL Injury
- Results in rotational instability of the knee
- Often associated with posterolateral corner injuries
3. PCL + MCL Injury
- Usually caused by direct trauma to the front of the knee
- Common in dashboard injuries during car accidents
4. PCL + LCL Injury
- Causes posterolateral knee instability
- Often associated with damage to surrounding soft tissues
5. ACL + PCL Injury
- Known as a bicruciate ligament injury
- Leads to severe knee instability
6. ACL + PCL + Collateral Ligament Injury
- Very severe injury involving three ligaments
- Often requires complex reconstructive surgery
7. Knee Dislocation with Ligament Injury
- The most severe form of MLKI
- Multiple ligaments rupture and the knee joint dislocates
- May involve nerve or blood vessel injury
Causes of Multiligament Knee Injuries
Common causes include:
- High-impact sports injuries (football, rugby, skiing)
- Road traffic accidents
- Falls from height
- Severe twisting of the knee
- Industrial accidents
Symptoms
Patients with MLKI may experience:
- Severe knee pain
- Swelling around the joint
- Inability to bear weight
- Knee instability or “giving way”
- Limited range of motion
- Bruising and deformity in severe cases
In some cases, vascular or nerve injury may cause:
- Numbness in the leg
- Weak foot movement
Diagnosis
Orthopedic specialists diagnose MLKI using:
Clinical Examination
Tests for ligament stability and knee alignment.
Imaging Tests
- X-ray – checks for fractures or joint dislocation
- MRI Scan – gold standard for ligament injuries
- CT Scan – used in complex trauma cases
- Doppler Ultrasound or Angiography – if vascular injury is suspected
Surgical Treatment Options
1. Ligament Reconstruction Surgery
Damaged ligaments are replaced with grafts.
Common graft types:
- Hamstring tendon graft
- Patellar tendon graft
- Quadriceps tendon graft
- Donor graft (allograft)
This is the most common surgical treatment for MLKI.
2. Ligament Repair Surgery
- Torn ligament is repaired rather than replaced
- Usually done when injury is acute and tissue quality is good
3. Combined Reconstruction Surgery
Multiple ligaments are reconstructed in a single surgical procedure.
Example:
- ACL reconstruction
- PCL reconstruction
- Posterolateral corner repair
4. Staged Surgery
Sometimes surgery is done in multiple stages:
Stage 1:
- Stabilize knee and repair collateral ligaments
Stage 2:
- Reconstruction of cruciate ligaments
5. Arthroscopic Surgery
Minimally invasive technique using a small camera (arthroscope) to repair or reconstruct ligaments.
Benefits:
- Smaller incisions
- Less pain
- Faster recovery
Complications if Untreated
Untreated MLKI may lead to:
- Chronic knee instability
- Early arthritis
- Limited mobility
- Persistent pain
- Difficulty walking or running
When to See an Orthopedic Doctor
Consult an orthopedic specialist immediately if:
- Severe knee pain after trauma
- Knee deformity or dislocation
- Inability to walk
- Knee instability
- Significant swelling within hours of injury
Early diagnosis and treatment significantly improve outcomes.