Understanding MCL Injuries in Sports and the Workplace

The medial collateral ligament (MCL) is located on the inner side of the knee and helps keep the joint stable during movement. Injuries to the MCL are common in sports involving quick direction changes, sudden stops, or contact. They may also occur in workplaces where slips, falls, or awkward movements place sudden stress on the knee.

Understanding how these injuries happen and how to respond can support safer workplaces, sports environments, and communities.

How MCL Injuries Happen

An MCL injury occurs when the knee is pushed inward or twisted in a way that overstretches the ligament. This may result in:

• Mild sprain

• Partial tear

• Complete tear

Some people feel or hear a popping sensation at the moment of injury, followed by pain and swelling on the inner knee.

Recognizing Symptoms

Common symptoms of an MCL injury include:

• Pain or tenderness along the inside of the knee

• Swelling or stiffness

• Difficulty bending or straightening the knee

• Instability or difficulty walking

Symptoms may develop immediately or over several hours after the injury.

First Aid Awareness and When to Seek Care

Basic first aid measures can help reduce discomfort and swelling during the first 24–48 hours. These may include resting the leg, placing cold packs over the area, and avoiding activities that increase pain. First aid training teaches Canadians how to identify musculoskeletal injuries and when to recommend medical assessment.

If symptoms are severe, weight-bearing is difficult, or a major tear is suspected, the individual should be assessed by a healthcare provider.

Treatment and Recovery

Most mild to moderate MCL injuries heal within one to six weeks. Recovery may include:

• Physiotherapy or rehabilitation exercises

• Temporary bracing for stability

• Modified activity or return-to-work plans

• Gradual return to sport or workplace tasks

More severe tears may require surgical treatment, though many heal without surgery. A cautious return to activity helps prevent reinjury.

Safety, Training, and Prevention

MCL injuries are not limited to athletes. Many job sites—such as construction, trades, warehousing, and recreation—carry knee injury risks. Injury awareness, safe movement techniques, and early recognition reduce the likelihood of complications.

Canadian first aid and CPR training supports injury recognition and encourages safe responses in homes, sports environments, and workplaces. Training can also improve confidence when recommending medical care or assisting someone until help arrives.

Disclaimer

This educational content is not a substitute for medical assessment or treatment. If symptoms are serious or worsening, seek medical attention. First aid and CPR training helps Canadians recognize emergencies and respond safely.