MCL Injury

What is an MCL injury?

The medial collateral ligament — the MCL — runs along the inner side of your knee. It's one of the key structures that keeps the joint stable, particularly when you twist, pivot or take a force from the side.

An MCL injury happens when this ligament is stretched or torn. It's one of the most common knee injuries in sport, but it can also happen in everyday life — a trip, a fall, or any movement that forces the knee inward.

MCL injuries are classified into three grades:

• Grade 1 — the ligament is stretched but intact

• Grade 2 — a partial tear

• Grade 3 — a complete rupture, which may involve other structures in the knee

The grade of your injury has a significant bearing on how it should be managed — which is why an accurate diagnosis from the outset matters.

What does it feel like?

Pain along the inner side of the knee is the most common symptom, often with tenderness directly over the ligament.

You may also notice:

• Swelling around the inner knee

• Stiffness, particularly after rest

• A sense that the knee isn't quite right when turning or changing direction

• In more significant injuries, a feeling that the knee might give way

Symptoms vary considerably between individuals and between grades of injury. What feels manageable in one person can represent a more significant tear in another — which is why the examination matters as much as the symptoms.

How is it diagnosed?

Diagnosis starts with a careful clinical assessment. In experienced hands, examination alone can tell you a great deal — where the injury is, how the ligament is behaving, and whether other structures might be involved.

MCL injuries don't always occur in isolation. Depending on the mechanism and the forces involved, the ACL, meniscus or other ligaments can sometimes be affected alongside the MCL. Identifying this early is important, as it changes the management.

An MRI scan is arranged when the clinical picture requires it — not routinely, but when it adds meaningful information.

What are the treatment options?

Treatment for an MCL injury depends on the grade of the tear, your lifestyle, and your goals — whether that's returning to competitive sport, getting back to work, or simply moving without pain.

There is no single path that's right for everyone, and the right approach isn't always obvious from symptoms alone.

What can be said is that most MCL injuries, managed well and from the right starting point, do very well. What "managed well" looks like in your specific case is something Nev will work through with you at your consultation.

When should you get it checked?

Seek a specialist assessment if:

• Pain on the inner side of the knee isn't settling within a few days

• The knee feels unstable or unreliable

• Swelling is persistent

• You're struggling to return to sport or normal activity

• You've been seen elsewhere but still don't feel confident about what's happened or what to do next

An accurate diagnosis early in the process makes a real difference — both to the speed of recovery and to your confidence in knowing what you're dealing with.