How Long Does an MCL Injury Take to Heal?

Have you ever taken a hard kick, been caught awkwardly in a clinch, or had your knee forced inwards during sparring? If so, you might have felt that horrible pain on the inside of your knee. An MCL injury could be the cause of this pain.

When clients come to me with such an injury, the first question they ask is: “How long until I can train again?” Unfortunately, there isn’t one answer that applies to everyone. It depends on how badly the ligament has been injured, how the knee is behaving, and what you are asking it to do. For combat athletes, returning to everyday life isn’t the same as being ready to kick, spar and fight again.

What is the MCL?

The medial collateral ligament, or MCL, runs along the inside of your knee. Its job is to help provide stability and resist forces that push the knee inwards.

In combat sports, there are plenty of ways this area can get stressed: a kick gets checked awkwardly, your foot is planted while your body turns, you get caught in a strange position during clinching, or your knee takes a direct impact. The result can range from a mild ligament strain to a more significant tear. That is why simply saying “I have torn my MCL” doesn’t tell us how long recovery will take.

So how long does it actually take?

MCL injuries are often described in three grades:

Grade 1

This is generally a mild injury where the ligament has been overstretched but remains structurally intact.

You may experience some tenderness and discomfort, but the knee is usually relatively stable.

Some athletes can return to activity within a few weeks, depending on symptoms and how well they progress through rehabilitation.

Grade 2

This involves more significant damage to the ligament and can come with more pain, swelling and some looseness around the knee.

Recovery is usually longer than a grade 1 injury and can take several weeks.

Returning to combat sports will generally require more than simply waiting for the pain to disappear.

Grade 3

This is a complete tear of the MCL.

These injuries can take considerably longer to recover from and may involve significant instability. The exact timeline depends on the individual injury and whether there are other structures involved.

It is important to note: The MCL may not be the only thing that is injured.

If the injury happened through a significant twisting mechanism, there can sometimes be damage to other structures in the knee as well. Therefore, it is vital to get the injury properly assessed.

When should you get your knee assessed?

Personally, I would recommend getting your knee checked if you have significant pain or swelling, difficulty putting weight through the leg, a feeling that the knee is unstable, or symptoms that are not improving. If you had a significant twisting injury or direct impact and are not sure what you have done, do not try to diagnose the grade yourself.

An assessment can help determine what you are dealing with and whether you need further investigation.

What does rehabilitation look like?

Early on, the focus is usually on settling the symptoms and maintaining as much movement and strength as appropriate. As the knee improves, rehabilitation becomes more active. This can include strengthening the muscles around the knee and hip, balance work, single-leg exercises and gradually increasing the loads placed through the injured leg. Eventually, the exercises need to become more sport-specific.

For a Muay Thai fighter, that might mean progressing towards controlled kicking, pivoting and changing direction.

For a boxer, footwork and movement become increasingly important.

For an MMA athlete, you also need to consider the demands of wrestling and grappling.

The goal isn’t simply: “Does it hurt?”

It’s: “Can your knee handle what you are asking it to do?”

One of the hardest parts of recovery for a figher, is not to rush. A fight is approaching, and after months of preparation, they suffer an injury and suddenly become fixated on the calendar. I completely understand the need to get back to it as quickly as possible, but trying to force a ligament to heal faster because a fight date is on the horizon, does not necessarily make it happen.

The best approach is to identify what can be safely done at the moment, preserve as much fitness as possible, and gradually rehabilitate the knee. At times, this might mean focusing on other parts of a game while the knee recovers. This strategy can significantly impact both mental and physical well-being.

Feeling better does not necessarily mean you are ready to fight and this is where some combat athletes can cause themselves more issues. For example, you wake up one morning and the knee feels much better. You can walk normally. You can jog. So you think: “I’m good to go.” But fighting puts very different demands on the knee. Fighters need to be able to kick, check kick, change direction, pivot, defend takedowns, move around the ring and absorb unexpected forces. Being able to walk without pain is only one step. Before returning to full training, fighters want to be assured that the knee can tolerate the movements and loads demanded by their sport.

Final Thoughts

So rather than asking: “How long until I can train again?"

The question to ask is: “What does my knee need to be able to do before I return to full training?”

Two people can have what sounds like a similar MCL injury and have very different recovery experiences.

Your rehabilitation should be based on how the knee is progressing, not just a date written on a calendar.

And if you’re a fighter, the final goal isn’t simply getting back to walking normally. It’s getting your knee ready for the demands of your sport.