Medial Collateral Ligament (MCL) Sprain

MCL sprain

Medically reviewed by Dr. Chaminda Goonetilleke, 5th Dec. 2021

A Medial collateral knee ligament sprain or MCL sprain is a tear of the ligament on the inside of the knee. It usually occurs suddenly from twisting or direct impact. However, it may develop gradually over time.

Hinged knee braces

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MCL sprain symptoms

Valgus stress test

Symptoms of a Medial knee ligament sprain depend on the severity of your injury and include:

  • Pain and/or tenderness on the inside of your knee.
  • You may or may not have swelling depending on how bad your MCL injury is.
  • Your knee may feel uncomfortable or week.
  • More severe sprains will be significantly painful with rapid swelling.
  • You will have a positive result for the valgus stress test.

MCL sprains are graded 1, 2 or 3 depending on severity.


Medial knee ligament deep and superficial

The medial collateral ligament (or MCL for short) connects the thigh bone (femur) to the shin bone (tibia) on the inside of your knee.

It provides stability to your knee, preventing it from moving sideways. In particular from forces applied to the outside of the knee.

The MCL itself has two parts to it:

  • A deep section of ligament which attaches to the cartilage and capsule in the knee.
  • Also a superficial band which originates in the lower part of the femur and attaches to an area in the upper and inside surface of the tibia.

What causes an MCL sprain?

MCL sprains usually occur suddenly as acute knee injuries, however, they can develop gradually over time.

Sudden onset/acute injuries

Medial collateral ligament injuries are common in contact sports such as football, rugby, and martial arts. However, they can also occur in daily activities such as falling and/or twisting action your knee joint.

Direct trauma

MCL sprain mechanism

Injury to the MCL often occurs from a direct impact to the outside of your knee. In particular, when your knee is slightly bent. As a result, the medial ligament on the inside of your knee becomes stretched and if the force is great enough, some or even all of the fibres will tear.

The deep part of the ligament is prone to becoming damaged first. This may lead to a medial cartilage meniscus injury.


Twisting your knee can also cause a medial ligament sprain, which may also result in an ACL tear.

Attempting to turn quickly, when your foot is firmly planted to the ground will result in a twisted knee. As a result, the inside of the joint opens, tearing the medial ligament.

Gradual onset MCL sprains

Repetitive sideways forces on your knee (known as valgus forces) can gradually, over time lead to an MCL sprain.

For example, repeatedly kicking a football with the inside of your foot. Or kicking in martial arts.

However, gradual onset pain on the inside of your knee should also be considered for pes anserine tendinopathy or bursitis.

Treatment for medial ligament sprains

Treatment for medial ligament sprains consists of immediate first aid followed by a full MCL rehab program.

Cold therapy & compression

Immediate first aid is to apply the PRICE principles (Rest, Ice, Compression, Elevation) as soon as possible. Apply ice or a cold therapy wrap for 10 to 15 minutes and repeat every hour. You can reduce the frequency as your symptoms improve.

We recommend for MCL sprains:

Cold knee wrap

Cold therapy Knee Wrap

A simple but effective reusable knee wrap provides hot and cold therapy and compression. Easy to apply useful for other body areas.

Do not apply ice directly to the skin because it may cause ice burns. Instead, use a wet tea towel or even better, a commercially available cold therapy wrap. These are more convenient to use and will apply compression to your knee as well.


You should rest from training or any activities which are painful. This is important to allow healing to take place. If you continue to train or do any activity which causes pain, this will only prevent healing and prolong your recovery.

Wear a knee brace

Wear a compression bandage or knee support to help reduce any swelling and protect your joint. This is particularly important in the early stages.

We recommend for MCL sprains:

Hinged knee brace

Hinged Knee Braces

Hinged knee braces have solid metal down the sides to provide maximum lateral protection and support.

Later, a hinged knee brace is best, particularly for grade 2 and 3 injuries. These have solid metal supports down the sides to prevent sideways movement of the joint.

More severe grade 2 and full grade 3 injuries may require a limited motion hinged knee brace. These enable you to restrict the amount of bend in your knee joint.


A professional therapist may use electrotherapy treatments such as Ultrasound to help control swelling and pain. Ultrasound works by sending high frequency sound waves into the tissues. This results in a micro massage effect and helps to reduce swelling.

MCL sprain taping

Knee ligament taping

Taping your knee joint can also provide a high level of support and protection. Sports taping is useful in the early stages, as well as later on when you return to full training.

Sports massage

MCL massage

You should avoid massage to the injured ligament in the early, acute stage.

Later however, as your ligament starts to heel, light cross friction massage may help. It is particularly useful if you have persistent pain during the later stages of rehabilitation.

Do I need surgery?

Most medial ligament sprains do not require surgical treatment. However, if you have additional damage to the joint such an ACL tear then you may benefit from having surgery.

However, it is controversial as to whether there is any advantage, even with grade 3 injuries to treating them surgically as opposed to bracing and rehabilitation exercises.

How long will it take to recover?

  • A mild MCL injury or grade one sprain should take 3 to 6 weeks to make a full recovery.
  • A more severe grade 2 or grade 3 injury may take 8 to 12 weeks.

Rehabilitation & exercises

Our MCL sprain rehabilitation program has been created by International Rugby Physiotherapist Phil Pask and takes you step by step from injury to full fitness.

It is criteria based rather than timeline so you progress at your own pace, regardless of how severe your injury is.

It takes you from initial injury to full competition fitness and tells you exactly what treatment and exercises you need to do each day.

Mobility & stretching

Initially, mobility exercises are done to restore full, pain-free range of movement. In the early stages, isometric strengthening exercises (static muscle contractions) can be done to help maintain muscle strength and prevent muscle wasting whilst the ligament heals.

Activation exercises

These exercises are aimed at maintaining your hip abductor muscles (outside of the hip). It is important these muscles keep firing and stay in good condition ready for the demands later in the program.


As your ligament heals, strengthening exercises such as mini squats, leg press, and step-ups can be done. But movements involving a change of direction or sideways stresses should be avoided until much later in the rehabilitation program.

Movement control

These are proprioception type exercises, aimed at improving your balance, control and spacial awareness.

Functional exercises

These bridge the gap between basic rehabilitation and sports specific type drills. They begin with walking drills and progress through skipping type sprint drills and agility training.

Expert interview

Elite Football Physiotherapist Neal Reynolds explains MCL sprain treatment

Recommended products

We recommend the following products to help treat and recover from medial knee ligament sprains:

Cold wrap

Cold compresion wrap

A cold therapy and compression wrap is essential first aid. It reduces pain and swelling and can also be used to apply heat later in the rehabilitation program.

Resistance bands

Resistance bands

Resistance bands are important for most sports rehabilitation and enable you to exercise any muscle from the comfort of your own home.

Foam roller

A foam roller is an excellent piece of kit which can be used in place of massage to treat calf injuries. They are also excellent when use regularly as part of your warm up to help prevent future injury and improve performance.

Hinged knee brace

Hinged knee brace

A hinged knee brace protects the joint and helps reduce any swelling. It has solid metal supports down the sides to prevent sideways movement of the joint. Grade 2 or 3 injuries may require a limited motion hinged knee brace.

References & research

MCL Sprain Rehabilitation Program

Our step by step MCL sprain rehabilitation program takes you from initial injury to full fitness.

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MCL rehab

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