Medial Knee Pain (Inside Of The Knee)

Medial knee pain is a pain on the inside of the knee which usually comes on gradually as opposed to a sudden acute knee injury. If you are not sure what your injury is then why not try our symptom checker? Pain on the inside of the knee is usually an acute injury caused by a sudden trauma, however, it can come on gradually over time with poor biomechanics and overuse.

On this page:

  • Common causes of pain on the inside of the knee
  • Less common causes of pain on the inside of the knee
  • Other causes

Common causes of medial knee pain

Medial meniscus injuries

Medial Meniscus TearA torn meniscus is a tear of the semi-circular cartilage in the knee joint causing pain on the inside of the knee. It is commonly injured through direct impact in contact sports or twisting but can also occur in older athletes through gradual degeneration. Treatment depends on how bad the injury is and may require surgery.

Symptoms include pain on the inside of the knee which may be of sudden onset but can also occur gradually. The patient will usually experience pain when fully bending the knee or squatting down. There may be swelling present but not always and the patient may also complain of the knee locking or giving way.

There will be tenderness along the joint line on the inside of the knee and range of motion is likely to be restricted. A doctor or sports injury professional can confirm the diagnosis with the aid of specific assessment tests including McMurray's test (play video) and Apley's test and may refer to an MRI scan.

Patellofemoral pain

Patellofemoral Pain SyndromePatellofemoral Pain Syndrome (PFPS) is a generic term used to describe patella pain, at the front of the knee around the patella (kneecap). Symptoms include an aching pain in the knee joint, particularly at the front of the knee around and under the patella.

There is often tenderness along the inside border of the kneecap and swelling will sometimes occur after exercise. Patellofemoral pain is often worse when walking up and down hills or sitting for long periods of time. Other signs a sports medical practitioner may pick up include a click or cracking sound when bending the knee, wasting of the quadriceps muscles if the injury is an old one and tight muscles around the knee joint.

Read more on Patellofemoral pain syndrome.

Other causes of medial knee pain

Synovial plica

Synovial Plica SyndromeThe synovial plica is a synovial fold found along the inside of the kneecap causing pain and discomfort. It is sometimes be confused or misdiagnosed as patellofemoral pain syndrome as the symptoms can be similar. Symptoms of a synovial plica include a sharp pain at the front inside edge of the kneecap. The pain may also be towards the back of the patella. The athlete may feel a sharp pain when squatting. A synovial plica may sometimes feel like a thickened band under the inside of the kneecap.

The knee joint is lubricated with a substance called synovial fluid. This fluid is surrounded by and produced by a sheath called the synovial sheath. The synovial plica is a synovial fold found along the inside border of the kneecap. The synovial sheath may also become more widely inflamed. This is known as knee synovitis.

A synovial or patella plica should be considered the main cause of pain only when the patient has failed to respond to treatment of patello femoral pain syndrome. A surgeon may perform an arthroscopy to look into the joint, identify a plica and remove it.

Pes anserinus injury

Pes anserine tendonitis is inflammation of a tendon on the inside of the knee causing pain on the lower inside of the knee, particularly when lifting the upper leg. A bursa or small fluid sac can also become inflamed from repetitive use.

Pes Anserine Tendonitis is often difficult to distinguish from a medial ligament injury because the symptoms are similar and both are likely to be painful when stressing the inside of the knee joint.

The Pes Anserine, also known as pes anserinus or the goose's foot is the combined tendon of the semitendinosus muscle (one of the hamstrings), Sartorius (the strap like muscle which crosses the front of the thigh) and gracilis muscle which is one of the long adductor muscles. They all attach together to the tibia or shin bone on the inner part of the lower knee.

In this area, there is also a bursa, called the anserine bursa which lies between this combined tendon and the Tibia bone underneath. This bursa may become inflamed due to repetitive friction in sports such as cycling, running and swimming, especially breaststroke. This results in bursitis and / or tendinopathy (sometimes called tendonitis),

Treatment approach should be to treat the symptoms as well as the cause of the tendon or bursa inflammation. Treatment of symptoms includes resting from any aggravating activities and applying ice or cold therapy to reduce pain and inflammation.

Ice can be applied for 10 minutes every hour initially for the first 24 to 48 hours reducing to 3 or 4 times a day as required. A doctor may prescribe anti-inflammatory medication such as ibuprofen which may help reduce pain and inflammation. Stretching the surrounding muscles such as the quadriceps, hamstrings and adductor muscles may help.

A therapist may apply electrotherapy such as ultrasound and if treatment is not successful then corticosteroid injections have been shown to be effective.

The second phase of treatment should be to consider what may have caused the injury and to correct the problem. It may be something as simple as having tight hamstring muscles and in which case these should be stretched regularly and sports massage applied to improve elasticity.

Other common causes include obesity, overpronation of the foot where the foot flattens or rolls in too much when running as well as a valgus knee deformity where the knee falls or bows inwards. A knee support or brace may help.

Medial knee ligament sprain

Medial ligament sprainAn MCL sprain is a tear to the ligament on the inside of the knee joint, caused either by a direct impact to the outside of the knee or twisting. Symptoms include sudden onset pain located on the inside of the knee with rapid swelling. Medial knee ligament injuries are graded from one to three depending on the severity and will range from mild tenderness to severe pain and incapacity. Often MCL sprains occur in conjunction with a medial cartilage meniscus injury. Read more on:


OsteoarthritisOsteoarthritis is a common cause of knee pain and usually affects people over fifty years old. It occurs when cartilage which protects the bones degenerates. Pain develops gradually over time and often causes stiffness and sometimes swelling. Osteoarthritis knee pain may start as a deep aching pain in the inner knee that is worse after exercise. Stiffness in the joint is common, particularly in the morning, however, this may reduce with movement as the joint produces lubricating synovial fluid. Sometimes a clicking or cracking noises are heard when moving the knee.

As yet there is no cure for arthritis. However, a number of treatments may slow the progression of the disease. Some specialist knee supports or braces have been proven to provide pain relief in some cases of medial compartment osteoarthritis, by reducing the load on that compartment. NSAID's- Non-Steroidal Anti-Inflammatory Drugs such as ibuprofen can provide some temporary pain relief. Weight loss can help as obesity is associated with the onset of osteoarthritis and can have a significant effect on slowing the disease progression.

Read more on Osteoarthritis

Referred pain

Pain on the inside of the knee can result from injuries or conditions elsewhere, especially, in the hip and lower back. The sciatic nerve gets pinched or compressed radiating pain down the leg.

Read more on sciatica.

Other causes

Other causes of medial knee pain include Tumors in young athletes, Slipped capital femoral epiphysis, Perthes' disease and referred pain from the hip.