What Is Plica Syndrome?

Plica syndrome is a cause of anterior or inner knee pain. It occurs when a synovial fold, usually the medial plica, becomes thickened and irritated inside your knee joint. This irritated tissue can rub against the femur or the back of the kneecap and cause pain, catching or a snapping sensation when you bend and straighten your knee.^1,2

Plicae are normal folds in the joint lining. Most people never know they have them. However, repetitive loading, a spike in training volume, or a direct knock to the knee can inflame the plica and turn it into a painful problem. The medial plica is the most common source of symptoms.

Where Is the Medial Plica?

The medial plica runs along the inner front part of your knee. It sits near the medial femoral condyle and the underside of the patella. When it becomes thickened and tight, it can flick or bowstring across the bone as you bend and straighten your knee. This movement is often what produces clicking or a catching feeling.

What Causes Plica Syndrome?

Plica irritation commonly follows repetitive activities that load the front of the knee. Examples include running, jumping sports, cycling, hill walking, repeated squatting, or kneeling. A sudden increase in training load, a change in surfaces, or poor recovery between sessions can all contribute.^1,2,8

Other factors that may increase your risk include:

• Patellar tracking problems or patella maltracking
• Weak hip and quadriceps muscles
• Tight hamstrings or quadriceps
• Previous knee trauma or surgery
• Jobs or sports that involve frequent kneeling, squatting or stairs

Plica syndrome often co-exists with other anterior knee conditions such as patellofemoral pain, chondromalacia patella or patellar tendinopathy. That is why a careful assessment is important rather than assuming the plica is the only problem.

Symptoms of Plica Syndrome

The most common symptom is dull or sharp pain at the front or inner side of the knee. Many people describe a band-like discomfort or a sensation of something catching inside the joint. Pain usually worsens with activities that load the patellofemoral joint or involve repeated bending.

Typical aggravating activities include:

• Walking up or down stairs or hills
• Squatting, lunging or kneeling
• Getting up from a low chair
• Running, especially on slopes or uneven ground
• Sitting for long periods with the knee bent

Clicking, popping or a snapping sensation at the inner front of the knee is common. Some people feel a thick band that is tender to touch. Swelling may appear after heavier activity. In long-standing cases the quadriceps muscles can weaken, which further stresses the joint.^1,2

How Is Plica Syndrome Diagnosed?

Your physiotherapist or sports doctor will take a detailed history and examine your knee. They will look for tenderness over the medial plica, a palpable band that rolls under their fingers, and reproduction of your pain with specific bending and straightening tests. They will also screen the hip, foot and ankle because these can influence knee load.

Plica syndrome is largely a clinical diagnosis. X-rays do not show plicae but can rule out arthritis or fractures. MRI or ultrasound may demonstrate a thickened, inflamed plica, yet these scans are mainly used to exclude other problems such as meniscal tears or cartilage damage.^1,2,16 A good clinical examination remains the most useful starting point.

Plica Syndrome Treatment Options

Most people respond well to conservative treatment. Recent reviews suggest that structured physiotherapy and arthroscopic surgery can both improve pain and function, and that a conservative-first approach is appropriate for most patients.^2,4,7

Early Pain Relief and Load Management

Initially, the goal is to calm irritation. Your clinician may recommend:

• Relative rest and activity modification, not complete immobilisation
• Short-term use of ice or heat, depending on your comfort
• Simple pain relief or anti-inflammatory medication if advised by your doctor
• Temporary changes to running distance, speed, hills or surfaces

Physiotherapy for Plica Syndrome

Physiotherapy addresses the reasons your plica became irritated in the first place. A typical program may include:

• Quadriceps and hip strengthening to improve knee control
• Hamstring and quadriceps stretching where needed
• Patellar taping or a patellofemoral knee brace to reduce local stress
• Manual therapy to improve joint and soft tissue mobility
• Balance, proprioception and agility drills
• Running or walking retraining for active people

In many series, a well-structured rehabilitation program settles symptoms in most patients and allows them to return to sport or normal activity without surgery.^2,4,12 Adherence to your home program is a key factor in success.

Injections and Other Medical Options

In some cases, your doctor may consider an ultrasound-guided corticosteroid injection around the plica. This can reduce inflammation and help confirm the diagnosis, although evidence remains limited and it is not required for most people.^15,20,25 Your physiotherapist and doctor can discuss whether this option is suitable for you.

When Is Surgery Considered?

Arthroscopic surgery is usually reserved for people whose symptoms persist after several months of well-performed conservative care. The surgeon removes or releases the symptomatic plica and checks for any associated cartilage damage.

Modern studies report good outcomes for most patients following arthroscopic medial plica resection, especially when other significant knee pathology is absent.^10,11,19 However, results are not perfect and careful selection is important, which is another reason to trial a full rehabilitation program first.

Can You Prevent Plica Syndrome?

You may not be able to prevent every case, but you can reduce your risk by:

• Progressing training loads gradually rather than in sudden spikes
• Keeping good hip and knee strength with regular knee exercises
• Maintaining flexibility in your quadriceps, hamstrings and calves
• Using appropriate footwear for your sport or workplace
• Managing body weight to ease stress on the lower limb joints

Managing other knee issues such as patella maltracking or patellofemoral pain early can also reduce ongoing irritation to the medial plica.

When Should You See a Physiotherapist or Doctor?

Book an assessment if:

• Knee pain lasts longer than a few weeks
• You feel catching, clicking or a band-like sensation at the inner front of the knee
• Pain limits your walking, stairs, work or exercise
• You have already tried rest and simple measures without improvement

Seek urgent medical review if you have a large traumatic injury, a locked knee, marked swelling, or cannot bear weight. These features may suggest a different knee problem that needs prompt attention.

A physiotherapist who regularly manages knee conditions can diagnose plica syndrome, guide conservative care, and liaise with your GP or knee surgeon if imaging or surgical opinion is appropriate.

People Also Ask: Plica Syndrome

Is plica syndrome serious?

Plica syndrome is rarely dangerous, but it can be very limiting if it stops you walking, climbing stairs, working, or playing sport. Early assessment and physiotherapy usually control symptoms and help protect the cartilage under your kneecap.

Does plica syndrome go away?

Mild plica irritation can settle with activity changes and simple exercises. More persistent cases usually improve when you follow a structured strengthening and movement program over several weeks. A small group of people may still need arthroscopic surgery if symptoms fail to resolve.

What is the best treatment for plica syndrome?

The best first-line treatment is usually physiotherapy that targets strength, flexibility and movement patterns, along with short-term load modification. Surgery is generally reserved for people who remain symptomatic after a good trial of conservative management.

Can I keep running with plica syndrome?

Some runners can continue with a modified program if pain remains mild and settles quickly after training. Your physiotherapist can guide safe distances, surfaces and strength work so you protect the knee while you recover.

References

1. Casadei K. Plica Syndrome. StatPearls. Treasure Island (FL): StatPearls Publishing; 2024.
   Available from: https://www.ncbi.nlm.nih.gov/books/NBK535362/
   
2. Gryckiewicz S, et al. The medial plica syndrome of the knee – narrative review of diagnosis and treatment.
   J Orthop. 2025;36:123–131.
   Available from: https://www.sciencedirect.com/science/article/pii/S2214854X25000056
   
3. Franco P, et al. Surgical and conservative management of medial plica syndrome: a systematic review and meta-analysis of functional outcomes.
   Curr Rev Musculoskelet Med. 2025;18(2):101–112.
   Available from: https://pubmed.ncbi.nlm.nih.gov/41189766/
   
4. Paczesny L, et al. A 10-year follow-up on arthroscopic medial plica resection in the knee.
   Sports Health. 2021;13(3):251–258.
   Available from: https://pubmed.ncbi.nlm.nih.gov/31810387/
   
5. Lee PYF, et al. Synovial plica syndrome of the knee: a commonly overlooked cause of anterior knee pain.
   Clin Orthop Surg. 2017;9(2):177–185.
   Available from: https://pubmed.ncbi.nlm.nih.gov/28825013/