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Medial Plica Syndrome: Causes & Treatment

Medial plica syndrome is an irritation of the inner synovial fold of the knee, causing pain, swelling, and reduced mobility in the knee joint.

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Things worth knowing about "Medial plica syndrome"

Medial plica syndrome is an irritation of the inner synovial fold of the knee, causing pain, swelling, and reduced mobility in the knee joint.

What is Medial Plica Syndrome?

Medial plica syndrome is a condition of the knee joint in which a natural fold of the synovial membrane – known as the medial plica or plica mediopatellaris – becomes chronically irritated or inflamed. The plica is a remnant of embryonic connective tissue that once divided the knee joint during early development. In most people it remains asymptomatic, but in some individuals it can become thickened and painful due to overuse or injury.

Causes

The syndrome typically arises from mechanical irritation of the plica, triggered by the following factors:

Overuse from repetitive movements such as running, cycling, or squatting
Sports injuries or direct trauma to the knee
Anatomical variations that make the plica more susceptible to friction against the femoral condyle
Inflammatory conditions of the knee such as synovitis
Sudden increases in training intensity without adequate preparation

Symptoms

Common symptoms of medial plica syndrome include:

Pain along the inner aspect of the kneecap, often described as dull or sharp
Snapping or clicking of the knee during movement (so-called snapping phenomenon)
Swelling around the medial border of the patella
Stiffness of the knee joint, particularly after prolonged sitting
Increased pain when climbing stairs, performing squats, or after physical activity

Diagnosis

Diagnosis is primarily clinical. The physician takes a thorough medical history and performs a physical examination of the knee joint.

Clinical Tests

A characteristic finding is the plica test, in which the examiner manually compresses the plica to reproduce pain. Additional imaging studies may include:

MRI (Magnetic Resonance Imaging): Best method for visualising a thickened or inflamed plica
Ultrasound: Can demonstrate thickening of the synovial fold
X-ray: Used to exclude bony causes of knee pain
Arthroscopy: The gold standard for direct visualisation and simultaneous treatment

Treatment

Conservative Treatment

In most cases, medial plica syndrome can be managed without surgery. Conservative measures include:

Rest and activity modification of the affected knee
Physiotherapy to strengthen the quadriceps muscle and stabilise the knee joint
Anti-inflammatory medications (NSAIDs such as ibuprofen) for pain relief
Ice application and compression bandages during acute episodes
Corticosteroid injections into the joint for persistent inflammation

Surgical Treatment

If conservative treatment fails to provide adequate relief after three to six months, arthroscopic resection of the plica may be considered. The inflamed fold is removed using minimally invasive techniques. Outcomes are generally excellent, and most patients can return to full sporting activity after a rehabilitation period.

Prognosis and Prevention

The prognosis of medial plica syndrome is good when diagnosed and treated promptly. Prevention includes adequate warm-up before exercise, gradual increases in training load, and strengthening of the muscles surrounding the knee joint.

References

Lyu SR. - Relationship of medial plica and medial femoral condyle during flexion: an arthroscopic assessment in patients with medial knee pain. In: Arthroscopy, 2007;23(11):1196-1201. PubMed.
Kim SJ, Choe WS. - Arthroscopic findings of the synovial plicae of the knee. In: Arthroscopy, 1997;13(1):33-41. PubMed.
Dupont JY. - Synovial plicae of the knee: controversies and review. In: Clinics in Sports Medicine, 1997;16(1):87-122. PubMed.

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