Plica Syndrome: Causes, Symptoms & Treatment
Plica syndrome is an irritation of the synovial fold inside the knee joint. It causes pain, swelling, and snapping sensations and is common in physically active individuals.
Things worth knowing about "Plica Syndrome"
Plica syndrome is an irritation of the synovial fold inside the knee joint. It causes pain, swelling, and snapping sensations and is common in physically active individuals.
What is Plica Syndrome?
Plica syndrome refers to the irritation or inflammation of the synovial plica – a fold of the synovial membrane inside the knee joint. This fold is an embryological remnant from fetal development, when the knee joint was divided into separate compartments. While it typically reabsorbs before birth, it persists in approximately 50 % of the population in varying forms. When irritated by overuse or injury, it can become thickened and inflamed, leading to pain and dysfunction.
Causes
Plica syndrome is most commonly caused by repetitive mechanical stress or direct trauma to the knee. Common triggering factors include:
- Repetitive sports activities such as running, cycling, or squatting
- Direct trauma or impact to the knee
- A sudden increase in training intensity or volume
- Weakness or muscular imbalances of the thigh muscles
- Anatomical variations in the structure of the knee joint
Symptoms
The symptoms of plica syndrome can closely resemble those of other knee conditions, making diagnosis challenging. Common symptoms include:
- Pain along the inner side of the knee, often around the kneecap (patella)
- Snapping or clicking sensations during bending and straightening of the knee
- Swelling and tenderness in the affected area
- Stiffness of the knee joint, particularly after prolonged sitting
- Increased pain when climbing stairs, squatting, or during physical activity
Diagnosis
Diagnosis of plica syndrome is primarily clinical, based on a thorough physical examination. The physician assesses pain location and may perform the plica test, in which the patella is pressed medially with the knee slightly flexed. Additional diagnostic tools include:
- MRI (Magnetic Resonance Imaging): To visualize the plica and rule out other knee pathologies
- Ultrasound: May reveal a thickened or inflamed plica
- Arthroscopy: Considered the gold standard for direct visualization and simultaneous treatment of the plica
Treatment
Conservative Treatment
Most cases of plica syndrome can be successfully managed without surgery. Conservative treatment options include:
- Rest and activity modification: Avoiding painful movements and reducing overload
- Physical therapy: Strengthening exercises for the quadriceps and surrounding muscles, along with stretching and stabilization training
- Anti-inflammatory medications (NSAIDs): Such as ibuprofen or diclofenac to relieve pain and inflammation
- Ice application: To reduce swelling and discomfort
- Corticosteroid injections: A local injection into the knee joint may provide relief in persistent cases
Surgical Treatment
If conservative measures fail to provide sufficient improvement after several weeks to months, arthroscopic resection of the plica may be recommended. This minimally invasive procedure typically carries a good prognosis and high success rate.
Prognosis
With early treatment and consistent rehabilitation, most patients recover fully. Recurrence can be prevented through targeted muscle training, proper warm-up routines before physical activity, and avoiding excessive overload of the knee joint.
References
- Sznajderman T, Smorgick Y, Lindner D, et al. - Medial plica syndrome. Isr Med Assoc J. 2009;11(1):54-57.
- Schindler OS - The surgical treatment of symptomatic medial plica of the knee. J Bone Joint Surg Br. 2009;91(8):1022-1028. DOI: 10.1302/0301-620X.91B8.22018
- Lyu SR - Relationship of medial plica and medial femoral condyle during flexion. Clin Biomech. 1999;14(7):489-493.
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