Plica Syndrome

Author: Mr Oliver Eaton BSc (Hons), PG.Cert – Orthopaedic Specialist
Reviewed by: Mr William Sharples BSc (Hons) – Pain Management Expert
Last Updated: September 2025

Table of Contents

• What Is A Plica?
• Medial Plica Syndrome
• Signs And Symptoms
• Differential Diagnosis
• Causes
• Diagnosis
• Treatment
• Prolotherapy
• Surgery & Recovery
• Case Studies
• FAQ
• Clinic & Contact
• Author Bio
• References

In this article, you will find out everything you need to know about Plica syndrome and the most effective ways to treat it, including an advanced treatment called Prolotherapy.

Knee pain can have a lot of negative consequences on your daily activity. On your regular, healthy days, you may not notice how important knees are in sitting, standing, and running. However, it is during the disorders that you come to know of the importance of knee structures.

Most of you consider the knee joint a sturdy, hard structure donning a cap. Undoubtedly, the knee cap is a prominent feature of your leg anatomy, but there are numerous soft tissues as well that perform multiple functions. One such soft tissue present within the knee is plica.

What Is A Plica?

The knee joint (like all synovial joints) is surrounded by a synovial membrane. A synovial membrane is a fluid-filled capsule that helps minimize friction of the bones. Plica refers to the membranous fold inside the knee joint provided by mother nature to protect it. Plicae of the knee surround the joint.

The embryonic life of a human is characterized by these synovial folds. In some cases, the plicae are absorbed before birth. However, in a lot of cases, doctors have found remnants of the synovial plicae.

There are different types of plicae present in the knee:

• Suprapatellar plica
• Medial patella plica (medial parapatellar plica)
• Infrapatellar plica
• Lateral plica (lateral para patellar plica)

Medial Plica Syndrome: Outcome Of Medial Plica Irritation

Irritation and inflammation of the synovial plicae of the knee lead to synovial plica syndrome. According to reports, synovial plica syndrome has a prevalence ranging from 3% to 30%, with anterior knee pain being the most common presentation. It is the most commonly overlooked cause of knee pain in adults.

Of all the plicae, the medical plica is most prone to getting affected by injury and irritation. Researchers call medial plica “the sneaky plica” because of its tendency to sneak into a painful disorder. Research shows that the high pressure between the medial femoral condyle and the medial plica increases its tendency to plica syndrome.

You may also get inflammation of the lateral plica and, therefore, lateral plica syndrome. This condition is also known as plica synovialis lateralis. The type of plica syndrome depends on the type of plica tissue involved. So. you may fall prey to plica synovialis infrapatellaris or plica synovialis mediopatellaris.

Signs And Symptoms Of Plica Syndrome

The most commonly observed symptoms of plica syndrome are:

Anterior Knee Pain

Patients experience a dull ache in the anterior knee, worsened by bending and straightening. Studies show anterior knee pain is frequently associated with plica syndrome and can overlap with other conditions like iliac crest pain.

Clicking Sounds

Knee bending may produce cracking or clicking sounds due to inflamed plica.

Grinding/Catching Sensations

Patients often feel grinding or catching, especially when standing after prolonged sitting.

Swelling And Inflammation

Progression causes swelling of the plica, worsening symptoms. Localized swelling leads to clicking and grinding sensations. Research shows inflammation is a key contributor.

Instability Of The Knee Joint

Many patients report the patellofemoral joint gives way. Arthroscopy confirms pathological plicae contribute to knee instability.

Differential Diagnosis

Torn Meniscus Vs. Plica Syndrome

A torn meniscus has similar symptoms to plica syndrome. It is caused by twisting injuries and is a C-shaped cartilage tissue.

Tendonitis Vs. Plica Syndrome

Patellar tendonitis may mimic plica syndrome; overuse or abnormal forces often trigger it.

Bone Injury Vs. Plica Syndrome

Fractures or bone disruptions must be ruled out before diagnosis.

Causes Of Medial Plica Syndrome

Main causes include overuse, repeated knee flexion/extension, and injuries. Activities like biking, climbing, and running contribute. Sports injuries can also trigger inflammation.

How To Diagnose Plica Syndrome?

Physical exam is key. Doctors may perform the plica stutter test (Mital-Hayden test). X-rays or MRI scans can visualize the plica and rule out other pathologies.

Treatment

Medications

Painkillers like acetaminophen, ibuprofen, or naproxen reduce pain and inflammation.

Physical Therapy

Physical therapy combined with corticosteroid injections effectively treats various plicae. Conservative strategies are first-line; surgery is only for non-responders.

Steroid Injections

Corticosteroids reduce localized swelling, especially when paired with physical therapy.

Prolotherapy

Prolotherapy is clinically proven for treating Plica Syndrome by regenerating collagen cells, addressing root causes, and preventing symptom recurrence.

Disclaimer: The information provided in this section is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Prolotherapy may not be suitable for everyone, and outcomes can vary. Always seek the guidance of a qualified healthcare professional regarding your specific medical condition or treatment options. Never disregard professional medical advice or delay seeking it because of information you have read here.

Stretching And Exercises

Strengthening quadriceps and hamstrings, combined with knee-specific exercises, alleviates pain and prevents recurrence.

Medial Synovial Plica Resection (Surgery)

Arthroscopic surgery is indicated when conservative treatments fail. Studies confirm long-term improvement post-resection.

How Can I Recover Quickly From Plica Syndrome Surgery?

Recovery depends on overall health, comorbidities, diet, and adherence to rest and rehab protocols. Dominant knees take longer to heal.

Case Studies

Case Study 1: A 28-year-old runner developed medial plica syndrome. Conservative therapy, including physical therapy and corticosteroid injections, resolved symptoms in 8 weeks.

Case Study 2: A 35-year-old office worker with lateral plica syndrome required arthroscopic resection after 6 months of unsuccessful conservative therapy, achieving full recovery within 3 months.

Frequently Asked Questions

1. What does plica syndrome feel like? Knee pain, grinding, clicking, and occasional instability.
2. How do you treat plica syndrome? Physical therapy, medications, corticosteroid injections, and prolotherapy. Surgery is reserved for persistent cases.
3. Does plica syndrome go away? Only with appropriate treatment; it rarely resolves spontaneously.
4. How do you test for Plica syndrome? Plica stutter test, X-rays, and MRI scans help confirm diagnosis.
5. Does Plica show up on MRI? Yes, swelling or inflammation of the plica can be seen.

Contact ProHealth Clinic Today for Your FREE 15-Minute Discovery Call

Don’t let Plica Syndrome control your life any longer. Join the thousands of patients who have found lasting relief through prolotherapy at ProHealth Clinic.

Get in Touch
Phone: +441234380345
Email: info@prohealthclinic.co.uk

Our Clinic Locations:
London: 104 Harley Street, Marylebone, W1G 7JD
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All clinics offer the same award-winning prolotherapy treatment with convenient appointment times, including evenings and weekends.

Author Bio

Having performed over 10,000 procedures, Mr Eaton is one of the UK’s leading practitioners in the field of treating Plica Syndrome, with patients travelling to see him from across the UK, Europe, and the Middle East.

With over 12 years of clinical experience, Oliver is dedicated to helping patients understand their symptoms associated with Plica Syndrome and providing effective treatment options to alleviate them.

He qualified in Prolozone Therapy and Prolotherapy in America with the American Academy of Ozonotherapy. He continued on to complete further qualifications at the Royal Society of Medicine, Charing Cross Hospital in London, Keele University’s Anatomy & Surgical Training Centre, and the medical department of Heidelberg University in Germany.

Over the years he has had the privilege of treating many elite-level athletes, including both Olympic and Commonwealth medallists.

Mr Eaton’s expertise has been featured in many national news and media publications, including The Telegraph, The Daily Mail, The Daily Express, Women’s Health Magazine, and The Scotsman.

LinkedIn profile: https://www.linkedin.com/in/oliver-eaton-4338225b/

References

1. NCBI Bookshelf. Different types of plicae in the knee.
2. PubMed. Synovial plica syndrome prevalence study.
3. PubMed. Medial plica research.
4. PubMed. High-pressure effects on medial plica.
5. NCBI PMC. Plica syndrome investigation advice.
6. Springer. Infrapatellar plica potential cause of pain.
7. Thieme. Anterior knee pain in mediopatellar plicae.

Disclaimer: This article is for informational purposes only and does not substitute for professional medical advice. Always consult your healthcare provider before making treatment decisions.