A plica is a fold in the lining of the joint (joint capsule). It’s not known why they exist, but they are normal and are considered a remnant embryological structure. There are four in total: medial patella; lateral patella; infrapatella, and suprapatella. The most problematic is the medial patella plica.

There are four classifications of medial plica. Although its appearance can vary with these four different classifications, it may be felt as a tender mild ridge which runs from the inside of the knee to the knee cap.

Plica irritation is often a diagnosis of exclusion and is made via MRI scan or arthroscopy. The cause of irritation is unclear, although poor biomechanics, a direct blow or overuse is thought to trigger the irritation.

(The list of conditions given above and subsequent explanations are intended as a general guide and should not be considered a replacement for a full medical examination. Furthermore, we do not purport to treat all the conditions listed. Should you wish to discuss any of these conditions with our chiropractors, please do not hesitate to phone the clinic on 020 7374 2272 or email

Our team of chiropractors and massage therapists are on hand to answer any questions you may have, so get in touch today via or on +44 (0)20 7374 2272.

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