What is Plica Syndrome?
Plica syndrome is often characterized by anterior knee pain, commonly found along the superomedial aspect of the knee. The plica is considered to be a structure in the knee lacking significant function or importance. Four plicae synovial folds are found in the knee, but only one causes pain or discomfort. This structure is called the medial plica. The medial plica attaches to the lower end of the patella (kneecap) and runs sideways to attach to the lower end of the thighbone at the side of the knee joint closest to the other knee.
A plica causes problems when it is irritated. This can occur over a long period of time, when the plica is irritated by certain exercises, repetitive motions, or kneeling. Activities that repeatedly bend and straighten the knee, such as running, biking, or use of a stair-climbing machine, can irritate the medial plica and cause plica syndrome.