Does plica syndrome cause knee locking?

Irritated plica tissue can cause a catching or brief sticking feeling as the knee bends and straightens. People may describe this as locking, particularly around the front or inner knee. A true locked knee cannot fully straighten or bend and may remain restricted. That distinction matters because meniscus, cartilage, ligament, or joint problems can also limit movement. Pain, swelling, giving way, a recent twist, and the exact position of the knee help a clinician work out what is happening.

Do not forcefully jerk or twist a knee that catches. Rest from movements that repeatedly trigger the episode, such as deep squats, kneeling, or pivoting, while keeping gentle motion within comfort. Use support when walking if the knee feels unreliable and arrange an examination. A physiotherapist may work on swelling control, range of motion, and strength after more urgent causes have been considered.

Seek prompt medical care if the knee is truly stuck, you cannot bear weight, or locking followed a twist or direct impact. Rapid swelling, marked pain, deformity, repeated giving way, fever, redness, warmth, numbness, or a cold or discoloured foot also need timely assessment. Do not assume every episode of restricted movement is caused by plica syndrome.

Ask whether your knee is catching or truly locked, what examination findings distinguish those patterns, and whether imaging is appropriate. Ask how much weight to place on the leg, which movements to avoid, and which symptoms should bring you back urgently.