Our expert says:
She probably has a sinovitis, an inflammation of the lining of the knee joint - the sinovium makes excess fluid as a result of the inflammation ( called an effusion) - this can be due to an injury, gout, auto-immune arthritis and a host of other infections. I am sure her doctor will work through the list to try and identify the cause.
Is she wearing a Robert Jones dressing? (A Robert Jones dressing is a crepe bandage and orthopedic cottonwool put on in a certain way to keep the knee still without immobilizing it totally, as this could cause stiffness of the joint)This usually helps for the pain and swelling.
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