Knee Braces What causes OA? How does a knee brace help? - Valgus / Varus Knock Knee BraceMay 02, 2016 What causes OA? There are tissues in a healthy knee joint that form a natural cushion between the tibia (shin bone) and femur (thigh bone). With ev... Join Us A short sentence describing what someone will receive by subscribing Your email Subscribe100% free, Unsubscribe any time! Follow us