This is a device for immobilizing the knee joint. I purchased it at the hospital after suffering a ligament injury. I used it for two months, from October to December of last year. I used it on my left leg, but I think it can be used on either leg. It's a used item, so it shows signs of wear, but it's still usable. The adhesive tape is strong and provides a secure hold. There are three rigid support plates on the back of the knee and on both sides, which hold the knee in a slightly bent position.