I recently had to have knee surgery after taking a fall at work. I was going through physical therapy and having lots of pain. Then, my doctor prescribed the joint active system product. This is one of the best things that I have ever seen and used. It has allowed me to stretch my leg myself with only a fraction of the pain of physical therapy. This product allows the patient to be able to stretch at their own pace and to avoid a lot of the pain that someone else can induce on you to try to get the same result.