Sit on the ground, couch or mattress, using your legs stretched straight out in front of you. Set a rolled-up towel less than 1 knee. Push down to the towel like straightening your knee. Lubricant/Gel Injection Hyaluronic acid injections might reduce the pain by providing some cushioning on your knee. https://www.theorthopaedicandpainpractice.com/treatment-for-swollen-arthritic-knee/