A study conducted by the Touch Research Institute at the University of Miami showed a significant improvement in knee function in women who got massage for 6 weeks. They reported 3 months later that they still felt better too. Maybe they continued with self massage after the study ended.
If you have any ligament or tendon damage, I suggest adding some lemongrass, wintergreen, and marjoram essential oils to your massage too. AromaTouch smells better than those oils and has marjoram, cypress, and peppermint in it too. If you can only afford one oil, I'd get this one. If you are looking to really target your knee injury or the arthritis from it, read the testimonial in this link. There's an easy recipe for an essential oil blend to induce healing. You can get all of the oils in my DoTERRA shop. Find the link at the top of the page!