I haven't had knee replacement surgery, but my brother did and also a close friend. Rehab was very beneficial to their recovery. Without a therapist to show them the proper exercises necessary to get full movement, the surgery would have been useless. You need to work the muscles, tendons and ligaments so your knee doesn't lock up. I will keep you in my thoughts and prayers for a successful surgery and speedy, full recovery 🙏 ♥️