Along with going to supervised PT, a person also needs to faithfully do prescribed knee bending and strength exercises at least twice a day at home, stretching to the edge of pain. It's boring and uncomfortable, but it's easier to gain range in the 2-4 weeks right after surgery before the healing process "sets up" your muscles. Expected swelling after surgery is usually the main reason you can't bend as well as you should early on, so lots of raised leg icing is needed to help reduce the swelling so you can bend your leg to it's possible range.

Find a way to incorporate a deep knee bend many times into your daily routine around the house. If you use stairs in your house, every time you go up, put your TKR foot up a couple of steps and lower your chest over your knee with the goal of trying to touch your knee to the next step up. Hold for about 30 seconds. If you don't have stairs, do a deep bend on a chair, stool or sofa. The more times a day you can force a deeper bend, the more likely you are to be able to gain range.