Even if you’re able to return to full normal after your surgery, you’ll need to mind your artificial knee for the rest of your life. Avoid lifting anything more than 20 pounds. That can stress the joint too much. Don’t jerk the leg with the implant. Turn by taking small steps. Pivoting sharply -- your toes pointed in one direction and your thigh and upper body in another -- can damage the implant and wear it out sooner.