Generally people think that knee joint replacement is to replace the whole joint. Knee joint replacement is a treatment method to remove the joint surface that the body cannot repair by itself, replace the damaged joint with artificial joint parts, correct the deformed line of force of the body, eliminate the knee pain, maintain the stability of the joint, and restore the function of the knee joint, instead of replacing the whole joint. Various reasons lead to changes in the joint structure, simple drug treatment can partially relieve pain symptoms, can not change the joint structure changes, and artificial joint replacement role is to relieve pain, stabilize the joint, correct deformities, such as O-leg, X-shaped leg, improve joint function, so that the stiff, restricted joints can be moved, the function of the joint is greatly improved. Artificial knee joint replacement is to remove the worn and damaged joint surfaces and replace them with artificial joint surfaces, like installing braces on bad teeth, without replacing the whole joint, so patients should not have too much burden and thoughts.