Knee Replacement – Know Exercises After It! Disorders that affect the knee like severe arthritis or trauma do not allow you to utilize the full range of motion of your knees. Since you use your affected knees very sparsely, they become stiff and this condition persists even after you have undergone a knee replacement surgery. You can, however, get back the normal range of motion of a healthy knee by doing the following exercises post knee replacement surgery. Take a stroll around the house after surgery : Walking helps your knees get back to normalcy. Initially, you need to walk using the support of crutches or canes as instructed by your therapist. Make sure that your heels and toes are perfectly aligned while you walk. Walk for 20 minutes at least twice at the initial stage and increase your pace gradually, so that, eventually you can walk freely without any support.