The knee will not bend as far as it did before you developed knee problems, but the
surgery will allow you to stand and walk for longer periods without pain.
After surgery, you may be allowed to resume activities such as golfing, riding a bike, swimming, walking for exercise, dancing etc. Keeping in view the restriction on bending the knees, you may not extremely bend the knee but may learn to discover a new position on the top but with less bending of affected knee. That will help.