The pain of arthritis can be debilitating and for many people that pain hits them in their knees and literally knocks them off their feet!! But when people have what health professionals call "end stage arthritis" in the knees-getting knee replacement surgery can have a powerful impact on their quality of life. In this program we speak to world-renown experts on knee replacement surgery to see how new procedures can make a real difference. We also speak to patients who have had knee replacement surgery and see how their lives changed after they had it done.