The knee is the largest joint in the human body and one of the most complex. It allows you to walk and run, execute a variety of different body positions, and change the direction of your body movement. However, the knee also serves as an important focal point for weight-bearing. It is subjected to tremendous forces — approximately 4 times the body’s weight during walking and about 8 times the body’s weight when running. This, combined with the unique structure of the knee joint, makes knee problems the number one reason people seek the attention of an orthopedic specialist. An estimated 4 million people seek treatment for knee injuries and pain each year.