Slick cartilage allows the ends of the bones in a healthy knee to move smoothly against each other. Osteoarthritis damages and wears away the cartilage — creating a rough surface.

When the cartilage wears away unevenly, it narrows the space between the femur and tibia, resulting in a bow inward or outward depending on which side of the knee is affected. Removing or adding a wedge of bone in your upper shinbone or lower thighbone can help straighten this bowing, shift your weight to the undamaged part of your knee joint and prolong the life span of the knee joint.

Jul. 26, 2014