Arthritis of the Knee: An Overview
Introduction: Anatomy of the Knee The knee joint is a structure composed of three bones: the femur (thigh bone), the tibia (shin bone) and the patella (knee cap). The bones are covered with smooth cartilage surfaces that act as a cushion during weight-bearing activity. The bones of the knee are connected by strong ligaments and powerful muscles that are attached to the thigh and calf by tendons and provide side-to-side stability. In a healthy knee, all of these structures work together to allow the knee to flex (bend) and extend (straighten) the lower leg smoothly. Arthritis is a disease that affects the surface of the joint (cartilage) wearing down so it no longer moves smoothly and loses the ability to acts like a cushion. Damaged cartilage causes a roughened surface and may lead to bones rubbing directly together, causing persistent pain, clicking, a catching sensation, and limited range of motion. Knee Arthritis There are three common types of arthritis: Oste...