Your joints are involved in almost every activity you do. Simple movements such as walking, bending, and turning require the use of your hip and knee joints. Normally, all parts of these joints work together and the joint moves easily and without pain. But when the joint becomes diseased or injured, the resulting pain can severely limit your ability to move and work.
Understanding the Causes of Joint Pain
What is a joint ?
A joint is formed by the ends of 2 or more bones that are connected by thick bands of tissue called ligaments. For example, the knee joint is formed by the lower leg bone, called the tibia or shinbone, and the thighbone, called the femur. The hip joint is a ball-and-socket joint, formed by the ball, or femoral head, at the upper end of the thighbone, and the rounded socket, or acetabulum, in the pelvis.
The ends of the bone in a joint are covered with a smooth, soft material called cartilage. Normal cartilage allows nearly friction-less movement. The rest of the surfaces of the joint are covered by a thin, smooth tissue lining called the synovium. The synovium produces fluid that acts as a lubricant to reduce friction and wear in the joint.
Common Causes of Joint Pain
One of the most common causes of joint pain is arthritis. The most common types of arthritis are: