Arthritis
Arthritis is an often painful inflammation of the joint between two bones. The most common type of arthritis, osteoarthritis, occurs when the protective lining in the joint becomes worn away due to age, overuse, or trauma. Without this protective lining, movement causes the joint to swell and become painful and stiff. This type of arthritis often occurs in weight-bearing joints, such as hips and knees.
Another type of arthritis, rheumatoid arthritis, occurs when the body’s immune system begins to produce substances that attack the body. These substances destroy the joint surface, and the joint lining swells, invading surrounding tissues. Swelling, pain, and stiffness develop, even when the joint is not used.
X-rays and blood tests are used to diagnose arthritis, but initial symptoms include joints that are weak, tender, or limited in movement, pain when pressure is placed on a joint, and a grating sound or feeling when the joint is moved. Treatment can include over-the-counter and prescription drugs, exercise and therapy, and in some cases, surgery to remove joint linings, realign the joint, or replace the entire joint.
For more more in-depth information, please visit the American Academy of Orthopaedic Surgeons web site.