Common Knee Injuries and Problems - Arthritis

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Other Rheumatic Diseases.
Arthritis
Rheumatoid Arthritis
Rheumatoid arthritis, which generally affects people at a younger age than osteoarthritis, is an autoimmune disease. This means it occurs as a result of the immune system attacking components of the body. In rheumatoid arthritis, the primary site of the immune system’s attack is the synovium, the membrane that lines the joint. This attack causes inflammation of the joint. It can lead to destruction of the cartilage and bone and, in some cases, muscles, tendons, and ligaments as well.
Osteoarthritis
Most people with knee problems have a form of arthritis called osteoarthritis. In this disease, the cartilage gradually wears away and changes occur in the adjacent bone. Osteoarthritis may be caused by joint injury or being overweight. It is associated with aging and most typically begins in people age 50 years or older. A young person who develops osteoarthritis typically has had an injury to the knee or may have an inherited form of the disease.
Infectious Arthritis
a term describing forms of arthritis that are caused by infectious agents, such as bacteria or viruses. Prompt medical attention is essential to treat the infection and minimize damage to joints, particularly if fever is present.
Psoriatic Arthritis
a condition in which inflamed joints produce symptoms of arthritis for patients who have or will develop psoriasis
Ankylosing Spondylitis
an inflammatory form of arthritis that primarily affects the spine, leading to stiffening and in some cases fusing into a stooped position
Lupus
an autoimmune disease characterized by destructive inflammation of the skin, internal organs, and other body systems as well as the joints
Gout
an acute and intensely painful form of arthritis that occurs when crystals of the bodily waste product uric acid are deposited in the joints
Source: U.S. Department of Health and Human Services, National Institutes of Health,
National Institute of Arthritis and Musculoskeletal and Skin Diseases. www.niams.nih.gov
Common Knee Injuries and Problems: Arthritis