Joint as a result of aging and the deterioration of articular cartilage. Furthermore, there is emerging evidence that abnormal anatomy may contribute to early development of osteoarthritis. Other forms of arthritis are rheumatoid arthritis and psoriatic arthritis, which are autoimmune diseases in which the body is attacking itself. Septic arthritis is caused by joint infection. Gouty arthritis is caused by deposition of uric acid crystals in the joint that results in subsequent inflammation. Additionally, there is a less common form of gout that is caused by the formation of rhomboidal-shaped crystals of calcium pyrophosphate. This form of gout is known as
Septic arthritis maximal in this position. In peri-articular arthritis, pain only occurs when the joint is moved, and the lesion usually lies in one specific area around the joint. The most common joint affected is the knee. Hip, shoulder, wrist, and elbow joints are less commonly affected. Spine, sternoclavicular, and sacroiliac joints can also be involved. The most common cause of arthritis in these joints is intravenous drug use. Usually only one joint is affected. More than one joint can be involved if bacteria are spread through the bloodstream. For those with artificial joint implants, there is a chance of 0.86 to