n. aspiration (removal) of fluid from a joint through a puncture needle into a syringe.
n. inflammation of one or more joints, characterized by pain, swelling, warmth, redness of the overlying skin, and diminished range of joint motion. There are four basic subgroups of arthritis: noninflammatory arthritis, including *osteoarthritis, *neuropathic arthritis, and *osteochondritis dissecans; inflammatory arthritis, including *rheumatoid arthritis, *gout, *psoriatic arthritis, and *juvenile idiopathic arthritis; infectious arthritis, including *septic arthritis; and haemorrhagic arthritis, including haemophilic arthritis (which occurs in patients with haemophilia). Arthritis may be monoarticular (involving one joint), pauciarticular (involving four or fewer joints), or polyarticular (involving five or more joints, either simultaneously or in sequence). Diagnosis is based on clinical and laboratory findings, including X-rays, blood tests, and where necessary analysis of synovial fluid obtained by *arthrocentesis. Treatment is specific for each subgroup and may include any combination of supportive measures with activity modification, analgesics, anti-inflammatory medications (e.g. *NSAIDs), *disease-modifying antirheumatic drugs (DMARDs), corticosteroids, and surgical procedures, such as joint replacement (see arthroplasty). —arthritic adj.... arthritis
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