Inflammation of a joint and its synovial membrane (the tissue that produces fluid inside joints).
From Greek 'arthron' (joint) + 'synovial' (relating to joint fluid, possibly from 'syn-' meaning together + ovum, or from 'syn-' + 'ova' meaning 'like egg') + '-itis' (inflammation). This precise term targets both the joint capsule and its fluid-producing lining.
Your joints produce their own lubricating oil called synovial fluid—when arthrosynovitis develops, the joint becomes inflamed and produces too much fluid, making movement painful and swollen, which is why doctors specifically name this combination of problems rather than just calling it arthritis.
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