pneumarthrosis

Presence of air in a joint. [G. pneuma, air, + arthron, joint, + -osis, condition]

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pneu·mar·thro·sis (noo″mahr-throґsis) [pneumo- + arthro- + -osis] 1. the presence of gas or air in a joint. 2. the inflation of a joint with air or gas for the purpose of aiding radiographic examination.