1) Inflammation 2) Redness 3) Rubor 
• (n.) An effusion of watery liquid into the cavity of a joint.
(hi″drahr-thro´sis) an accumulation of watery fluid in the cavity of a joint. adj., hydrarthro´dial., adj.
Hy`drar·thro'sis noun [ New Latin See Hydro- , 1, and Arthrosis .] (Medicine) An effusion of watery liquid into the cavity of a joint. 
Type: Term Pronunciation: hī′drar-thrō′sis Definitions: 1. Effusion of a serous fluid into a joint cavity.
[n] - inflammation and swelling of a movable joint because of excess synovial fluid
hydrarthrosis 1. An effusion of watery liquid into the cavity of a joint. 2. Inflammation and swelling of a movable joint because of excess synovial fluid.