To compare the role of anti-depressants (Desipramine) and NSAID (Dexibuprofen) in monosodium iodo acetate (MIA) induced chronic knee osteoarthritis (OA) in rats. Twenty four male wistar rats were divided into 4 groups of 6 animals each. Group I to IV served as Vehicle control, OA control, Desipramine and Dexibuprofen treated groups respectively. Group I received I.A. Injection of 50µl of  0.9%normal saline, and Group II to IV received I.A. Injection of 50µl MIA, and the treatment of drugs started on the same day. The animals will be monitored for  osteoarthritis parameters and/or depression on pre-dose day (day 0) and on day 1, 3, 5, 7, 11  14, 18, 21 and 28 th day. The rise in knee inflammation is almost similar in all MIA treated groups (p