- A diagnosis of: a) Adult onset RA as defined by the 1987 ACR classification criteria (see Appendix 1), with at least 4 tender and 4 swollen joints at screening (Day 1). Tender/swollen joints must be a part of the 28-joint count included in the Disease Assessment Score 28 (DAS28) assessment; b) Osteoarthritis (OA) of the knee or acute pseudogout attack of the knee.