NEW YORK (Reuters Health)—Diclofenac patches appear to be the most effective topical nonsteroidal anti-inflammatory drug (NSAID) for osteoarthritis (OA), according to a new systematic review and network meta-analysis. “Topical NSAIDs were effective and safe for OA,” Dr. Weiya Zhang of the University of Nottingham and City Hospital in the UK and colleagues write. “However, confirmation…