NEW YORK, June 30, 2020 /PRNewswire/ — In patients with rheumatoid arthritis (RA), higher disease activity — not post-operative flares — increases the risk of pain and poor function one year after a total hip arthroplasty (THA) or total knee arthroplasty (TKA), according to a new study by researchers at Hospital for Special Surgery (HSS) in New York City. …