There is, however, limited data in humans and further prospective randomised studies are warranted. Ekman et al studied in a prospective randomised double blind study the effects of celecoxib, a selective cox-II-inhibitor, on pain and bone healing following spine surgery. They found significant effects on reduction of pain and need for opioid analgesics postoperatively but could see no negative effects the numbers of "none-unions" at a 1-year follow up 3.