BACKGROUND	We designed this randomized , double-blind , placebo-controlled study to evaluate the effect of postoperative administration of either a nonselective nonsteroidal antiinflammatory drug ( ibuprofen ) or the cyclooxygenase-2 selective inhibitor ( celecoxib when administered as part of a multimodal analgesic regimen ) on the severity of pain , the need for rescue analgesics , and clinically relevant patient outcomes after ambulatory surgery .\