Study Interventions and Measures: Subjects are provided celecoxib or placebo in scheduled doses every 12 hours for 5 days, then continue until they are pain-free, for a maximum of 10 days. Throughout the study, they are allowed to use oxycodone/acetaminophen as needed for additional pain control, following standard clinical care. Acetaminophen is used around the clock for the first 5 days in all subjects. For 14 days following surgery, subjects record pain levels on validated pain scale instruments, quantity of narcotic medication and acetaminophen required, and time to return to normal diet. All Emergency Department and hospital admissions during the 30 postoperative days are recorded, noting incidence of excess pain, dehydration, hemorrhage, and other complications.