Has anyone had any experience using vioxx for pre-emptive analgesia and if so for what type of cases and did it work? I have gotten the approval from my anesthesia group to do a study on this and would like any kind of input. I have read the case studies and I know a group in Mass. outpatient clinic that swears by this for arthro knee cases. I will be looking at the efficacy of this in the lap chole population.