<qa>  What is the placebo b.i.d.?Participants will be prospectively randomized in a 1:1 ratio to receive 200 mg of celecoxib or placebo b.i.d. in a double-blind fashion, initiated the night prior to surgery, and continued for six days thereafter. The randomization sequence will be generated and implemented by the institutional investigational pharmacy. Placebo medication, identical to the study medication, will also be provided by the institutional pharmacy. 