 Two hours before surgery, patients will receive 75mg of pregabalin. Patients will be placed on a patient-controlled anesthesia pump PCA for 24 hours. On post-operative day one, the patients will be switched to oral oxycodone as needed with supplementation with IV Demerol for breakthrough pain. In addition, patients will receive either pregabalin 75mg orally PO BID, pregabalin 150mg PO BID or placebo beginning on the day of surgery until discharge. 