Before performing any analysis, the distribution of all variables will be examined for appropriateness of distribution assumptions. Descriptive statistics will be summarized for all variables including demographics, duration of analgesia, VAS scores during rest and after surgery, time for 1st rescue analgesia, total dose of rescue analgesia received in 24 hrs and side effects. Mean ± SD will be reported for continuous variables and frequency (percentage) will be reported for discrete variables. Analysis of variance or Kruskal-Wallis test as appropriate will be used to analyze and compare the primary endpoint VAS among two groups as well as the secondary endpoints. Chi-square test or extended Fisher's exact test as appropriate will be used for the comparison of the incidence of chronic pain as well as other side effects. All analyses will be performed using SAS 9.3 (Cary, NC) and a p-value less than 0.05 will be considered as statistically significant.