Immediate postoperatory pain control is an important aspect to be considered. Patients submitted to TKA endure pain with variations between 40-80 (according to analog visual scale -AVS - which goes from zero to 100) during the immediate postoperatory, with slow decline in the first 24 hours. Pain classified as severe occurs in 60% and moderated in 30% of patients submitted to TKA during this period of time. Therefore adequate pain management allows an earlier rehabilitation, with a higher satisfaction rate and decrease the hospitalization period.