Does the Use of Intrathecal Morphine Increase the Length of Hospital Stay in Fast Track Orthopedic Procedures?

This is a clinical trial of intrathecal morphine for patients Patient with primary as well as revision knee and hip arthroplasty under regional anesthesia. This study would include a total of 134 patients. It is the intention to randomize these patients postoperatively into 2 groups of patients: Group 1 - Patients will receive intrathecal morphine 100 mcg in addition to the standard dose of bupivacaine and 15 mcg of fentanyl for spinal anesthesia. Group 2 - Patients will not receive intrathecal morphine. Patients will receive only bupivacaine and 15 mcg of fentanyl for spinal anesthesia. It is postulated that the use of intrathecal morphine may be associated with an increase length of stay in the hospital.