60 patients made spinal anesthesia by mixture of bupivacaine hyperbaric 0.5% 5mg/1 meter and fentanyl 30mcg were divided into two groups: the first group (n=30): when surgeons removed trocars, patients were received intraarticular morphine injection 10mg / ml through trocar ports and the second group (n=30): after finishing surgeries, patients were received subcutaneous morphine injection 10mg/1ml.