On arrival to the pre-operative holding area half hour before the scheduled surgery. Patient will be connected to basal monitoring devices; pulse oximetry and non- invasive blood pressure. Fascia iliaca compartment block will be performed with the aid of ultrasound device in all cases.The injected local anesthetic solution will be prepared by a staff member who was not involved in the study) according to the randomization. After 20 minutes from the injection the investigators will assessed nerves that had been blocked.