Inclusion Criteria:  Age 18-60 years. Sex: Both sexes. Height 155-170 cm. American Society of Anaesthesiologists (ASA) Physical Status Class-I and II. Scheduled for anterior cruciate ligament under spinal anaesthesia.  Exclusion Criteria:  Declining to give written informed consent. History of allergy to the medications used in the study. Contraindications to regional anesthesia (including coagulopathy and local infection). Psychiatric disorder.