الفهرس 
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Abstract
This study was carried out on 50patients undergoing elective unilateral knee surgery. Exclusion criteria included patients with contraindications to regional anaesthesia, psychological or neuromuscular disorders, receiving chronic analgesics and obese patients. Careful preoperative evolution was done. Patients were randomly assigned into 2 groups Spinal group: Patient received 3.5ml ropivacaine 0.75% in lateral position. Sciaticfemoral group: Winnies landmarks for the 3in1 femoral nerve block using 12ml then classic Labat approach modified by Winnie for sciatic nerve block using 18 ml. Haemodynamic, the time for performance and for achievement of surgical anaesthesia as well as complications, resolution of both sensory and motor blockade was recorded and was significantly shorter in spinal group with more incidences of complications. we can conclude that spinal anaesthesia or sciaticfemoral nerve block provide adequate anaesthesia for ambulatory knee surgery and peripheral nerve blocks and associated with a lower incidence of side effects than spinal anaesthesia but requiring expert anaesthesiologist.