In the operating room, after securing 18G IV cannula, all standard monitors will be attached (NIBP, SPO2, ECG, Temperature probe, foley's catheterization). Patients will be premedicated with inj. Ondansetron-4mg IV stat and inj. Midazolam- 1mg IV stat in both the groups before starting the procedure. Group S (SAB)- patients will be preloaded with 10mg/kg Ringer lactate. Subarachnoid block in L3-L4, L4-L5 space with 0.5% Bupivacaine (Hyperbaric)-2.5ml will be given in lateral position with involved limb in dependent position. Patient kept in same position for 15 minutes and then turned supine. Group B (peripheral nerve block)- femoral 3 in 1 block in supine position(with landmark technique) will be given with 20 ml of 0.25% of Bupivacaine followed by sciatic block in Labat's approach in lateral position with 20 ml of 0.25% Bupivacaine .