Inclusion Criteria:  Age between 18 and 65 years ASA grade I to II Patients scheduled for hip replacement surgeries under subarachnoid block (SAB) e.g. hip hemi-arthroplasty, total hip arthroplasty  Exclusion Criteria:  Patient refusal Age below 18 or above 65 years. ASA grade III to IV Patients with known allergies to any of the drugs used. Contraindication to SAB eg. Coagulopathy, infection at the injection site, severe cardiopulmonary disease, diabetic or other neuropathies. Patients receiving opioids for chronic analgesic therapy Inability to comprehend visual analogue scale (VAS) Infection at site of erector spinae or fascia iliaca block. Body mass index >35 kg/m2