Pain levels are higher in the first few days after orthopaedic surgery compared to those of patients who had undergone other types of surgery.1 Lower limb pain post-operatively in orthopaedic surgery can be treated by various methods, such as an epidural, a posterior or anterolateral lumbar plexus block, or a combination of these and multimodal analgesia.2 It has been argued by many experts to be an effective analgesic option that can reduce the use of opioids and other analgesics, along with their associated negative effects, as part of a multimodal approach. Our study will be focusing on comparing IV analgesia and peripheral nerve block. Aim: To evaluate and efficacy of IV Ketorolac and 0.25% Bupivacaine in lumbar plexus block for postoperative following hip arthroplasty done in the patient under spinal anesthesia. Method: A prospective, randomized, single-blind, controlled study where a total of 60 ASA 1 & 2 adult patients of either gender undergoing elective total hip arthroplasty under spinal anesthesia were randomized and either were administered IV Ketorolac or were given lumbar plexus block postoperatively for post-operative analgesia. VAS score was evaluated every 2 hours for 12 hours postoperatively and the time of the requirement of the first rescue analgesia was also noted also hemodynamic parameters including heart rate and non-invasive blood pressure were monitored. Results: There was not much change in the hemodynamics of the patient. Whereas it was noted that the VAS score for lumbar plexus block was less compared to the IV ketorolac, also the requirement of rescue analgesia was less in patients with the lumbar plexus block. Conclusion: From the study, it was concluded the lumbar plexus block provides better postoperative analgesia as compared to IV ketorolac in patients undergoing total hip arthroplasty.