IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-9-7-30988 Original Research Paper EPIDURAL BUPIVACAINE WITH BUTORPHANOL VERSUS EPIDURAL BUPIVACAINE WITH TRAMADOL FOR POSTOPERATIVE PAIN RELIEF IN ORTHOPEDIC HIP OR LOWER LIMB SURGERIES- A COMPARATIVE EVALUATION M.Rama Bhupal Reddy Dr. July 2020 9 7 01 02