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Double space combined spinal epidural anaesthesia (CSEA) is one of the techniques of anaesthetic armamentarium, which can be used as the sole technique of anaesthesia and continued for relief of postoperative pain. A prospective, randomized, and controlled study was conducted involving 90 patients of ASA physical status I& II coming for elective lower limb orthopaedic surgeries, carried under spinal anaesthesia with 2.5 ml bupivacaine heavy(0.5%) given intrathecally. Epidurally,0.125% bupivacaine alone, or along with morphine 2.5 mg or tramadol 75 mg was administered postoperatively, at two segment sensory regression. The duration of analgesia or the time to first top-up dose in the study groups were 206.8 ± 97.5minutes, 507.3 ± 228.6 minutes and 399.3 ± 152.1 minutes respectively, in bupivacaine group, morphine-bupivacaine group and tramadol-bupivacaine group. None of the patients in the study groups demonstrated motor block after 2 hours of observation period. None of the patients in the study groups had respiratory depression. The double space technique is also economical to the patients, which is a major advantage in our country.