Aim: Spinal anaesthesia is commonly utilized in lower limb orthopaedic surgeries due to its ease of performance and high success rate. The aim of this prospective randomized study was to assess the intra- and postoperative advantages and complications of unilateral and bilateral spinal anaesthesia, providing a comparative analysis of both techniques. Materials and Methods: The study involved dividing 50 patients into two randomized groups, A and B, for comparing the effects of different spinal anaesthesia techniques. Group A received standard spinal anaesthesia on even days, while Group B received unilateral spinal anaesthesia on odd days. Patients aged 18 to 60 years with ASA class I or II were included, with exclusion criteria such as a history of certain medical conditions or inability to be placed in a lateral position. Data analysis was done using SSPS software. Results: The bilateral group had 18 male participants and 7 female participants, whereas the unilateral group had 21 male participants and 4 female participants. The average duration of surgery in the bilateral group was 93.51 minutes, while in the unilateral group, it was 92.12 minutes. Duration of motor and sensory block was significantly higher among patients of the bilateral group. Conclusion: Employing a low-dose, low-volume, and low-flow injection technique for unilateral spinal anaesthesia has demonstrated efficacy in providing sufficient sensory-motor block and maintaining stable hemodynamic parameters during lower limb orthopaedic surgery.