Introduction: Effective postoperative pain management is crucial for recovery after lower limb orthopedic surgeries. This study compares the efficacy of Bupivacaine and Lidocaine in spinal anesthesia regarding postoperative pain control, utilizing the Visual Analog Scale (VAS) for pain assessment.

Material and Methods: In this prospective, observational study, 50 patients undergoing lower limb orthopedic surgery at Department of Anesthesia, Meenakshi Medical College Hospital and Research Institute and were randomly assigned to receive either Bupivacaine (Group I, n=25) or Lidocaine (Group II, n=25) for spinal anesthesia. The primary outcome was postoperative pain scores measured using VAS at 1, 2, 4, 6, 12, and 24 hours postoperatively. Secondary outcomes included the onset and duration of sensory and motor blockade, and the overall duration of anesthesia. Statistical analysis involved independent samples t-tests to compare pain scores between groups at each time point.

Results: Group I exhibited significantly lower VAS pain scores at 1, 2, 12, and 24 hours post-operation (p<0.05), indicating better pain control compared to Group II. The onset of sensory and motor blockade was faster in Group II, but the duration of anesthesia was significantly longer in Group I (p<0.05). No significant differences were observed at 4 and 6 hours postoperatively.