Ultrasound-Guided Lumbosacral Plexus Block Delivers Superior Postoperative Analgesia compared to Epidural: Study

Managing pain after lower limb orthopedic surgery is a daily challenge for anesthesiologists. While lumbar epidural analgesia remains a standard choice, recent advances in ultrasound-guided nerve blocks are opening new doors. A recent randomized controlled study provides compelling evidence for the effectiveness and safety of a single puncture, dual injection, anterior approach to the lumbosacral plexus—potentially shifting the paradigm in perioperative pain management.

The Rationale: Why Consider a New Approach?

Traditional lumbosacral plexus blocks require multiple injections and patient repositioning, limiting their routine use. The lumbar epidural is effective but can cause side effects such as hypotension and postoperative nausea and vomiting (PONV). This study investigated whether a novel, anterior ultrasound-guided block could provide equivalent or better analgesia with fewer complications.

Study Design at a Glance

Population: 134 adults undergoing unilateral lower limb orthopedic surgery

Randomization: Patients received either a lumbar epidural (Group E) or an ultrasound-guided, single puncture, dual injection anterior lumbosacral plexus block (Group B)

Protocol: All patients had spinal anesthesia for the procedure, followed by their assigned block for postoperative analgesia. Both groups used patient-controlled epidural analgesia (PCEA) postoperatively.

Outcomes: Pain scores (NRS), sensory and motor block, rescue analgesia need, complications, and patient satisfaction were compared across 24 hours.

Key Results: Analgesia, Safety, and Satisfaction

Superior pain control: Group B consistently had lower NRS pain scores at all measured time points, both at rest and during movement, compared to the epidural group.

Reduced rescue analgesia: Significantly fewer patients in the nerve block group required additional analgesics.

Lower side effect profile: Hypotension and PONV were less common with the nerve block, while no patients in either group had serious adverse events like respiratory depression or urinary retention.

Higher patient satisfaction: Median satisfaction scores were significantly better for the nerve block group.

Why This Matters for Your Practice

This study is especially relevant for anesthesiologists and perioperative teams seeking to optimize recovery pathways. Ultrasound-guided anterior lumbosacral plexus block offers a practical, reproducible, and potentially safer alternative to lumbar epidural—without sacrificing analgesic quality. The technique allows for supine positioning, reducing patient discomfort and workflow disruption.

Practical Considerations and Next Steps

While these results are promising, certain caveats apply. The study was limited to a 24-hour follow-up and included a range of lower limb surgeries. Further multicenter trials and longer-term assessments will help refine best practices, clarify block duration, and gauge functional recovery advantages.

Conclusion

For unilateral lower limb orthopedic procedures, a single puncture, dual injection anterior lumbosacral plexus block under ultrasound guidance may offer superior analgesia, fewer complications, and greater patient satisfaction compared to traditional epidural analgesia.

5 Key Takeaways

Ultrasound-guided lumbosacral plexus block outperformed lumbar epidural for pain control after lower limb orthopedic surgery.

Patients required fewer PCEA boluses and rescue analgesics with the nerve block approach.

Lower incidence of hypotension and PONV was observed with the nerve block.

Patient satisfaction was significantly higher with the anterior lumbosacral plexus block.

Technique is practical, safe, and may streamline perioperative care for lower limb surgeries.

Citation: Kaur S, Mohammed S, Chhabra S, Kumar R, Paliwal B, Gahlot N, et al. Analgesic efficacy of an ultrasound‑guided single puncture, dual injection, anterior approach targeting branches of the lumbosacral plexus versus lumbar epidural for unilateral lower limb orthopedic surgery: A randomized controlled study. Journal of Anaesthesiology Clinical Pharmacology. 2026;42(3):392-399. doi:10.4103/joacp.joacp_394_25.