1. What data in particular will be shared?
   Response - Individual participant data that underlie the results reported in this article, after de-identification (text, tables, figures, and appendices).
   


2. What additional supporting information will be shared?
   Response -  Study Protocol
   Response -  Statistical Analysis Plan
   Response - Informed Consent Form
   
   
3. Who will be able to view these files?
   Response - Researchers whose proposed use of the data has been approved by an independent review committee identified for this purpose.
   


4. For what types of analyses will this data be available?
   Response - For individual participant data meta-analysis.
   


5. By what mechanism will data be made available?
   Response - Proposals should be directed to [drmsadik@gmail.com].
   


6. For how long will this data be available start date provided 01-10-2027 and end date provided 30-09-2032?
   Response - Beginning 3 months and ending 5 years following article publication.
   


7. Any URL or additional information regarding plan/policy for sharing IPD? 
   Additional Information - NIL

Surgical procedures on the spine often result in significant postoperative pain, with inadequate pain control affecting recovery and increasing chronic pain risk. Traditionally, opioids have been used for pain management, but ERAS protocols encourage a multimodal approach to reduce opioid reliance. Regional anesthesia techniques, particularly peripheral nerve blocks like the erector spinae plane (ESP) block and retrolaminar (RL) block, are gaining attention for their effectiveness and fewer side effects compared to neuraxial methods. The ESP block targets spinal nerve rami and sympathetic nerves, while the RL block focuses on dorsal rami. Both techniques have shown promise in reducing pain and opioid consumption, but more comparative studies are needed to determine the best option for postoperative analgesia in spine surgery. 

In the present study, patients will be randomly assigned to receive either a Retrolaminar block (RL) or an Erector Spinae Plane block (ES). Patients will undergo routine evaluations and fasting protocols. In the operating room, ASA standard monitors will be attached, induction of anesthesia will be performed, and the allocated block will be performed using ultrasound guidance after placing the patients in the surgical position (prone).

Group ‘RLB’ (Retrolaminar Block )- All patients will receive ultrasound (US) guided Retrolaminar block with 15 mL of 0.375% Ropivacaine on either side.

Group ‘ESPB’(Erector Spinae Plane Block)-All patients will receive ultrasound guided Erector Spinae Plane Block with 15 ml of 0.375% Ropivacaine on either side.

Block performance time, number of attempts, and complications will be recorded. Anesthesia maintenance will include isoflurane and rocuronium, with intraoperative analgesia provided by fentanyl and paracetamol. Postoperative pain will be assessed using a numerical rating scale (NRS), and rescue analgesia will be administered as needed. Side effects and patient satisfaction will also be documented throughout the study period.