Ultrasound Evaluation of Two Anatomic Landmarks in Spinal Anesthesia for Cesarean Section: the Posterior Superior Iliac Spine VS Iliac Crest

Intercristal line as palpation landmarks to identifying the vertebral level is frequently inaccurate.To find more safe and reliable body surface markers and convenient methods to be solved in clinical work.The investigators performed a two-stage study to evaluated the accuracy of intercristal line and the The Posterior Superior Iliac Spine (PSIS) line to identify the lumbar interspinous spaces for spinal anesthesia using ultrasonography in pregnant woman which will provide a second option.

NCT Number	NCT06711601
Lead Sponsor	The Third Affiliated Hospital of Guangzhou Medical University
Conditions	Spinal Anesthesia, Ultrasonography, Posterior Superior Iliac Spine, Intercristal Line
Enrollment	650 participants
Start Date	2024-12-01
Primary Completion	2025-12-30 (estimated)
Study Completion	2026-01-23 (estimated)
Updated on ClinicalTrials.gov	2026-07-20