NCT07396961

Consistency of ASIS Line vs. Tuffier's Line for Lumbar Level Identification

Evaluation of the Consistency of the ASIS Line for Lumbar Level Identification in the Lateral Decubitus Position: Comparison With the Tuffier's Line

• Status: Not Yet Recruiting
• Phase: —
• Study type: Observational
• Enrollment: 140 (estimated)
• Sponsor: Kangbuk Samsung Hospital · Academic / Other
• Sex: All
• Age: 18 Years – 85 Years
• Healthy volunteers: Not accepted

Summary

Tuffier's line is commonly used as a landmark for estimating lumbar vertebral levels during spinal anesthesia. However, its accuracy can vary depending on factors such as age, sex, BMI, and posture. This study evaluates the consistency of an alternative landmark, the "ASIS line" (a line connecting both Anterior Superior Iliac Spines), for identifying lumbar levels in the lateral decubitus position. Researchers will mark both the ASIS line and Tuffier's line on participants and use ultrasound to verify the exact vertebral level where each line crosses the spine. The goal is to determine if the ASIS line provides a more consistent and reliable estimation of lumbar levels compared to Tuffier's line.

Conditions

• Spinal Anesthesia Evaluation
• Lumbar Vertebrae

Interventions

Type	Name	Description
DIAGNOSTIC_TEST	Lumbar Ultrasound & Palpation	Identification of vertebral levels using Tuffier's line (palpation) and ASIS line, followed by ultrasound verification.

Timeline

• Start date: 2026-02-20
• Primary completion: 2027-02-20
• Completion: 2028-02-20
• First posted: 2026-02-09
• Last updated: 2026-02-09

Locations

2 sites across 1 country: South Korea