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ClinicalTrials.gov ID

NCT07396961

Lead Sponsor

Kangbuk Samsung HospitalOTHER

Overall Status

Not yet recruiting

Study Type

Observational

Enrollment

140Estimated

Last Update Posted

Feb 9, 2026Actual

Start Date

Feb 20, 2026Estimated

Primary Completion Date

Feb 20, 2027Estimated

Completion Date

Feb 20, 2028Estimated

Official Title

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

Brief 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.

• Spinal Anesthesia Evaluation
• Lumbar Vertebrae

• Lumbar Ultrasound & Palpation

Ages Eligible for Study

Adult (18-64)Older Adult (65+)

Sexes Eligible for Study

All

Accepts Healthy Volunteers

No

Eligibility Criteria

Inclusion Criteria:

• Adults aged 18 to 85 years
• Patients scheduled for spinal anesthesia or lumbar ultrasound
• Participants who voluntarily agreed to participate and provided written informed consent

Exclusion Criteria:

• History of spinal surgery or spinal deformity
• Infection or wounds at the puncture site
• Inability to maintain the lateral decubitus position
• Congenital lumbosacral transitional vertebrae (e.g., sacralized L5 or lumbarized S1)
• Any other condition deemed unsuitable for the study by the investigator

Observational Model

Cohort

Time Perspective

Prospective

Lead Sponsor

Kangbuk Samsung HospitalOTHER

hoho4321.lee@samsung.com