The Effect of Leg Position on the Sciatic Nerve on Sonogram

Influence of Lower Extremity Positioning During Anterior-approach Ultrasound-guided Sciatic Nerve Block: Depth and Visibility

Little is known about which posture of lower extremity makes it easier to access to the sciatic nerve. In this study, the investigators aimed to identify the most appropriate positioning of the lower extremity during anterior-approach ultrasound-guided sciatic nerve block.

Study Overview

• Status: Completed
• Conditions: Sciatic Nerve Block
• Intervention / Treatment: Behavioral: external rotation of leg; Behavioral: hip flexion and knee flexion

• Study Type: Observational
• Enrollment (Actual): 45

Contacts and Locations

Study Locations

• Korea, Republic of
  • Seoul, Korea, Republic of, 05505
    • Asan Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 80 years (ADULT, OLDER_ADULT)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Probability Sample

Study Population

Patients undergoing knee surgery requiring peripheral nerve block

Description

Inclusion Criteria:

• ASA PS 1-3
• patients undergoing knee surgery requiring peripheral nerve block

Exclusion Criteria:

• patients who refuse to participate in the study
• BMI > 40 kg/m2
• patients who have congenital abnormality on leg
• patients who have surgery or trauma on hip/knee
• patients who cannot move freely due to the contracture
• patients who are judged ineligible by the medical staff to participate in the study for other reasons

Study Plan

How is the study designed?

Number of groups / cohorts

4

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
Group N; Neutral position
Group E; External rotation of leg by 45 degrees	Behavioral: external rotation of leg; external rotation of leg by 45 degrees
Group EF45; External rotation of leg by 45 degrees, hip flexion by 45 degrees, and knee flexion by 45 degrees	Behavioral: external rotation of leg; external rotation of leg by 45 degrees; Behavioral: hip flexion and knee flexion; hip flexion by 15/45 degrees and knee flexion by 15/45 degrees
Group EF15; External rotation of leg by 45 degrees, hip flexion by 15 degrees, and knee flexion by 15 degrees	Behavioral: external rotation of leg; external rotation of leg by 45 degrees; Behavioral: hip flexion and knee flexion; hip flexion by 15/45 degrees and knee flexion by 15/45 degrees

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Visibility of sciatic nerve	Visibility of sciatic nerve at each position assessed using a scoring system (0, no nerve identified; 1, nerve identified with a high probability; 2, nerve identified, but most of it not visible; 3, nerve identified, more than 50% of its borders can be precisely distinguished from surrounding structures; 4, nerve completely visible, but fascicles poorly defined; 5, nerve completely visible and multiple fascicles identifiable.)	during 10 minutes of anesthesia induction

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Depth of sciatic nerve	Distance from skin to sciatic nerve at each position	during 10 minutes of anesthesia induction

Collaborators and Investigators

• Sponsor: Asan Medical Center

Study record dates

Study Major Dates

• Study Start (ACTUAL): August 30, 2018
• Primary Completion (ACTUAL): October 11, 2018
• Study Completion (ACTUAL): October 11, 2018

Study Registration Dates

• First Submitted: August 17, 2018
• First Submitted That Met QC Criteria: September 19, 2018
• First Posted (ACTUAL): September 20, 2018

Study Record Updates

• Last Update Posted (ACTUAL): December 20, 2018
• Last Update Submitted That Met QC Criteria: December 19, 2018
• Last Verified: December 1, 2018

More Information

Terms related to this study

• Other Study ID Numbers: 2018-0970

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No