The Effect of Leg Position on the Sciatic Nerve on Sonogram

Completed

• Conditions: Sciatic Nerve Block
• Interventions: Behavioral: external rotation of leg; Behavioral: hip flexion and knee flexion

• Registration Number: NCT03678961
• Lead Sponsor: Asan Medical Center

Brief Summary

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.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2018-08-17
• Study Start: 2018-08-30
• Study First Submitted QC: 2018-09-19
• Study First Posted: 2018-09-20
• Primary Completion: 2018-10-11
• Study Completion: 2018-10-11
• Status Verified: 2018-12
• Last Update Submitted: 2018-12-19
• Last Update Posted: 2018-12-20

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 45

Inclusion Criteria

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

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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

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Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Group EF45	external rotation of leg	External rotation of leg by 45 degrees, hip flexion by 45 degrees, and knee flexion by 45 degrees
Group EF45	hip flexion and knee flexion	External rotation of leg by 45 degrees, hip flexion by 45 degrees, and knee flexion by 45 degrees
Group EF15	hip flexion and knee flexion	External rotation of leg by 45 degrees, hip flexion by 15 degrees, and knee flexion by 15 degrees
Group EF15	external rotation of leg	External rotation of leg by 45 degrees, hip flexion by 15 degrees, and knee flexion by 15 degrees
Group E	external rotation of leg	External rotation of leg by 45 degrees

Primary Outcome Measures

Name	Time	Method
Visibility of sciatic nerve	during 10 minutes of anesthesia induction	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.)

Secondary Outcome Measures

Name	Time	Method
Depth of sciatic nerve	during 10 minutes of anesthesia induction	Distance from skin to sciatic nerve at each position

Trial Locations

Locations (1)

Asan Medical Center; 🇰🇷 Seoul, Korea, Republic of