The Effect of Leg Position on the Sciatic Nerve on Sonogram

Sciatic Nerve Block Clinical Trial

Official title:

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

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03678961
• Other study ID #: 2018-0970
• Status: Completed
• Start date: August 30, 2018
• Est. completion date: October 11, 2018

Study information

• Verified date: December 2018
• Source: Asan Medical Center
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial 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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 45
• Est. completion date: October 11, 2018
• Est. primary completion date: October 11, 2018
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years to 80 Years

Eligibility

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

Related Conditions & MeSH terms

• Sciatic Nerve Block

Intervention

Behavioral:
• external rotation of leg
external rotation of leg by 45 degrees
• hip flexion and knee flexion
hip flexion by 15/45 degrees and knee flexion by 15/45 degrees

Locations

Country	Name	City	State
Korea, Republic of	Asan Medical Center	Seoul

Sponsors (1)

Lead Sponsor	Collaborator
Asan Medical Center

Country where clinical trial is conducted

Korea, Republic of, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	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	Depth of sciatic nerve	Distance from skin to sciatic nerve at each position	during 10 minutes of anesthesia induction