The Effect of Leg Position on the Sciatic Nerve on Sonogram

Asan Medical Center45 enrolled

Overview

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 Type

OBSERVATIONAL

Enrollment

Conditions

Sciatic Nerve Block

Interventions

external rotation of legBEHAVIORAL

external rotation of leg by 45 degrees

hip flexion and knee flexionBEHAVIORAL

hip flexion by 15/45 degrees and knee flexion by 15/45 degrees

Eligibility

Sex: ALLMin age: 18 YearsMax age: 80 Years

Medical Language ↔ Plain English

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

Locations (1)

Asan Medical Center

Seoul, South Korea

Outcomes

Primary Outcomes

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.)

Time frame: during 10 minutes of anesthesia induction

Secondary Outcomes

Depth of sciatic nerve

Distance from skin to sciatic nerve at each position

Time frame: during 10 minutes of anesthesia induction

Data from ClinicalTrials.gov

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