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.

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