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OpenTrials
Completed

NCT Number: NCT03678961

The Effect of Leg Position on the Sciatic Nerve on Sonogram

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.

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Key information

Conditions

Sciatic Nerve Block

Age range

18 year–80 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Asan Medical Center

Seoul, 05505, South Korea

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

external rotation of leg

Behavioral

external rotation of leg by 45 degrees

hip flexion and knee flexion

Behavioral

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

Primary outcomes

  1. Visibility of sciatic nerve

    Time frame: 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 outcomes

  1. Depth of sciatic nerve

    Time frame: during 10 minutes of anesthesia induction

    Distance from skin to sciatic nerve at each position

Sponsors and collaborators

Lead sponsor

Asan Medical Center

Other

Registry information

Official study title

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

Important dates

Study start
2018
Primary completion
2018
Study completion
2018
First posted
Sep 20, 2018
Registry last updated
Dec 20, 2018

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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