The Effect of Leg Position on the Sciatic Nerve on Sonogram

Asan Medical Center

Status: Completed

Conditions: Sciatic Nerve Block

Treatments: Behavioral: external rotation of leg; Behavioral: hip flexion and knee flexion

Study type: Observational

Funder types: Other

Identifiers

NCT03678961

2018-0970

Details and patient eligibility

About

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.

Enrollment: 45 patients

Sex: All

Ages: 18 to 80 years old

Volunteers: No Healthy Volunteers

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

Trial design

45 participants in 4 patient groups

Group N

Description:

Neutral position

Group E

Description:

External rotation of leg by 45 degrees

Treatment:

Behavioral: external rotation of leg

Group EF45

Description:

External rotation of leg by 45 degrees, hip flexion by 45 degrees, and knee flexion by 45 degrees

Treatment:

Behavioral: hip flexion and knee flexion

Behavioral: external rotation of leg

Group EF15

Description:

External rotation of leg by 45 degrees, hip flexion by 15 degrees, and knee flexion by 15 degrees

Treatment:

Behavioral: hip flexion and knee flexion

Behavioral: external rotation of leg