Sciatic Nerve Block
Conditions
Brief 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.
Interventions
BEHAVIORALexternal rotation of leg
external rotation of leg by 45 degrees
BEHAVIORALhip flexion and knee flexion
hip flexion by 15/45 degrees and knee flexion by 15/45 degrees
Sponsors
Asan Medical Center
Study design
Observational model
CASE_CROSSOVER
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 80 Years
Healthy volunteers
No
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Visibility of sciatic nerve | 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
| Measure | Time frame | Description |
|---|---|---|
| Depth of sciatic nerve | during 10 minutes of anesthesia induction | Distance from skin to sciatic nerve at each position |
Countries
South Korea
Outcome results
None listed