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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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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Group N | Neutral position | ||
| Group E | External rotation of leg by 45 degrees |
| |
| Group EF45 | External rotation of leg by 45 degrees, hip flexion by 45 degrees, and knee flexion by 45 degrees |
| |
| Group EF15 | External rotation of leg by 45 degrees, hip flexion by 15 degrees, and knee flexion by 15 degrees |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| external rotation of leg | Behavioral | external rotation of leg by 45 degrees |
|
| Measure | Description | Time Frame |
|---|---|---|
| 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.) | during 10 minutes of anesthesia induction |
| Measure | Description | Time Frame |
|---|---|---|
| Depth of sciatic nerve | Distance from skin to sciatic nerve at each position | during 10 minutes of anesthesia induction |
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Inclusion Criteria:
Exclusion Criteria:
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Patients undergoing knee surgery requiring peripheral nerve block
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| Name | Affiliation | Role |
|---|---|---|
| Won Uk Koh, M.D., Ph.D. | University of Ulsan, College of Medicine, Asan Medical Center | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Asan Medical Center | Seoul | 05505 | South Korea |
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| hip flexion and knee flexion | Behavioral | hip flexion by 15/45 degrees and knee flexion by 15/45 degrees |
|