Ultrasound-guided midthigh sciatic nerve block-a clinical and anatomical study

Area of Science:

• Anesthesiology
• Regional Anesthesia
• Medical Imaging

Background:

• Ultrasound-guided sciatic nerve block is an emerging regional anesthesia technique.
• Limited literature exists on its application and anatomical considerations in the midthigh region.

Purpose of the Study:

• To evaluate the feasibility of ultrasound imaging for the sciatic nerve in the midthigh.
• To describe the surrounding anatomy relevant to ultrasound-guided sciatic nerve blocks.

Main Methods:

• Prospective observational study of 40 patients undergoing surgery requiring sciatic nerve block.
• Ultrasound scanning between the gluteal and popliteal regions.
• Anatomical confirmation using unembalmed cadavers and literature review.

Main Results:

• Successful ultrasound identification of the sciatic nerve in 95% of patients.
• Nerve stimulation was required in 37.5% of cases for confirmation.
• Key sonographic landmarks including surrounding muscles and fascial planes were identified.

Conclusions:

• Ultrasound is effective for sciatic nerve identification at the midthigh.
• Understanding surrounding anatomy improves nerve localization for ultrasound-guided blocks.
• Nerve stimulation may still be necessary for confirmation in some cases.