This study is designed as a randomized controlled trial aiming to evaluate the feasibility and safety of ultrasound-guided mid-femoral lateral approach sciatic nerve paraneural sheath block, in order to provide a new sciatic nerve block approach for clinical practice that offers greater patient comfort and higher precision, thereby facilitating its use for specific patient populations and less experienced operators.
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Rate of complete sensory blockade in the sciatic nerve distribution at 30 minutes after block completion
Timeframe: At 30 minutes after completion of the local anesthetic injection.