Sonography-guided Pericapsular Never Group Block for Hip Arthroplasty

Sonography-guided Pericapsular Nerve Group Block for Hip Arthroplasty

In this study, the investigator will examine the efficacy of Pericapsular nerve group (PENG) block in hip arthroplasty as a post-operative pain management technique, study the analgesia, opioid-sparing effects and motor-blocking effects of the PENG block

PENG Block group (PG) will receive 0.5%Ropivacaine in 20 ml of saline. Sham Block group (SG) will receive 20 ml of saline Patient will be sedated with IV midazolam before nerve block. After peripheral nerve block ,general anesthesia will be conducted using sufentanyl, propofol and rocuronium for induction and propofol and sevoflurane for maintenance. Tests will be operated after procedure，and recorded up to 48 hours after surgery.

Inclusion Criteria:

• Patients scheduled for hip arthroplasty

Exclusion Criteria:

• allergy to local anesthetics
• infection at the injection site
• patients receiving opioids for chronic analgesic therapy
• other lower limb neuropathies
• inability to comprehend visual analog scale (VAS)
• preexist cognitive dysfunction