The goal of this intervention study is to compare the analgesic efficacy of pericapsular nerve group (PENG) block versus periarticular anesthetic infiltration (PAI) block in patients undergo hemiarthroplasty after spinal anesthesia . The main questions it aims to answer are: which block has more analgesic efficacy. which block has more motor-sparing analgesia. Researchers will compare optimal motor-sparing analgesia between PENG block and PAI after hemiarthroplasty. Participants will be divided in two groups : group receive PENG block and other group receive PAI
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the pain score (NRS)
Timeframe: at 12 hours after injection of local anethesia