Recruitment and randomization
This study was registered in the Chinese Clinical Trial Registry (ChiCTR2100051521) and secured by the Ethics Committee of the First Affiliated Hospital of Chongqing Medical University on 6/16/2021. After signing the informed consent, a total of 92 patients undergoing elective one- sided THA were enrolled over a period of 9 months (11/10/2021 to 8/25/2022) (Fig. CONSORT diagram. PENG, pericapsular nerve group block; S-FICB, supra-inguinal fascia iliaca blockAll the subjects were randomly allocated to either the PENG + LFCN group or the S-FICB group in a 1:1 ratio using the random allocation scheme provided by RESEARCH-RANDOMIZE (