Abstract: Objective To evaluate the clinical efficacy and influencing factors of revision hip arthroscopy in patients with femoroacetabular impingement syndrome (FAIS). Methods A retrospective analysis was conducted on 40 patients (41 hips) admitted to our hospital for revision hip arthroscopy between October 2011 and October 2020.Demographic characteristics,surgical procedures,preoperative and postoperative imaging,and functional scores were recorded.Statistical analysis was performed using SPSS 27.0.Compare the Visual Analog Scale (VAS) scores and modified Harris Hip Score (mHHS) before and after the operation.Spearman correlation analysis was performed to explore potential factors influencing postoperative outcome improvements. Results The mean follow-up period was 4.1 years.The VAS score decreased from 6 (2~9) preoperatively to 2 (0~8) at the final follow-up (P<0.05).The mean mHHS increased from (55.4±11.2) points before the operation to (72.0±16.9) points at the last follow-up (P<0.05).No patients underwent a second revision arthroscopic surgery or total hip arthroplasty.The improvement of VAS score was significantly negatively associated with the Tnnis grade (r=-0.430,P=0.005). Conclusion Residual FAIS and labral lesions are main causes of revision surgery.Revision hip arthroscopy can significantly improve clinical symptoms and hip function.The degree of degenerative changes is an important factor influencing prognosis.

Key words: femoroacetabular impingement syndrome, revision hip arthroscopy, hip preservation, clinical outcomes, influencing factors