Abstract:[Objective] To evaluate the clinical efficacy of hip arthroscopy for the treatment of femoroacetabular impingement (FAI) ac- companied with external snapping hip (ESH) . [Methods] A retrospective analysis was performed on the patients who received hip arthros- copy in our hospital from January 2014 to June 2019. Among them, 25 patients who suffered from FAI accompanied with ESH were termed as the trial group and underwent arthroscopic intraarticular lesion management and iliotibial band release, while the other 25 patients who had mere FAI were named as the control group and received arthroscopic treatment of FAI lesions only. The perioperative, follow-up and imaging data were compared between the two groups. [Results] All the patients in both groups had operation finished successfully with no serious complications. Although the trial group consumed significantly longer operation time than the control group (P<0.05) , there were no significant differences in total incision length, intraoperative X-ray exposure time, postoperative walking time, incision healing grade and hospital stay between the two groups (P>0.05) . The VAS scores significantly decreased (P<0.05) , whereas the mHHS score and iHOT-33 scores significantly increased in both groups at the latest follow-up lasted for more than 12 months compared with those preoperatively (P< 0.05) . In addition, the trial group got significant increase of hip adduction range of motion at straight leg, associated with that Ober signs be- came all negative at the latest interview (P<0.05) . The trial group was significantly inferior to the control group in terms of VAS score and iHOT-33 score preoperatively (P<0.05) , however which turned to be not statistically significant at the latest follow-up between them (P> 0.05) . Radiographically, the α angle and lateral center edge angle (LCEA) significantly reduced (P<0.05) , while the femoral head neck off-set (FHNO) significantly increased in both groups at the last follow- up compared with those before surgery (P<0.05) . At corresponding time points, there were no significant differences in aforesaid radiographic items between the two groups (P>0.05) . [Conclusion] Hip ar- throscopy for simultaneous treatment of FAI and ESH has the advantages of less trauma and simple operation, and does achieve clinical out- comes similar to those with FAI alone.