Arthroscopic surgery for femoroacetabular impingement has limited effect in patients with Tönnis grade-2 at 4-year follow-up

This study evaluated intraoperative findings and outcomes in Tönnis grade-2 patients after hip arthroscopy and compared these results with patients with Tönnis grade-0 and grade-1.Retrospective cohort study of patients undergoing hip arthroscopy between January 2013 and December 2017. Patients were divided into either Tönnis grade-2, grade-1, and grade-0 osteoarthritis groups. Labral and chondral status were evaluated. Radiographic analysis,...