Matsuda DK, et al. - This study provides a description of observational findings of patients with acetabular dysplasia undergoing hip arthroscopy. According to findings, dysplasia, typically of borderline to mild severity, comprised a significant incidence of surgical cases (13%) by surgeons performing high-volume hip arthroscopy. Increased flexed-hip internal rotation may be seen in dysplasia patients, compared with patients without dysplasia, despite similar preoperative pain and functional profiles. Furthermore, significantly decreased internal rotation was attributed to commonly associated cam morphology. Most commonly performed procedures included arthroscopic labral repair, femoroplasty, and closure of interportal capsulotomy.