The Reliability of the Tönnis Grading System in Patients Undergoing Hip Preservation. - Pullen, W. Michael; Carreira, Dominic S.; Wong, Ivan; Aoki, Stephen K.; Lynch, T. Sean; Mather III, Richard C.; Ayeni, Olufemi R.; Byrd, J.W. Thomas; Safran, Marc R. (American Journal of Sports Medicine, 2023)