The Reliability of the Tönnis Grading System in Patients Undergoing Hip Preservation.
W Michael PullenDominic S CarreiraIvan WongStephen K AokiT Sean LynchRichard C MatherOlufemi R AyeniJ W Thomas ByrdMarc R SafranPublished in: The American journal of sports medicine (2023)
Interobserver and intraobserver reliabilities were fair and moderate, respectively, for grading OA. Given the limited interobserver reliability, caution should be used when interpreting and translating studies that utilize the Tönnis grade or other rating to dictate treatment algorithms.