Editorial Commentary: Tönnis Classification-Beauty (or Hip Arthritis) Is Truly in the Eye of the Beholder.

Abstract

The radiography-based Tönnis classification and magnetic resonance imaging-based International Cartilage Repair Society classification are frequently used to predict articular damage to the hip joint before hip arthroscopy. Despite the ubiquity of these modalities, they both have significant limitations. In particular, the intraobserver reliability and interobserver reliability are less than good. As such, they should be used in conjunction with all other information, most importantly surgical findings, as the basis for treatment decisions.