Binary Tönnis Classification: Simplified Modification Demonstrates Better Inter- and Intra-Observer Reliability as Well as Agreement in Surgical Management of Hip Pathology

Binary Tönnis Classification: Simplified Modification Demonstrates Better Inter- and Intra-Observer Reliability as Well as Agreement in Surgical Management of Hip Pathology

Authors: Shapira J, Chen JW, Bheem R, Rosinsky PJ, Maldonado DR, Lall AC, Domb BG

DOI: 10.1186/s12891-020-03520-x

Background

The traditional Tönnis classification for hip osteoarthritis has limitations in reliability. This study evaluates a simplified binary modification for improved consistency.

Methods

Radiographs from 50 hip OA patients were assessed by five surgeons using both traditional and binary Tönnis classifications to compare inter- and intra-observer reliability.

Key Findings

• The binary Tönnis classification demonstrated superior reliability and consistency.
• It was easier to use and better correlated with surgical decision-making.

Conclusions

The binary system is a more practical and reproducible tool for grading hip OA severity, enhancing clinical communication and treatment planning.

What Does This Mean for Providers?

Adopting the binary Tönnis classification may improve diagnostic consistency and guide more reliable surgical decision-making in hip osteoarthritis management. This can facilitate clearer patient discussions and streamline treatment protocols.