Abstract
We applied four published classifications for assessment of heterotopic ossification after total hip arthroplasty (Arcq, Brooker, DeLee and Della Valle [1, 2, 5, 6]. The average incidence of heterotopic ossification varied from 19.8% to 27.7%. The inter-observer reliability of the various classifications was determined by Cohen’s Kappa statistic. Kappa values ranged from 0.897 for Arcq’s to 0.814 for Brooker’s classification. In order to increase the reliability and consistency, we propose a new classification system combining Brooker’s and Della Valle’s classifications. This new classification preserves the high reliability of Della Valle’s system and is comparable to previous publications since it includes Brooker’s criteria.
Résumé
Nous avons utilisé quatre classifications publiées pour l’estimation des ossifications hétérotopiques après arthroplastie total de la hanche (Arcq, Brooker, DeLee and Della Valle [1, 2, 5, 6]. La fréquence moyenne de ces ossifications variait de 19,8 à 27,7%. La précision inter-observateurs des classifications a été déterminée par le kappa statistique de Cohen. Les valeurs Kappa ont varié de 0.897 pour Arcq à 0.814 pours la classification de Brooker. Pour augmenter la précision et la cohérence, nous proposons un nouveau système qui combine les classifications de Brooker et de Della Valles. Cette nouvelle classification conserve la haute précision du système de Della Valle et est comparable aux publications antérieures puisque elle inclut les critères de Brooker.
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Acknowledgements
This work was supported by grants from the Estonian Science Foundation: no. 5210 and no. 5445, and the Swedish Institute (01829).
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Toom, A., Fischer, K., Märtson, A. et al. Inter-observer reliability in the assessment of heterotopic ossification: proposal of a combined classification. International Orthopaedics (SICOT) 29, 156–159 (2005). https://doi.org/10.1007/s00264-004-0603-9
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DOI: https://doi.org/10.1007/s00264-004-0603-9