Abstract
The aim of this study was to evaluate in vivo stability for mediolateral laxity in extension and anteroposterior laxity in 90° of flexion and to correlate these and the range of motion (ROM) in 42 total knee arthroplasties (TKA) performed using a navigation system, with a minimum 1-year follow-up. The following parameters were measured at the final follow-up: mediolateral laxity in extension and anteroposterior laxity in 90° of flexion as determined by stress radiographs and a Telos arthrometer, modified HSS scores (excluding laxity and range of motion) and the range of motion (ROM). The mean modified HSS score was 82% of 82 maximum allowable points, and the mean postoperative ROM was 128.1±10.4°. Mean medial laxity was 3.5±1.4°, mean lateral laxity was 4.4±2.2° and mean anteroposterior laxity was 7.1±4.1 mm. We found no significant correlation between mediolateral laxity and postoperative ROM. However, a significant correlation was found between postoperative ROM and anteroposterior laxity. In conclusion, the use of a navigation system in TKA assists the surgeon to achieve good in vivo stability. Short-term clinical results are promising.
Résumé
Le but de cette étude est d’évaluer la stabilité latérale en extension et la stabilité antéropostérieure en flexion à 90° des PTG en corrélation avec le degré de mobilité sur 42 genoux mis en place en utilisant un système de navigation, avec un minimum de suivi d’un an. La laxité médio-latérale en extension, la laxité antéropostérieure en flexion à 90° ont été évaluées en utilisant des radiographies en stress (arthromètre Télos), a également été utilisé le score HSS et l’évaluation du degré de flexion du genou au dernier recul. Le score HSS était dans plus de 82% des cas supérieur à 82 points avec une flexion moyenne du genou de 128,1±10,4°. La laxité interne de la mesure a été de 3,5±1,4°, la laxité externe de 4,4±2,2° et la laxité antéropostérieure de 7,1±4,1 mm. Nous n’avons pas trouvé de corrélation significative entre la laxité latérale et le degré de flexion du genou. Cependant nous avons retrouvé une corrélation significative entre le degré de flexion du genou et la laxité antéropostérieure alors qu’il n’y avait pas de corrélation entre laxité médio-latérale et la mobilité. En conclusion, l’utilisation d’un système de navigation dans la mise en place d’une prothèse totale du genou est une aide certaine pour obtenir une meilleure stabilité et des résultats à court terme prometteurs.
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Seon, J.K., Song, E.K., Yoon, T.R. et al. In vivo stability of total knee arthroplasty using a navigation system. International Orthopaedics (SICO 31, 45–48 (2007). https://doi.org/10.1007/s00264-006-0139-2
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DOI: https://doi.org/10.1007/s00264-006-0139-2