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  • Title: Navigated non-image-based positioning of the acetabulum during total hip replacement.
    Author: Jenny JY, Boeri C, Dosch JC, Uscatu M, Ciobanu E.
    Journal: Int Orthop; 2009 Feb; 33(1):83-7. PubMed ID: 18004568.
    Abstract:
    We tested the hypothesis that the non-image-based navigation system used in our department was able to measure accurately the 3D positioning of the acetabular cup of a total hip replacement (THR) and to increase the accuracy of its implantation during THR. We studied 50 consecutive navigated implantations of a THR and compared the intra-operative measurement of the cup by the navigation system to the post-operative measurement by computed tomography (CT) scan. The mean difference between the navigated and CT scan measurements for cup inclination was 2 degrees . The mean difference between the navigated and CT-scan measurements for cup flexion was 4 degrees . These differences were significant but considered to be clinically irrelevant in most cases. A total of 73% of the cases were within the safe zone defined prior to the study. The non-image-based system used allows a precise orientation of the cup during THR. Le but de notre étude est de mettre en évidence la possibilité de positionner de façon précise, dans les trois plans de l’espace, la cupule d’une prothèse totale de hanche et d’améliorer ainsi son implantation. Nous avons étudié 50 prothèses consécutives naviguées en comparant la mesure per opératoire de la cupule par le système de navigation et la mesure post opératoire par scanner. La différence entre les mesures faites par navigation et les mesures par scanner ne montre au niveau de l’inclinaison de la cupule qu’une différence de 2° et pour la flexion de 4°. Ces différences sont significatives mais n’ont aucune conséquence clinique dans la plupart des cas. 73% des cupules étaient dans la zone de sécurité que nous avions définie avant de mettre en route cette étude. En conclusion, le système de navigation sans image permet une orientation précise de la cupule lors d’une prothèse totale de hanche.
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