Comput. Aided Surg. - Accuracy of angle and position of the cup using computed tomography-based navigation systems in total hip arthroplasty.

Tópicos

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Resumo

JECTIVE: The objectives of this study were to evaluate the accuracy of computed tomography (CT)-based navigation and to investigate whether the level of surgeon experience affects the accuracy of cup positioning under navigation.METHODS: This study investigated 117 hips in 103 patients who underwent primary total hip arthroplasty (THA) by 7 surgeons using a CT-based navigation system. Pre- and postoperative CT images were matched using a volume registration technique. Postoperative cup angles and positions were then measured using the same pelvic coordinates, and results were compared for experienced and inexperienced surgeons.RESULTS: The mean absolute error of the cup angle was 1.8 ? 1.6? for inclination and 1.2 ? 1.1? for anteversion. The mean absolute errors of cup position were 1.9 ? 1.5 mm, 1.4 ? 1.2 mm, and 1.9 ? 1.3 mm on the x-, y- and z-axes, respectively. No significant differences in accuracy were identified between experienced and inexperienced surgeons.CONCLUSIONS: The absolute spatial error of cup position was = 2 mm for each axis, and the angle error was = 2? for the angles of inclination and anteversion. This navigation system could therefore help surgeons perform accurate cup placement irrespective of the surgeon's level of experience.

Resumo Limpo

jectiv object studi evalu accuraci comput tomographi ctbase navig investig whether level surgeon experi affect accuraci cup posit navigationmethod studi investig hip patient underw primari total hip arthroplasti tha surgeon use ctbase navig system pre postop ct imag match use volum registr techniqu postop cup angl posit measur use pelvic coordin result compar experienc inexperienc surgeonsresult mean absolut error cup angl inclin antevers mean absolut error cup posit mm mm mm x y zax respect signific differ accuraci identifi experienc inexperienc surgeonsconclus absolut spatial error cup posit mm axi angl error angl inclin antevers navig system therefor help surgeon perform accur cup placement irrespect surgeon level experi

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