Accuracy of angle and position of the cup using computed tomography-based navigation systems in total hip arthroplasty. (17th July 2013)

• Record Type: Journal Article
• Authors: Iwana, Daiki; Nakamura, Nobuo; Miki, Hidenobu; Kitada, Makoto; Hananouchi, Takehito; Sugano, Nobuhiko
• Is Part Of: Computer aided surgery. Volume 18:Number 5/6(2013:Sep./Nov.)
• Page Start: 187
• Page End: 194
• Publication Date: 2013-07-17
• Subjects: Accuracy -- CT-based navigation system -- surgeon experience -- total hip arthroplasty; Computer-assisted surgery -- Periodicals; Imaging systems in medicine -- Periodicals; Surgery, Operative -- Computer simulation -- Periodicals; Surgical technology -- Periodicals; Medical technology -- Periodicals; 617.90285
• DOI: 10.3109/10929088.2013.818713
• Languages: English
• ISSNs: 1092-9088

Abstract

Abstract: Objective : 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.