The Accuracy of a Mechanical Cup Alignment Guide in Total Hip Arthroplasty (THA) Through Direct Anterior and Posterior Approaches Measured with CT-Based Navigation.
The purpose of this study was to compare the accuracy of a mechanical cup alignment guide using CT-based navigation between a direct anterior approach (DAA) in both supine and lateral positions and a posterior approach (PA) in the lateral position. A trial cup was placed with a mechanical guide that aimed at 47° of radiographic inclination and 14° of anteversion. The average cup inclination and anteversion were measured using CT-based navigation. The average radiographic anteversion in the DAA supine and lateral group was larger, and that in the PA group was smaller than the target angle. In conclusion, there are no differences in the accuracy or precision of cup angles among the DAA supine, DAA lateral position, and PA groups using a mechanical guide.
Center of Arthroplasty, Kyowakai Hospital, Suita city, Osaka, Japan.
Yuki
Y
Maeda
Department of Orthopaedic Medical Engineering, Osaka University Graduate School of Medicine, Suita city, Osaka, Japan.
Nobuhiko
N
Sugano
Center of Arthroplasty, Kyowakai Hospital, Suita city, Osaka, Japan.
Nobuo
N
Nakamura
Center of Arthroplasty, Kyowakai Hospital, Suita city, Osaka, Japan.
Makoto
M
Hamawaki
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D056888:Patient Positioning; D015203:Reproducibility of Results; D025321:Surgery, Computer-Assisted; D014057:Tomography, X-Ray Computed
CT-based navigation; cup alignment; mechanical cup alignment guide; surgical approach; surgical position; total hip arthroplasty