The Accuracy of a Mechanical Cup Alignment Guide in Total Hip Arthroplasty (THA) Through Direct Anterior and Posterior Approaches Measured with CT-Based Navigation

• Published in: The Journal of arthroplasty Vol. 30; no. 9; pp. 1561 - 1564
• Main Authors: Maeda, Yuki, MD, PhD, Sugano, Nobuhiko, MD, PhD, Nakamura, Nobuo, MD, PhD, Hamawaki, Makoto, MD
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.09.2015
• Subjects: Adult; Aged; Aged, 80 and over; Arthroplasty, Replacement, Hip - methods; CT-based navigation; cup alignment; Female; Hip Prosthesis; Humans; Male; mechanical cup alignment guide; Middle Aged; Orthopedics; Patient Positioning; Reproducibility of Results; Surgery, Computer-Assisted; surgical approach; surgical position; Tomography, X-Ray Computed; total hip arthroplasty; mechanical cup alignment guide; total hip arthroplasty; cup alignment; surgical position; CT-based navigation; surgical approach
• ISSN: 0883-5403; 1532-8406
• DOI: 10.1016/j.arth.2015.04.011

Abstract 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.