Yuya Kawarai1,2, Satoshi Iida3, Junichi Nakamura4, Yoshiyuki Shinada3, Chiho Suzuki3, Seiji Ohtori4. 1. Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba City, Chiba, 260-8677, Japan. yuyayuyayuuya@gmail.com. 2. Department of Orthopaedic Surgery, Matsudo City Hospital , 4005 Kamihongou, Matsud City, Chiba, 271-8511, Japan. yuyayuyayuuya@gmail.com. 3. Department of Orthopaedic Surgery, Matsudo City Hospital , 4005 Kamihongou, Matsud City, Chiba, 271-8511, Japan. 4. Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba City, Chiba, 260-8677, Japan.
Abstract
PURPOSE: The purpose of this study was to clarify the difference in implant alignment between the direct anterior approach (DAA) and the anterolateral approach in the supine position (ALS). METHODS: A retrospective comparative study consisted of 215 consecutive primary total hip arthroplasties using tapered polished and straight cemented-stems via two different minimally invasive approaches (DAA group in 106 hips and ALS group in 109 hips). RESULTS: The cup radiographic anteversion angle was significantly lower in the ALS group than in the DAA group (12.9° versus 16.9°, p = 0.001). The frequency of the safe zone tended to be more favourable in the ALS group than in the DAA group (95% versus 87%, p = 0.052). Stem alignment in the sagittal plane was significantly better in the ALS group than in the DAA group (84% versus 71%, p = 0.022). CONCLUSIONS: Both cup and stem alignments were better in the ALS group than the DAA group.
PURPOSE: The purpose of this study was to clarify the difference in implant alignment between the direct anterior approach (DAA) and the anterolateral approach in the supine position (ALS). METHODS: A retrospective comparative study consisted of 215 consecutive primary total hip arthroplasties using tapered polished and straight cemented-stems via two different minimally invasive approaches (DAA group in 106 hips and ALS group in 109 hips). RESULTS: The cup radiographic anteversion angle was significantly lower in the ALS group than in the DAA group (12.9° versus 16.9°, p = 0.001). The frequency of the safe zone tended to be more favourable in the ALS group than in the DAA group (95% versus 87%, p = 0.052). Stem alignment in the sagittal plane was significantly better in the ALS group than in the DAA group (84% versus 71%, p = 0.022). CONCLUSIONS: Both cup and stem alignments were better in the ALS group than the DAA group.
Entities:
Keywords:
Anterolateral approach in the supine position; Cemented total hip arthroplasty; Direct anterior approach; Implant alignment; Minimally invasive surgery
Authors: José A Rodriguez; Ajit J Deshmukh; Parthiv A Rathod; Michelle L Greiz; Prashant P Deshmane; Matthew S Hepinstall; Amar S Ranawat Journal: Clin Orthop Relat Res Date: 2014-02 Impact factor: 4.176