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Total Hip Arthroplasty Using Socket Positioning System(Socket Alignment Guide) Satoru Yano 1,2 , Masahiro Yamada 1 , Tomoya Hakogi 1 , Tetsuo Nakazima 1 , Toshiaki Hitora 1 1Department of Orthopaedic Surgery,Kasai Municipal Hospital Keyword: total hip arthroplasty(人工股関節置換術) , socket alignment guide(臼蓋ソケットガイド) , marking(マーキング) pp.231-242
Published Date 2006/3/1
DOI https://doi.org/10.11477/mf.1408100265
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Recently,total hip replacement is usually performed with the patient in a lateral position. During surgery,the pelvis often becomes tilted. However,the surgeons cannot accurately track any change in position. Significant tilting of the pelvis can lead to malpositioning of the acetabular component,which increases the risk of dislocation. Several marking methods have been developed to help surgeons account for the orientation of the pelvis. However,marker is nomally fixed to the pelvis without accurately determing the alignment of the pelvis. As a result,the direction of the marker is not reliable. We have developed a socket positioning system. The patient is laid in a spine position on a horizontal base-board,and the pelvis is fixed using a frame. By noting the fiducial metalic landmark,which is fixed near the acetabulum percutaneously parallel with the interteardrop line of the pelvis,the alignment guide can be assembled intraoperatively. The goal of the alignment was to place the acetabular cup at 45 degrees abduction and 20 degrees anteversion using an operative definition(46.7 degrees abduction and 13.9 degrees anteversion using a roentgenological definition). In our study,the average abduction angle was 47.2±3.7 degrees,and the average anteversion angle was 13.3±5.8 degrees using a roentgenological definition.


Copyright © 2006, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1286 印刷版ISSN 0557-0433 医学書院

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