2/8/2024 0 Comments Xray of normal hip replacement, and Woo and Morrey ) using the PolyWare programme in the same reference plane as the reference standard.Īll surgeries were performed by a single surgeon, who used a posterolateral approach, and included capsuloplasty. Therefore, we evaluated the reliability and accuracy of six widely utilized methods for measuring the anteversion of the acetabular component on plain radiographs (Liaw et al. To our knowledge, no study has evaluated the reliability and accuracy of the widely utilized radiographic anteversion measurement methods using the results from the PolyWare programme as the reference standard. Unlike those of CT, the results of the PolyWare programme represent radiographic anteversion and thus provide a better reference standard. Vevay, Indiana), accurately measures the anteversion of the acetabular component. Recent studies demonstrate that digital image analysis software using edge detection on plain radiographs, such as the PolyWare programme (Draftware Developers Inc. Therefore, on a theoretical basis, anteversion on CT cannot be used as the reference standard for assessment of radiographic anteversion measurements. However, anteversion on CT actually reflects anatomical anteversion, whereas anteversion on plain radiographs represents radiographic anteversion. Previous studies have compared the reliability and accuracy of these measurement methods to that using CT images. In addition, measurements of the anteversion from elliptical projection of the acetabular component on antero-posterior (AP) radiographs have been introduced in numerous reports. Although anteversion values vary significantly in serial cross-table lateral views, this method directly evaluates version, without complicated calculations, and allows anteversion and retroversion to be distinguished. The method described by Woo and Morrey has been widely used to measure the anteversion of the acetabular component on plain radiographs. As the anteversion is measured on different axes, depending on the method used, different values can result. Murray defined three types of anteversion of the acetabular component (anatomical, operative, and radiographic anteversion), each of which are measured on different images (computed tomography (CT), intraoperative assessments, and postoperative plain radiographs). Definition of anteversion differs, depending on various situations. There are several radiological methods for measuring the anteversion of the acetabular component after THA, and a single standardized method has not been established. Although the inclination of the acetabular component can be easily measured on plain radiographs, calculation of the anteversion is difficult. The orientation of the acetabular component comprises inclination and anteversion. Malposition of the acetabular component after total hip arthroplasty (THA) is related to dislocation of the prosthetic femoral head, increased polyethylene liner wear, and limited range of motion. is more accurate than other methods using plain radiographs for the measurement of the anteversion of the acetabular component after THA, with reference to the anteversion obtained from the PolyWare programme. However, values obtained using the other five methods significantly differed from those obtained using the PolyWare programme and were thus considered less accurate ( P < 0.001, P < 0.001, P < 0.001, P = 0.007, and P < 0.001, respectively). obtained values similar to those obtained using the PolyWare programme and was thus considered accurate ( P = 0.447). Intra- and inter-observer reliabilities were excellent for all methods using plain radiographs, including the PolyWare programme. The values obtained using the PolyWare programme, which determines the anteversion of the acetabular component by edge detection, were regarded as the reference standard. The anteversion of the acetabular component was measured on pelvis AP radiographs using five different methods (Liaw et al., Lewinnek et al., Widmer, Hassan et al., and Ackland et al.) and on cross-table lateral radiographs using the method of Woo and Morrey. We reviewed 71 patients who underwent primary unilateral THA. We evaluated the reliability and accuracy of six widely utilized methods (Liaw et al., Lewinnek et al., Widmer, Hassan et al., Ackland et al., and Woo and Morrey) for measuring anteversion on plain radiographs, using a reference standard in the same definition obtained from the PolyWare programme. Several radiological methods for measuring the anteversion of the acetabular component after total hip arthroplasty (THA) exist, and no single standardized method has been established.
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