Article
CT Anteversion of the Acetabular Component after Total Hip Arthroplasty: Conventional Axial Versus Functional Coronal Plane
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Authors
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Kuen Tak Suh
- Pusan National University Yangsan Hospital, Yangsan, South Korea
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Won Chul Shin
- Pusan National University Yangsan Hospital, Yangsan, South Korea
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Jung Sub Lee
- Pusan National University Hospital, Busan, South Korea
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Nam Hoon Moon
- Pusan National University Hospital, Busan, South Korea
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Seung Min Son
- Pusan National University Yangsan Hospital, Yangsan, South Korea
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Min Uk Do
- Pusan National University Yangsan Hospital, Yangsan, South Korea
| Published: | October 22, 2019 |
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Outline
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Objectives: The present study intends to compare computed tomography (CT) anterversions of the acetabular components on conventional axial plane and functional coronal plane (FCP) from the perspective of radiographic anteversion.
Methods: We reviewed 50 patients (27 male and 23 female patients) who underwent primary unilateral total hip arthroplasty (THA) and postoperative CT scan from January to December 2015. The anteversion of the acetabular component was measured on conventional axial plane and reformatted FCP using CT scans. The values obtained using the PolyWare programme, which determines the anteversion of the acetabular component by edge detection, were regarded as the reference standard; validity was assessed by comparing radiographic measurements with the PolyWare programme.
Results and conclusion: Intra- and inter-observer reliabilities were excellent with all methods for measuring anteversion using CT image and the PolyWare programme. The mean anteversions using the PolyWare programme and the CT scans on conventional axial plane and FCT were 20.14°, 28.79°, and 20.61°, respectively. The anteversion using CT scans on FCP was similar to those obtained using the PolyWare programme, and was thus considered accurate (p = 0.347). However, values obtained from conventional axial plane significantly differed from those obtained using the PolyWare programme, and was thus considered less accurate (p = 0.001). The anteversion on conventional axial CT images was larger than those on FCP CT images on average. The two values showed a linear correlation and statistically significant. (r = 0.719, p < 0.001).
We found that the anteversion on conventional axial CT images, reflected anatomical anteversion, is always greater than the radiographic anteversion. When we evaluate the radiographic anteversion with CT images, measuring anteversion on FCP CT images is more accurate.
