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Measuring acetabular dysplasia in plain radiographs

  • Orthopaedic Surgery
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Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

Abstract

Background

Several radiologic parameters have been used to qualify an acetabular coverage in studies determining whether an association exists between acetabular dysplasia and osteoarthritis of hip. However, it is not known which parameter is optimum for these epidemiologic studies. We evaluate the reliability, validity, and robustness of the radiologic parameters of acetabular coverage used in these studies.

Methods

Center-edge angle (CEA), acetabular depth (AD), acetabular angle (AA), acetabular roof obliquity (ARO), and roof angle (RA) were evaluated. The components of intra- and interobserver reliability were tested. The correlations between each parameter were used to depict convergent validity. The robustness of the parameters to different projection (urogram), different definitions of the lateral acetabular margin, and a differing pelvic tilt were evaluated.

Results

The intra- and interobserver reliabilities of CEA, AD and AA ranged from 0.777 to 0.925. The CEA, AD and AA showed acceptable validity in the correlation. The AD on the urograms was 22.0% higher than those on the standing hip radiographs (P < 0.001). When the osteophyte was included in the definition of lateral acetabular margin, the CEA and AD increased significantly (P < 0.001). In simulating pelvic tilting, the AD increased significantly with the anterior pelvic tilt (P < 0.001). The ARO and RA showed poor clinical relevance.

Conclusion

When measuring acetabular dysplasia, the AD is unsuitable for use, because it is not robust to different projection of beam and different pelvic tilts. Furthermore, one should consider that the CEA and AA are significantly influenced by different definitions of lateral acetabular margin.

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Acknowledgments

The authors wish to thank Mi Seon Ryu and Tae-Ki Kim for assistance in data collection.

Conflict of interest

No benefits in any form have been received or will be received from any commercial party related directly or indirectly to the subject of this article.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, 166 Gumi-ro, Bundang-Gu, Sungnam-si, Gyeonggi-do, 463-707, Korea

    Young-Kyun Lee, Chin Youb Chung, Kyung-Hoi Koo, Kyoung Min Lee, Dae Gyu Kwon & Moon Seok Park

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  1. Young-Kyun Lee
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Correspondence to Moon Seok Park.

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Lee, YK., Chung, C.Y., Koo, KH. et al. Measuring acetabular dysplasia in plain radiographs. Arch Orthop Trauma Surg 131, 1219–1226 (2011). https://doi.org/10.1007/s00402-011-1279-4

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