A novel computer-based method for measuring the acetabular angle on hip radiographs

Abstract

Objective: The aim of this study was to propose a new computer based method for measuring acetabularangles on hip radiographs and to assess its practicality, sensitivity and reliability for acetabular anglemeasurement.Methods: A total of 314 acetabulum were assessed on 157 pelvic X-ray images. Acetabular angles weremeasured with both the conventional method (Method 1) and our proposed method (Method 2). All theAcetabular Index (AI) angle, Acetabular Angle (AA) and Acetabular Center (ACM) angle were measuredwith both methods.Results: The mean AI angle for Method 1 is 11.02± 2.7and the mean AI angle for Method 2 is10.08± 1.88, the mean AA angle for Method 1 is 39.5± 5.3and the mean AA angle for Method 2 is39.36± 4.68, the mean ACM angle for Method 1 is 50.5± 6.01and the mean ACM angle for Method 2is 55.42± 12.43.Conclusion: Our novel automated method appear to be reliable and practical for acetabular anglemeasurement on hip radiographs.Level of Evidence: Level III, Diagnostic study© 2017 Turkish Association of Orthopaedics and Traumatology. Publishing services by Elsevier B.V. This isan open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).