Bayraktar, Vahdettin and Weber, Markus and von Kunow, Frederik and Zeman, Florian and Craiovan, Benjamin and Renkawitz, Tobias and Grifka, Joachim and Woerner, Michael (2017) Accuracy of measuring acetabular cup position after total hip arthroplasty: comparison between a radiographic planning software and three-dimensional computed tomography. INTERNATIONAL ORTHOPAEDICS, 41 (4). pp. 731-738. ISSN 0341-2695, 1432-5195
Full text not available from this repository. (Request a copy)Abstract
Purpose Various methods are available for measuring acetabular cup position after total hip arthroplasty (THA) on standard anterior-posterior (AP) radiographs. We compared the accuracy of a commercial radiographic planning software program with that of three-dimensional computed tomography (3D-CT) scans. Methods We obtained plain AP radiographs and 3D-CTs from 65 patients after THA. In addition to calculating cup anteversion and inclination with 3D-CT, we determined the cup position using the radiographic planning software program mediCAD (R) 2.5 (Hectec, Niederviehbach, Germany). Furthermore, we compared the measurements using the inter-teardrop and bi-ischial lines as pelvic landmarks. Results The mean difference in anteversion between 3D-CT and mediCAD (R) software was 0.1 degrees using the inter-teardrop line (standard deviation [SD], 8.8 degrees; range, -21 degrees to 23 degrees; p = 0.97) and 0.4 degrees using the bi-ischial line (SD, 8.8 degrees; range, -23 degrees to 21 degrees; p = 0.72). Inclination showed a mean difference of 0.6 degrees using the inter-teardrop line (SD, 4.4 degrees; range, -9 degrees to 21 degrees; p = 0.24) and 0.5 degrees using bi-ischial line (SD, 4.6 degrees; range, -9 degrees to 22 degrees; p = 0.35). The means for absolute differences were 7.2 degrees for anteversion and 3.1 degrees for inclination. With regard to using the bi-ischial or inter-teardrop line, no significant difference was found between the two pelvic landmarks. The intra-class correlation coefficient (ICC) was analysed for anteversion and inclination using either the inter-teardrop line or the bi-ischial line as radiographic baseline. Conclusions A radiographic planning software program (mediCAD (R)) is a helpful tool for measuring cup inclination on AP radiographs. With respect to anteversion, measurements are rather susceptible to mistakes with mean inaccuracies of over 7 degrees. Thus, 3D-CT remains the "gold standard" if a lower tolerance limit (+/- 3 degrees) is required for more complex biomechanical evaluations. As a pelvic landmark, the interteardrop line is preferential to the bi-ischial line because of its lower impact on the position of the pelvis.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | COMPONENT POSITION; ORIENTATION; REPLACEMENT; ANTEVERSION; NAVIGATION; SYSTEM; RELIABILITY; VALIDATION; MODEL; TILT; Acetabular cup orientation; 3D-CT; Radiographic software; Total hip arthroplasty; Anteversion; Inclination; Pelvic landmark |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Orthopädie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:11 |
| Last Modified: | 18 Feb 2019 14:28 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1140 |
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