3D Simulation of Radiographic Projections to Test and Reduce the Effect of Pelvic Tilt on the Accuracy of Cross-table Lateral Radiography

Xu, Jie; Su, Baohua; Zhang, Wenhui; Sun, Hao; Deng, Li; Cai, Zhiqing; Chen, Meiyi; Qiu, Meiling; Ma, Ruofan

doi:10.21203/rs.3.rs-39670/v1

Cited by 1 publication

(3 citation statements)

References 22 publications

(33 reference statements)

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“…However, it was impractical to perform multiple lateral radiographs with different X-ray incidences in patients considering the radiation exposure and ethical issues. In a previous study, a THA postoperative 3D model was built, in which some parameters, including the cup version, inclination, pelvic tilt, and incidence, were independently adjusted [20]. Independent variables and confounding factors were controlled using the standard physical model.…”

Section: Methodsmentioning

confidence: 99%

“…One degree of PT changed anteversion by an average of 0.8° on the coronal plane [17]. A previous study found a similar effect of PT on cup version measurement on CL radiographs [20]. Moreover, the acetabular component version may change into or out of the conventionally de ned "safe zone" from the supine to the standing position [19].…”

Section: Introductionmentioning

confidence: 91%

“…Accordingly, the cup position assessed on supine CL radiograph seems not applicable to estimate the postoperative functional position of standing. Besides, the PT-relevant landmarks on CL radiograph are not clear, making a supplementary lateral lm essential to measure PT [20]. For AP radiographs, the change in PT can only be indirectly observed by the variation of the area of the obturators [21].…”

Section: Introductionmentioning

confidence: 99%

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A Study on the Reliability and Validity of the Standing Lateral Radiograph Method to Assess Acetabular Component Version

Zhang

Jun

Deng

et al. 2021

Preprint

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Objectives: Version of the acetabular component on standing position is an important factor influencing the risk of adverse outcomes during functional activities after total hip arthroplasty (THA). The main objective of this study was to evaluate the reliability and validity of a method for measuring cup version on standing lateral (SL) radiograph.Methods: 87 consecutive patients who underwent primary THA were included. SL radiograph and computed tomography (CT) scan were taken 7 days after THA to measure the cup version. The measurement method was based on the cross-table lateral (CL) radiograph. The tangential line of the cup opening face was determined through two intersecting points of the cup outer edge circle and the opening face elliptical arc. The version was measured between the horizonal line and the tangent line by two independent examiners. Radiographic measurements were compared with CT measurements after the uniformization of pelvic tilt (PT).Results: All measurements had excellent intra- and inter-observer reliabilities with an intraclass correlation coefficient (ICC) >0.90. The mean version was 15.56° (SD 11.22°, -19.82° to 38.74°) for SL radiographs and 16.19° (SD 12.09°, -23.00° to 47.20°) for PT-matched CT. There was a positive correlation (r = 0.901, p < 0.001) between radiographic versions and CT versions. The mean difference was -0.63° (SD 5.25°, -14.92° to 12.72°) and the differences were almost within the 95% limits of agreement. Conclusion: SL radiograph allows accurate and practicable evaluation of post-operative functional acetabular cup version, with an advantage to identify the pelvic tilt simultaneously.

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Section: Methodsmentioning

confidence: 99%