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Virtual reconstruction of unilateral pelvic fractures by using pelvic symmetry.
International Journal of Computer Assisted Radiology and Surgery ( IF 3 ) Pub Date : 2020-04-05 , DOI: 10.1007/s11548-020-02140-z
Maha S Ead 1 , Lindsey Westover 1 , Samantha Polege 1 , Sarah McClelland 1 , Jacob L Jaremko 2 , Kajsa K Duke 1
Affiliation  

Purpose

Pelvic fractures are known to be one of the most difficult injuries to treat. The objective of this study is to introduce a novel technique for virtual unilateral pelvic fracture reconstruction. Since the pelvis exhibits remarkable left–right symmetry, the contralateral hemipelvis can be used as a template for rebuilding the fractured hemipelvis.

Methods

CT scan data of the pelvic region of eight subjects with acute unilateral pelvic fractures were involved in this study. Computer-aided design software was used to create 3D models of these pelvises. The contralateral hemipelvis of each subject was then reflected across the sagittal plane, and the fractured hemipelvis was rebuilt by aligning the bone fragments with their equivalent location on the reflected side. To evaluate the quality of this reduction process, a 3D deviation analysis was conducted to calculate the differences between the reflected intact hemipelvis and the reconstructed hemipelvis.

Results

Results showed that the average root mean square (RMS) of deviations and average percentage of points within a ± 2 mm predefined threshold was 1.32 ± 0.22 mm and 88.4 ± 3.78%, respectively. The deviation color maps obtained indicated that the largest differences were along the fracture lines and on the non-articular surfaces of the pelvises.

Conclusion

These results allowed us to conclude the validity of this procedure, since the average RMS difference was below 2 mm and the average percentage of points within ± 2 mm was high. The proposed technique will allow surgeons to provide their patients with more accurate reconstruction procedures which can potentially improve surgical outcomes.



中文翻译:

使用骨盆对称性虚拟重建单侧骨盆骨折。

目的

骨盆骨折被认为是最难治疗的损伤之一。这项研究的目的是介绍一种虚拟单侧骨盆骨折重建的新技术。由于骨盆显示出明显的左右对称性,因此可以将对侧半骨盆用作重建骨折的半骨盆的模板。

方法

这项研究涉及八名患有急性单侧骨盆骨折的受试者的骨盆区域的CT扫描数据。使用计算机辅助设计软件来创建这些骨盆的3D模型。然后,将每个对象的对侧半骨盆在矢状面上反射,并通过将骨碎片与它们在反射侧的等效位置对齐来重建骨折的半骨盆。为了评估该还原过程的质量,进行了3​​D偏差分析,以计算反射的完整半盆和重建的半盆之间的差异。

结果

结果显示,在±2 mm的预定阈值内,偏差的平均均方根(RMS)和点的平均百分比分别为1.32±0.22 mm和88.4±3.78%。所获得的偏差颜色图表明,最大的差异是沿着骨折线和骨盆的非关节表面。

结论

这些结果使我们能够得出此程序的有效性,因为平均RMS差低于2 mm,并且±2 mm内的平均点百分比很高。所提出的技术将使外科医生能够为患者提供更准确的重建程序,从而有可能改善手术效果。

更新日期:2020-04-21
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