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首页> 外文期刊>Journal of Biomechanics >A new model-based RSA method validated using CAD models and models from reversed engineering.
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A new model-based RSA method validated using CAD models and models from reversed engineering.

机译：一种新的基于模型的RSA方法已使用CAD模型和逆向工程模型进行了验证。

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摘要

Roentgen stereophotogrammetric analysis (RSA) was developed to measure micromotion of an orthopaedic implant with respect to its surrounding bone. A disadvantage of conventional RSA is that it requires the implant to be marked with tantalum beads. This disadvantage can potentially be resolved with model-based RSA, whereby a 3D model of the implant is used for matching with the actual images and the assessment of position and rotation of the implant. In this study, a model-based RSA algorithm is presented and validated in phantom experiments. To investigate the influence of the accuracy of the implant models that were used for model-based RSA, we studied both computer aided design (CAD) models as well as models obtained by means of reversed engineering (RE) of the actual implant.The results demonstrate that the RE models provide more accurate results than the CAD models. If these RE models are derived from the very same implant, it is possible to achieve a maximum standard deviation of the error in the migration calculation of 0.06mm for translations in x- and y-direction and 0.14mm for the out of plane z-direction, respectively. For rotations about the y-axis, the standard deviation was about 0.1 degrees and for rotations about the x- and z-axis 0.05 degrees. Studies with clinical RSA-radiographs must prove that these results can also be reached in a clinical setting, making model-based RSA a possible alternative for marker-based RSA.
机译：进行了伦琴立体摄影测量分析（RSA），以测量整形外科植入物相对于其周围骨骼的微动。传统RSA的缺点是它要求植入物上标有钽珠。利用基于模型的RSA可以解决该缺点，从而将植入物的3D模型用于与实际图像进行匹配以及评估植入物的位置和旋转。在这项研究中，提出了一种基于模型的RSA算法，并在幻像实验中对其进行了验证。为了研究用于基于模型的RSA的植入物模型准确性的影响，我们研究了计算机辅助设计（CAD）模型以及通过实际植入物的逆向工程（RE）获得的模型。证明RE模型比CAD模型提供更准确的结果。如果这些RE模型源自完全相同的植入物，则在x和y方向上的平移以及在平面z-之外的平移0.14mm时，可以在迁移计算中实现误差的最大标准偏差为0.06mm。方向。对于绕y轴的旋转，标准偏差约为0.1度，而绕x和z轴的旋转的标准偏差为0.05度。临床RSA射线照相仪的研究必须证明，在临床环境中也可以达到这些结果，从而使基于模型的RSA成为基于标记的RSA的可能替代方案。

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