Int J Med Robot - Anatomical comparison and evaluation of human proximal femurs modeling via different devices and FEM analysis.


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CKGROUND: Breuckmann optical scanning, Metris laser scanning and CT are general devices used for modeling hard or soft tissues in the biomedical field. Whereas the CT device is able to model internal and external structures of hard tissues, Breuckmann and Metris devices can only model the exterior portions of tissues. In this study, a human proximal femur was modeled using these devices, and the matching accuracy thereof is presented.METHODS: The human proximal femur was modeled by scanning with Breuckmann optical scanning, Metris laser scanning and CT devices. The 3D/3D registration method was performed in two ways: coordinate to coordinate based, and 2D contour based matching. Matching accuracies of the three models were developed with statistical deviation and local deviation. To determine the significance value between the deviations obtained, one way ANOVA, and for intragroup comparisons Tukey and Thamhane tests were used. After statistical analysis, stresses on the models were evaluated using ANSYS software taking boundary conditions on human standing position into consideration.RESULTS: In this study, the value of the 2D contour based accuracy deviation of the femur head zone between CT and Metris models was obtained as 0.4?0.2mm while it was 0.3?0.1mm between CT and Breuckmann. The highest matching deviation obtained as a result of the ANOVA test among these three models was found in the femur trochanter region (0.0142?0.0164mm), the lowest value was found in the femur head region (0.0070?0.0132mm). The stress of the CT-Breuckmann pair was found close to each other in stress analysis.CONCLUSION: The deviation values obtained by matching models created by three different methods showed statistically significant results (P<0.05). Values obtained from the CT-Breuckmann model were lower than those obtained from CT-Metris. In order to lower deviation values, applications such as increasing the resolution of images, using stronger algorithms, meshing methods and enhancing surface form should be implemented.

Resumo Limpo

ckground breuckmann optic scan metri laser scan ct general devic use model hard soft tissu biomed field wherea ct devic abl model intern extern structur hard tissu breuckmann metri devic can model exterior portion tissu studi human proxim femur model use devic match accuraci thereof presentedmethod human proxim femur model scan breuckmann optic scan metri laser scan ct devic dd registr method perform two way coordin coordin base d contour base match match accuraci three model develop statist deviat local deviat determin signific valu deviat obtain one way anova intragroup comparison tukey thamhan test use statist analysi stress model evalu use ansi softwar take boundari condit human stand posit considerationresult studi valu d contour base accuraci deviat femur head zone ct metri model obtain mm mm ct breuckmann highest match deviat obtain result anova test among three model found femur trochant region mm lowest valu found femur head region mm stress ctbreuckmann pair found close stress analysisconclus deviat valu obtain match model creat three differ method show statist signific result p valu obtain ctbreuckmann model lower obtain ctmetri order lower deviat valu applic increas resolut imag use stronger algorithm mesh method enhanc surfac form implement

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