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Title: 3D geometrical assessment of femoral curvature: A reverse engineering technique
Authors: Nattapon Chantarapanich
Kriskrai Sitthiseripratip
Banchong Mahaisavariya
Marut Wongcumchang
Pongwit Siribodhi
Kasetsart University
The National Metal and Materials Technology Center (MTEC)
Mahidol University
Keywords: Medicine
Issue Date: 1-Sep-2008
Citation: Journal of the Medical Association of Thailand. Vol.91, No.9 (2008), 1377-1381
Abstract: Objective: Investigate the 2D/3D geometry of femoral curvature and femoral length using the advanced technique of computerized tomography combined with reverse engineering techniques. Material and Method: The present study was performed using reverse engineering technique based on CT data of 99 cadaveric femora. The femur was divided into three segments, proximal, mid-shaft, and distal regions by defining 35% and 65% of the femoral total length as a boundary of each region. The intramedullary canal in the mid-shaft region was mainly extracted to determine the set of circular center, which could consequence to approximate the 3D femoral radius of curvature using the 3D least square best fit. The 3D femoral curvature was then projected into A-P and M-L directions to investigate the correlation of 2D/3D femoral curvature as normal radiographic images. Results: It was found that the average 3D Thai femoral curvature was 895.46-mm (SD = 238.06) and the average femoral total length is 421.96-mm (SD = 27.61). In addition, the 2D femoral curvature derived from sagittal radiographic image can be used to determine the 3D femoral curvature with this equation: R3D = RSagtital + 3.67 with r = 0.987. Conclusion: This described technique is a non-destructive method that can effectively assess the internal/external 3D geometric data of the femur. The obtained data is useful to develop a proper design of prosthesis that required inserting into the intramedullary canal. From the present study, it can be concluded that the 2DSagtital femoral curvature derived from standard radiographic image can be represented for the 3D femoral curvature.
ISSN: 01252208
Appears in Collections:Scopus 2006-2010

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