Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (35): 6639-6642.doi: 10.3969/j.issn.1673-8225.2010.35.045

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Computer-assisted design of individualized femoral prosthesis according to 3D reconstruction of CT images

Zhu Jian-wei1, Liu Fan1, Dong Qi-rong2, Xu Wei-wei3, Bai En-zhong4, Huang Xi5   

  1. 1 Department of Orthopedics, Affiliated Hospital of Nantong University, Nantong  226001, Jiangsu Province, China; 2 Department of Orthopedics, Second Hospital of Soochow University, Suzhou  215004, Jiangsu Province, China; 3 Nantong Hongqiao Hospital, Nantong  226001, Jiangsu Province, China; 4 Department of Orthopedics, Feicheng Hospital of Traditional Chinese Medicine, Feicheng  271600, Shandong Province, China; 5 College of Mechanical Engineering, Nantong University, Nantong  226001, Jiangsu Province, China
  • Online:2010-08-27 Published:2010-08-27
  • About author:Zhu Jian-wei☆, Doctor, Associate professor, Associate chief physician, Department of Orthopedics, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, China zhujianweint@126.com
  • Supported by:

    the Social Development Science and Technology Program of Nantong City, No. S2007043*; a grant of Talent Introduction Foundation of Nantong University, No. 08R15*; the Natural Science Foundation Program of Nantong University, No. 07Z097*

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Abstract:

BACKGROUND: Due to individual characteristics of human body, it is difficult to well match between standard prosthesis and patient skeleton. Computer-assisted design and manufacture of individualized prosthesis can effectively prolong artificial joint lifespan and quality and reduce revision rate. However, related studies are few in China.
OBJECTIVE: To explore computer-assisted design for individualized femoral head prosthesis according to three-dimensional (3D) reconstruction of CT images for improving prosthesis and affected skeleton matching.
METHODS: The CT scanning image of one healthy male volunteer, with no hip joint disease, was used. His femur was scanned with GE Speed Light CT with 3.0 mm thick cross-section slices. CT 2D images were transmitted to a computer. The medical image format was translated from DICOM into bmp. Inner and external bone contours were drawn automatically or by hand and processed digitally, and then these data were downloaded into 3D Mimics8.1, and Rapidform2004 software. The 3D femoral canal model was rendered. Femur canal contours curve was downloaded into the Solidworks2004 software in the form of dxf. Femoral prosthesis was designed on the base of femoral canal contours curve.
RESULTS AND CONCLUSION: The CT image was transmitted in the form of vector by a set of self-made medical image processing software. The accurate 3D femoral internal/external outline model was obtained by CT 2D image and reverse technique. Suitable femoral prosthesis was designed by means of image reverse engineering and norientation CAD. Reverse engineering and CAD provide an effective way to develop individualized prosthesis, improve the matching of prosthesis and affected skeleton, prevent prosthesis loosening and improve long-term stability.

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