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Hu Xin
Xi Juntong
Jin Ye
Institute of Computer Integrated
Manufacturing,
Shanghai Jiaotong University,
Shanghai 200030, China
Gu Dongyun
Dai Kerong
Department of Orthopaedics,
Shanghai 9th People’s Hospital,
Shanghai Second Medical University
Shanghai 200025, China |
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ANALYSIS AND RESEARCH OF
COMPUTER-AIDED MODEL OF
HIP JOINT BASED ON REVERSE
ENGINEERING*
Abstract: Former research work about the modeling of hip joint focus on the upper segment of femoral, and assumes the acetabulum cup is sphere concave, and the acetabulum prostheses is semisphere. A method of acquiring the point data on the surface of the hipbone using the reverse engineering technology is presented. After analyzing the acetabulum surface fitting error, a rotation ellipsoid CAD model is applied to fit the acetabulum surface, and then optimization technique is used to find the geometric parameters of the model. The fitting error between the sphere and rotation ellipsoid is compared and gets the result that the fitting error of rotation ellipsoid is smaller than sphere, and the rotation ellipsoid can describe the shape of the acetabulum better.
Key words:
Total hip joint replacement Reverse engineering Optimization method |