An optimized image matching method for determining in-vivo TKA kinematics with a dual-orthogonal fluoroscopic imaging system
An optimized image matching method for determining in-vivo TKA kinematics with a dual-orthogonal fluoroscopic imaging system
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DOI：
10.1115/1.2205865
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发表时间：
2006-08-01
影响因子：
1.7
通讯作者：
Li, Guoan
中科院分区：
文献类型：
--
作者：
Bingham, Jeffrey;Li, Guoan
本研究提出了一种优化的匹配算法，用于双正交透视图像系统，用于确定六自由度全膝关节置换术（TYA）的体内运动学。使用控制条件和标准几何对算法进行了评估。验证结果表明，该算法具有鲁棒性和从多种初始姿态实现一个姿态的能力。在理想条件下，TKA系统的位姿被重建到0.02 +/- 0.01 mm和0.02 +/- 0.03度的股骨部件和0.07 +/- 0.09 mm和0.16 +/- 0.18度的胫骨部件。通过采用球面标准几何，在实际条件下的平移精度和重复性为0.01±0.06 mm。将优化后的匹配算法应用于一例TKA患者，结果表明，TKA体内部件的位姿可以重复定位，股骨部件的位姿标准差小于+/- 0.12 mm和+/- 0.12°，胫骨部件的位姿标准差小于+/- 0.29 mm和+/- 0.25°。这种方法提供了一种有用的工具，可以很容易地应用于研究TKA运动学的体内运动。
This study presents an optimized matching algorithm for a dual-orthogonal fluoroscopic image system used to determine six degrees-of-freedom total knee arthroplasty (TYA) kinematics in-vivo. The algorithm was evaluated using controlled conditions and standard geometries. Results of the validation demonstrate the algorithm's robustness and capability of realizing-a pose from a variety of initial poses. Under idealized conditions, poses of a TKA system were recreated to within 0.02 +/- 0.01 mm and 0.02 +/- 0.03 deg for the femoral component and 0.07 +/- 0.09 mm and 0.16 +/- 0.18 deg for the tibial component. By employing a standardized geometry with spheres, the translational accuracy and repeatability under actual conditions was found to be 0.01 +/- 0.06 mm. Application of the optimized matching algorithm to a TKA patient showed that the pose of in-vivo TKA components can be repeatedly located, with standard deviations less than +/- 0.12 mm and +/- 0.12 deg for the femoral component and +/- 0.29 mm and +/- 0.25 deg for the tibial component. This methodology presents a useful tool that can be readily applied to the investigation of in-vivo motion of TKA kinematics.