Error analysis of a computer-assisted orthopedic system for distal locking of intramedullary nail
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摘要: 针对长骨骨折手术,介绍了一种基于图像导引的计算机辅助骨外科手术系统,用于解决因髓内钉在植入骨髓腔过程中变形而造成的锁钉困难问题.在分析系统结构及数学模型特点的基础上,设计了一种误差分析方法来评定该系统的误差分布;引入蒙特卡罗方法具体完成了误差计算与统计,并给出了系统误差的来源分布特点;完成了系统性能的评估,为进一步优化和增强系统功能提供了理论依据.该分析方法能够为具有复杂数学模型的同类系统的设计提供一定的参考.Abstract: To solve the distal locking difficulty arising from the bending and twisting of the intramedullary nail axis while the nail implanting in long bone fracture therapy, an image-guided computer-assisted orthopaedic surgery system was introduced. To evaluate the error distribution of the system, a special error analysis method was designed based on the character of the system structure and its geometric model. The concrete calculation and statistics of error distribution were embodied with the assistance of the Monte-Carlo method. The system performance was also evaluated in order to derive the theoretic guarantees for further optimizing the system. The idea of this error analysis method can be used for the similar systems with complicated mathematical models.
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Key words:
- computer vision /
- Monte-Carlo method /
- computer-assisted surgery /
- intramedullary nail
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