中国组织工程研究 ›› 2019, Vol. 23 ›› Issue (32): 5085-5091.doi: 10.3969/j.issn.2095-4344.1480

• 人工假体 artificial prosthesis •    下一篇

陶瓷髋关节股骨头直径尺寸与动态微分离条件下边缘负载的关系

廉  超,张茂荣,王俊元,成  博,刘  峰   

  1. 中北大学机械工程学院,山西省太原市  030051
  • 出版日期:2019-11-18 发布日期:2019-11-18
  • 通讯作者: 刘峰,教授,中北大学机械工程学院,山西省太原市 030051
  • 作者简介:廉超,男,1994年生,山西省孝义市人,汉族,中北大学在读硕士,主要从事生物力学和人工关节方面的研究。
  • 基金资助:

    国家自然科学基金(21604074),项目负责人:成博

Relationship between femoral head diameter and edge load under dynamic micro-separation of ceramic hip joints

Lian Chao, Zhang Maorong, Wang Junyuan, Cheng Bo, Liu Feng   

  1. School of Mechanical Engineering, North University of China, Taiyuan 030051, Shanxi Province, China
  • Online:2019-11-18 Published:2019-11-18
  • Contact: Liu Feng, Professor, School of Mechanical Engineering, North University of China, Taiyuan 030051, Shanxi Province, China
  • About author:Lian Chao, Master candidate, School of Mechanical Engineering, North University of China, Taiyuan 030051, Shanxi Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 21604074 (to CB)

摘要:

文章快速阅读:

文题释义:
初始分离距离:在进行髋关节置换手术时,在假体安装过程中,由于医师的操作误差,股骨头与髋臼杯没能同心安装,使得股骨头心与臼杯旋转中心在冠状面内产生了沿内、外侧方向的分离距离,这个分离距离被称为初始分离距离,通常情况下,将<1 mm的初始分离距离称之为微分离。
体积磨损度量指数:两物体之间的磨损程度与接触力和滑动距离有关,而滑动距离则与发生接触的时间有关,可以进行一个概念的置换,利用Adams输出的接触力与时间曲线图,计算发生边缘接触的这段时间内,每一个时间点与其所对应接触力的乘积之和,其结果可以称为髋关节假体体积磨损度量指数,用以侧面印证实际磨损情况。
 
摘要
背景:建立人工髋关节动力学仿真模型能有效模拟人体髋关节股骨头与臼杯动态分离过程,并探究股骨头与臼杯分离条件下的边缘接触现象。
目的:研究人工髋关节股骨头假体直径尺寸对髋关节动态微分离下边缘负载的影响,为陶瓷髋关节因边缘负载产生的早期高磨损问题提供生物力学分析基础,也为髋关节假体设计和临床应用提供理论依据。
方法:利用前期已经验证过的仿真模拟方法,即基于Adams动力学仿真软件的人工髋关节边缘接触的动力学模型,模拟髋关节在步态周期内发生动态微分离和边缘接触的现象。
结果与结论:①髋关节臼杯与股骨头动态微分离产生边缘负载的最大接触力值随股骨头尺寸增大而小幅减小;②髋关节假体体积磨损度量指数,即边缘接触力与其作用时间的乘积,随股骨头尺寸增大而增大,直径36 mm股骨头髋关节假体的磨损度量指数比直径28 mm股骨头髋关节假体大0.6%,直径55 mm股骨头髋关节假体磨损度量指数比直径28 mm,36 mm股骨头髋关节假体大2.7%;③提示陶瓷髋关节股骨头尺寸变化对边缘负载接触力影响较小。

ORCID: 0000-0001-7988-2672(廉超)

关键词: 人工髋关节, 边缘负载接触, 初始分离距离, 多体动力学模型, 体积磨损度量指数, 股骨头尺寸, 国家自然科学基金

Abstract:

BACKGROUND: The dynamic computational model of artificial hip joints can effectively simulate the dynamic separation of femoral head and acetabular cup and explore edge contact between the head and cup.
OBJECTIVE: To study the effect of the femoral head diameter on the edge load under dynamic micro-separation of hip joints, to provide a basis for biomechanical analysis of ceramic hip joints corresponding to early high wear problems caused by edge loading, and provide theoretical analyses for hip prosthesis design and clinical application.
METHODS: Using the previously validated method, the dynamic model of artificial hip joint for edge contact based on Adams dynamic simulation software was used to predict dynamic micro-separation and edge contact force in the gait cycle of the hip joint.
RESULTS AND CONCLUSION: (1) The maximum contact force of the edge loading under micro-separation of the cup and femoral head slightly reduced as the femoral head size increased. (2) The severity of edge contact was computed as the product of the edge contact force and its acting time. The severity parameter of φ36 mm head was 0.6% larger than that of φ28 mm one. The parameter of diameter 55 mm hip was 2.7% larger than that of φ28 mm and φ36 mm heads. (3) The change of the ceramic hip femoral head size has negligible effect on the edge loading.

Key words: artificial hip joint, edge load contact, dynamic separation distance, multi-body dynamics model, severity of edge contact, femoral head size, the National Natural Science Foundation of China

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