中国组织工程研究 ›› 2015, Vol. 19 ›› Issue (22): 3467-3471.doi: 10.3969/j.issn.2095-4344.2015.22.005

• 人工假体 artificial prosthesis • 上一篇    下一篇

单髁置换与全膝置换:假体接触表面的应力分析

周秉正,白伦浩,李  彬,王广斌   

  1. 中国医科大学附属盛京医院,辽宁省沈阳市  110004
  • 收稿日期:2015-04-19 出版日期:2015-05-28 发布日期:2015-05-28
  • 通讯作者: 白伦浩,博士,教授,中国医科大学附属盛京医院,辽宁省沈阳市 110004
  • 作者简介:周秉正,男,1984年生,辽宁省人,汉族,2014年中国医科大学毕业,硕士,主治医师,主要从事关节外科、运动创伤方面的研究。
  • 基金资助:

    国家自然科学基金资助项目(81272050)

Unicompartmental arthroplasty versus total knee arthroplasty: stress analysis of prosthetic contact surface 

Zhou Bing-zheng, Bai Lun-hao, Li Bin, Wang Guang-bin   

  1. Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning Province, China
  • Received:2015-04-19 Online:2015-05-28 Published:2015-05-28
  • Contact: Bai Lun-hao, M.D., Professor, Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning Province, China
  • About author:Zhou Bing-zheng, Master, Attending physician, Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81272050

摘要:

背景:单髁置换相比全膝置换具有微创优势,但相对于全膝置换金标准,单髁置换生存率仍存争议。
目的:参数化建立人工单髁置换与全膝置换三维有限元模型,对比分析两者假体接触表面的应力变化。
方法:选择1例单侧行人工单髁置换、对侧行人工全膝置换的志愿者,置换前采用3D CT扫描膝关节,通过三维软件建立膝关节模型,然后通过参数化软件设计与膝关节模型相匹配的关节假体,建立膝关节单髁置换与全膝置换三维模型,最后通过有限元分析软件模拟膝关节在站立和水平行走情况下,膝关节屈曲度分别为0°,10°,30°,60°时内髁的最大等效应力,并进行比较分析。
结果与结论:在模拟站立位时,单髁置换假体与全膝置换假体0°,10°时最大等效应力差异无显著性意义(P > 0.05),模拟30°,60°时单髁置换假体最大等效应力分别高于全膝置换假体15.01%,6.08%,差异有显著性意义(P < 0.05)。模拟水平行走时,模拟0°,10°,30°,60°时单髁置换假体最大等效应力分别高于全膝置换假体5.45%,6.65%,6.67%,9.01%,差异有显著性意义(P < 0.05)。提示单髁置换假体与全膝置换假体水平位元件对聚乙烯垫片磨损无实际意义,但在水平运动时,单髁置换假体聚乙烯垫片磨损可能高于全膝置换假体,可为临床进一步提供指导意义。

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

 

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

 

关键词: 植入物, 数字化骨科, 单髁置换, 全膝关节置换, 三维有限元, 最大等效应力, 生物力学, 应力, 国家自然科学基金

Abstract:

BACKGROUND: Compared with total knee arthroplasty, unicompartmental arthroplasty has the advantage of minimal invasion. Regarding the gold standard of total knee arthroplasty, the survival rate of unicompartmental arthroplasty remains controversial.
OBJECTIVE: To establish three-dimensional finite element model of unicompartmental arthroplasty and total knee arthroplasty, and comparatively analyze the changes in stress on the prosthetic contact surface.
METHODS: One case underwent unicompartmental arthroplasty on one side, and received total knee arthroplasty on the opposite side. Knees were scanned by 3D CT before operation. Knee models were established by three-dimensional software. The matched prosthesis was designed by parameterization software. Three-dimensional models for unicompartmental arthroplasty and total knee arthroplasty were established. By finite element analysis software, maximal equivalent stress was simulated when knee flexion was 0°, 10°, 30° and 60° in standing and walking cases, and results were compared and analyzed.
RESULTS AND CONCLUSION: No significant difference in maximal equivalent stress was detected when knee 
flexion was 0° and 10° in unicompartmental arthroplasty prosthesis and total knee arthroplasty prosthesis in standing case (P > 0.05). At knee flexion of 30° and 60° in standing case, the maximal equivalent stress was significantly greater in unicompartmental arthroplasty prosthesis than in the total knee arthroplasty prosthesis (15.01%, 6.08%; P < 0.05). When knee flexion was 0°, 10° 30° and 60° in standing case, the maximal equivalent stress was higher in unicompartmental arthroplasty prosthesis than in the total knee arthroplasty prosthesis (5.45%, 6.65%, 6.67%, 9.01%;  P < 0.05). These findings verified that in the case of standing, there was no practical significance in wearing of polyethylene insert between unicompartmental arthroplasty prosthesis and total knee arthroplasty prosthesis. In the case of walking, the wearing of unicompartmental arthroplasty may be higher than that of total knee arthroplasty prosthesis, which provides guidance for the clinical practice.

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

 

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

 

Key words: Arthroplasty, Replacement, Knee, Finite Element Analysis, Stress, Mechanical

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