Four Bar Linkage Knee Analysis
Four Bar Linkage Knee Analysis
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四连杆膝关节分析
DOI：
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发表时间：
2011
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影响因子：
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通讯作者：
Michael Greene
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文献类型：
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作者：
Michael Greene
现代假肢专家有多种假肢膝盖可供选择，可以满足许多不同的规格。 “摩擦”、“安全”、“锁定”、“液压”等名称很快让人想起单轴膝关节的特定类别。对于这些单轴膝关节，其名称（摩擦力、安全性等）仅说明了一个独特的功能，该功能定义了该类膝关节的主要机械优势。然而，多中心膝盖可能会让假肢师感到困惑。这种混淆是由于术语“多中心”没有定义任何特定功能的事实造成的。其次，要充分了解这些膝盖的功能，需要的不仅仅是简单的力学知识。本文将研究一类被称为“四连杆机构”的多中心膝关节。将介绍评估这些膝盖的简单方法。这些评估方法将使假肢师能够确定大多数四杆设计的主要机械或外观优势。假肢师还将学习评估特定四杆设计在实现其特定机械或美容目标方面的效率的比较方法。这项技能非常重要，因为每个四杆设计的操作都是独一无二的。具体来说，每个四杆膝盖的设计都是为了增强个人特征，例如安全性、美观性、节能和/或摆动阶段运动。
Modern prosthetists have a wide selec tion of prosthetic knees to fulfill many in dividual specifications. The names "fric tion," "safety," "lock," "hydraulic," etc. quickly recall particular classes of single axis knees. For these single axis knees, the name (friction, safety, etc.) simply states a unique feature which defines the major mechanical advantage of that class of knees. Polycentric knees, however, may pre sent the prosthetist with confusion. This confusion results from the fact that the term "polycentric" does not define any specific function. Secondly, these knees require more than a simple knowledge of mechanics to fully understand their func tions. This paper will examine one category of polycentric knees which are known as "four bar linkages." Simple methods for evaluating these knees will be presented. These evaluating methods will enable the prosthetist to determine the major mechanical or cosmetic advantage of most four bar designs. The prosthetist will also learn comparative methods of evaluating the efficiency of a particular four bar de sign in attaining its specific mechanical or cosmetic goals. This skill is extremely im portant since each four bar design is unique in its operation. Specifically, each four bar knee has been designed to en hance individual characteristics such as safety, cosmesis, energy conservation and/or swing phase motion.