Design and Development of An Instrumented Knee Joint for Quantifying Ligament Displacements

IF 0.8 4区医学 Q4 ENGINEERING, BIOMEDICAL

Journal of Medical Devices-Transactions of the Asme Pub Date : 2021-06-10 DOI:10.1115/1.4051440

Lei Cui, B. Dale, G. Allison, Min Li

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引用次数: 1

Abstract

Recently, robotic assistive leg exoskeletons have gained popularity because an increased number of people crave for powered devices to run faster and longer or carry heavier loads. However, these powered devices have the potential to impair knee ligaments. This work was aimed to develop an instrumented knee joint via rapid prototyping that measures the displacements of the four major knee ligaments—the anterior cruciate ligament (ACL), posterior crucial ligament (PCL), medial collateral ligament (MCL), and lateral collateral ligament (LCL)—to quantify the strain experienced by these ligaments. The knee model consists of a femur, lateral and medial menisci, and a tibia-fibula, which were printed from three dimensional (3D) imaging scans. Nonstretchable cords served as main fiber bundles of the ligaments with their desired stiffnesses provided by springs. The displacement of each cord was obtained via a rotary encoder mechanism, and the leg flexion angle was acquired via a closed-loop four-bar linkage of a diamond shape. The displacements were corroborated by published data, demonstrating the profiles of the displacement curves agreed with known results. The paper shows the feasibility of developing a subject-specific knee joint via rapid prototyping that is capable of quantifying the ligament strain via rapid prototyping.

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量化膝关节韧带位移的仪器设计与研制

最近，机器人辅助腿外骨骼越来越受欢迎，因为越来越多的人渴望电动设备能跑得更快、更长或承载更重的负载。然而，这些动力装置有可能损害膝盖韧带。这项工作旨在通过快速原型设计开发一种仪器化膝关节，测量四种主要膝关节韧带——前交叉韧带（ACL）、后关键韧带（PCL）、内侧副韧带（MCL）和外侧副韧带（LCL）——的位移，以量化这些韧带所经历的应变。膝盖模型由股骨、外侧和内侧半月板以及胫骨-腓骨组成，这些都是通过三维（3D）成像扫描打印出来的。不可伸缩绳索作为韧带的主要纤维束，其所需的刚度由弹簧提供。通过旋转编码器机构获得每条绳索的位移，并通过菱形的闭环四连杆机构获得腿部屈曲角度。已公布的数据证实了位移，表明位移曲线的轮廓与已知结果一致。该论文展示了通过快速原型开发特定对象膝关节的可行性，该膝关节能够通过快速原型量化韧带应变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Medical Devices-Transactions of the Asme ENGINEERING, BIOMEDICAL-

CiteScore

1.80

自引率

11.10%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Medical Devices presents papers on medical devices that improve diagnostic, interventional and therapeutic treatments focusing on applied research and the development of new medical devices or instrumentation. It provides special coverage of novel devices that allow new surgical strategies, new methods of drug delivery, or possible reductions in the complexity, cost, or adverse results of health care. The Design Innovation category features papers focusing on novel devices, including papers with limited clinical or engineering results. The Medical Device News section provides coverage of advances, trends, and events.