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Technical Brief

An Ergonomic Testing System for the First Metatarsophalangeal Joint Stiffness

[+] Author and Article Information
Fatemeh Farhadi

University of Michigan and Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, China 200240
ftmhfarhadi71@sjtu.edu.cn

Muhammad Faraz

University of Michigan and Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, China 200240
Faraziii@sjtu.edu.cn

Marabelle Heng

Podiatry Department, Singapore General Hospital, Diabetes and Metabolism Centre, 17 Third Hospital Avenue, Singapore 168752
marabelle.henglw@gmail.com

Shane Johnson

University of Michigan and Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, China 200240; State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, China
shane.johnson@sjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4040248 History: Received November 12, 2017; Revised May 08, 2018

Abstract

Osteoarthritis sufferers commonly have first metatarsophalangeal joint problems in which articular surfaces are changed permanently due to fatigue. Therefore, medical devices for early diagnosis would increase the opportunity for prevention of disease progression. In previous studies on stiffness of the 1st MTPJ many details, although functionally of great importance, have not been fully considered including: design and size of the device, tribology consideration and errors from device. Therefore, the motivation of our research was to enhance the device design by reducing the size of the device, and device design was enhanced by minimizing measurement errors through development of a new ergonomic left and right foot instrument located medial to the 1st MTPJ (instead of beneath the foot). The 1st MTPJ stiffness (N.mm/ kg. radian) measurement was taken on 28 subjects with two replicates per subject by the same tester. The 1st MTPJ stiffness ranged from 3.49 to 14.42 N.mm/ kg. radian with the mean (SD) value of 8.28 (3.15) N.mm/ kg. radian for the left feet and 3.91 to 11.90 N.mm/ kg. radian with the mean (SD) value of 7.65 (2.07) N.mm/ kg. radian for the right feet. Reliability evaluation was measured using Intraclass Correlation Coefficient and described an excellent reliability between two tests.

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