Osteoarthritis sufferers commonly have first metatarsophalangeal joint (MTPJ) 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 first 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 first MTPJ (instead of beneath the foot). The first MTPJ stiffness (N mm/kg radian) measurement was taken on 28 subjects with two replicates per subject by the same tester. The first 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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October 2018
Technical Briefs
An Ergonomic Testing System for the First Metatarsophalangeal Joint Stiffness
Fatemeh Farhadi,
Fatemeh Farhadi
University of Michigan and
Shanghai Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
Shanghai Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
Search for other works by this author on:
Muhammad Faraz,
Muhammad Faraz
University of Michigan and
Shanghai Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
Shanghai Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
Search for other works by this author on:
Marabelle Heng,
Marabelle Heng
Podiatry Department,
Diabetes and Metabolism Centre,
Singapore General Hospital,
17 Third Hospital Avenue,
Singapore 168752
Diabetes and Metabolism Centre,
Singapore General Hospital,
17 Third Hospital Avenue,
Singapore 168752
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Shane Johnson
Shane Johnson
University of Michigan and
Shanghai Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China;
Shanghai Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China;
State Key Laboratory of Mechanical System and Vibration,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: Shane.johnson@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: Shane.johnson@sjtu.edu.cn
Search for other works by this author on:
Fatemeh Farhadi
University of Michigan and
Shanghai Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
Shanghai Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
Muhammad Faraz
University of Michigan and
Shanghai Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
Shanghai Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
Marabelle Heng
Podiatry Department,
Diabetes and Metabolism Centre,
Singapore General Hospital,
17 Third Hospital Avenue,
Singapore 168752
Diabetes and Metabolism Centre,
Singapore General Hospital,
17 Third Hospital Avenue,
Singapore 168752
Shane Johnson
University of Michigan and
Shanghai Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China;
Shanghai Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China;
State Key Laboratory of Mechanical System and Vibration,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: Shane.johnson@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: Shane.johnson@sjtu.edu.cn
1Corresponding author.
Manuscript received November 12, 2017; final manuscript received May 8, 2018; published online June 21, 2018. Assoc. Editor: Zong-Ming Li.
J Biomech Eng. Oct 2018, 140(10): 104501 (6 pages)
Published Online: June 21, 2018
Article history
Received:
November 12, 2017
Revised:
May 8, 2018
Citation
Farhadi, F., Faraz, M., Heng, M., and Johnson, S. (June 21, 2018). "An Ergonomic Testing System for the First Metatarsophalangeal Joint Stiffness." ASME. J Biomech Eng. October 2018; 140(10): 104501. https://doi.org/10.1115/1.4040248
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