Chinese Journal of Rehabilitation Theory and Practice ›› 2024, Vol. 30 ›› Issue (10): 1224-1231.doi: 10.3969/j.issn.1006-9771.2024.10.013

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Three-dimensional modeling of foot motion based on low-cost inertial measurement unit and force sensing resistor

YANG Ping1,2,3(), CHEN Haoyuan2, GAO Ruixin2, WANG Xinping2, Philip ROWE3   

  1. 1. Department of Rehabilitation Engineering, China Rehabilitation Science Institute, Beijing 100068, China
    2. Capital Medical University School of Rehabilitation Medicine, Beijing 100068, China
    3. University of Strathclyde, Glasgow G1 1XQ, UK
  • Received:2024-07-24 Revised:2024-08-12 Published:2024-10-25 Online:2024-11-08
  • Contact: YANG Ping, E-mail: yangping2005668@163.com
  • Supported by:
    Fundamental Research Funds for Central Public Welfare Research Institutes, conducted by China Rehabilitation Science Institute(2022CZ-7)

Abstract:

Objective To develop a portable three-dimensional foot motion analysis system based on low-cost inertial measurement units (IMU) and force sensing resistor (FSR), and to explore the feasibility of assessing three-dimensional motion of internal small joints of foot in barefoot and shod conditions.

Methods The system consisted of data sampling, data transmitting and data processing parts. IMUs were employed for data acquisition of small foot joints, and FSRs were utilized to detect heel strike and toe off. All the data were transmitted via wireless local area network. Data processing was accomplished by a self-programmed Excel macro. From January to July, 2024, two healthy female subjects wearing the device walked in the corridor at self-selected pace, for ten meters. Gait analysis was used to conduct consistency test on subject 2. Dorsiflexion-plantarflexion, adduction-abduction and internal rotation-external rotation of the 1st metatarsal relative to the phalangeal (Met-Ph), the midfoot relative to the 1st metatarsal (Mid-Met) were recorded and analyzed on subject 1 in consecutive barefoot walking and two types of nurse footwear walking conditions.

Results The system showed good consistency between tests. Dorsiflexion-plantarflexion, adduction-abduction and internal rotation-external rotation ranges of motion were reduced in both Met-Ph and Mid-Met with shoes compared with those of bare foot, they were the least in arch support.

Conclusion A low-cost, portable three-dimensional foot motion analysis system has been developed, which could be used to measure barefoot motion and shod foot motion in consecutive walking.

Key words: inertial measurement units, force sensing resistor, foot, three-dimensional motion model, gait analysis

CLC Number: