A wearable system for multi-segment foot kinetics measurement

作者：Rouhani H^*; Favre J; Crevoisier X; Aminian K

来源：Journal of Biomechanics, 2014, 47(7): 1704-1711.

DOI：10.1016/j.jbiomech.2014.02.027

• Multi-segment foot kinetics
• Pressure insole
• Inertial sensors
• Gait
• Inverse dynamics

This study aims to design a wearable system for kinetics measurement of multi-segment foot joints in long-distance walking and to investigate its suitability for clinical evaluations. %26lt;br%26gt;The wearable system consisted of inertial sensors (3D gyroscopes and 3D accelerometers) on toes, forefoot, hindfoot, and shank, and a plantar pressure insole. After calibration in a laboratory, 10 healthy elderly subjects and 12 patients with ankle osteoarthritis walked 50 m twice wearing this system. Using inverse dynamics, 3D forces, moments, and power were calculated in the joint sections among toes, forefoot, hindfoot, and shank. %26lt;br%26gt;Compared to those we previously estimated for a one-segment foot model, the sagittal and transverse moments and power in the anlde joint, as measured via multi-segment foot model, showed a normalized RMS difference of less than 11%, 14%, and 13%, respectively, for healthy subjects, and 13%, 15%, and 14%, for patients. Similar to our previous study, the coronal moments were not analyzed. Maxima-minima values of anterior-posterior and vertical force, sagittal moment, and power in shank-hindfoot and hindfoot-forefoot joints were significantly different between patients and healthy subjects. Except for power, the inter-subject repeatability of these parameters was CMC %26gt; 0.90 for healthy subjects and CMC %26gt; 0.70 for patients. Repeatability of these parameters was lower for the forefoot-toes joint. %26lt;br%26gt;The proposed measurement system estimated multi-segment foot joints kinetics with acceptable repeatability but showed difference, compared to those previously estimated for the one-segment foot model. These parameters also could distinguish patients from healthy subjects. Thus, this system is suggested for outcome evaluations of foot treatments.

• 出版日期2014-5-7