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 mac-ro.From January to July,2024,two healthy female subjects wearing the device walked in the corridor at self-se-lected pace,for ten meters.Gait analysis was used to conduct consistency test on subject 2.Dorsiflexion-plan-tarflexion,adduction-abduction and internal rotation-external rotation of the 1st metatarsal relative to the phalan-geal(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 inter-nal 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.
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