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Gait Characteristic Indices to Quantitatively Characterize Human Gait

Gait characteristic indices to quantitatively characterize human gait are created and introduced in this article. A force plate and F-Scan stress measurement system were used to collect the vertical force for test subjects' level of walking at normal speed. The indices for the heel (Hi) and forefoot (Fi) were calculated for 48 nonamputee and 3 transtibial amputee subjects averaged over four to six gait cycles. The following observations can be made for 48 nonamputee subjects: a) the indices are sensitive to the gait characteristics and are able to identify patterns of walking; b) for each subject, the indices' standard deviations from step to step are small; and c) the differences between left and right feet for each subject were also small. For three transtibial amputee subjects, observations (a) and (b) described above were also observed to be true. There is an additional observation: d) the mechanical properties of prosthetic feet have a significant effect on the gait of the amputated side with prosthetic foot, but affect the nonamputated side to a much smaller degree. Statistical analysis showed the indices are able to quantitatively characterize the gait of lower limb amputees and nonamputees. The indices may potentially be used to select or design products, e.g., prosthetic feet for amputees with mechanical properties that match the gait characteristics of a person, leading to optimal performance.