靴底の踏力分布にもとづく歩行解析と疾患予防靴底の設計

抄録

The relation between three dimensional tread force distribution and abrasion loss of the sole is clarified in order to design the sole of walking shoes for disease prevention of knee osteoarthritis. Based on the supposition that abrasion occurs in the elements where sliding occurs, the abrasion area would be easily identified by the use of the amount of sliding parameter S calculated from three dimensional tread force distribution. For S changing dynamically, we examined a correlation between the abrasion amount loss in the used sole and the distribution of S: Case 1; after heel contacting (grounding time t=0.198 seconds), Case 2; before toe out (t=0.685 seconds) and Case 3; the total amount of S (>0) in the whole grounding time. The Spearman's rank correlation was used for a statistical analysis. By examining the level of significance for 5%, the positive correlations were accepted in Case 1 and Case 2, and not accepted in Case3. Because the tendencies of the abrasion amount change is different in each sole element, the difference in the abrasion amount over the sole elements was observed due to the sole shape change. To calculate the parameter S from three dimensional tread force distribution after heel contact and before toe out during the walking period, the estimation with parameter S would be valid to identify the element where the abrasion easily occur at the heel part and toe part.