Foot Arch Height Measurement during Gait with Smartphones or Action-cams

Foot arch problems such as flat foot, high and rigid arch foot are quite common. Such issues cause the decrease of impact absorbance, drops of walk endurance and sense of balance and deformation like Hallux Valgus. Measurements of the detailed movement and deformity of the foot are difficult because of its quickness in gait process. The standard diagnosis had been made at stand-still posture or naked eye observance by a podiatrist. We have developed a computer vision-based bone marker tracking system for Point of Care, that works with common smart-phone or action-cam. With this system, the podiatrist could quantitatively judge problems of bone or joint movement and deformity during gait. The effects of the prescribed insoles are also quantitatively validated with this system. Flatfoot subject showed 10 percent increased the arch angle. High and rigid arch subject shown improvement on reactive control of the arch.