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Pain of flat foot patients often appears at the heel, navicular bone part, and the metatarsal bone part. The purpose of this study was to compare normal arch group and low arch group, to determine differences of the plantar pressure of medial longitudinal arch, and to track the center of foot pressure between those two groups during normal gait. The subjects were 18 healthy adults with 36 feet, and we classified 9 normal left arches of the foot, 9 low left arches of the foot, 9 normal right arches of the foot, and 9 low right arches of the foot. The left low arch group showed a significantly greater value of plantar pressure in 1 metatarsal bone, 3 metatarsal bone, 5 metatarsal bone, arch section, lateral heels, and medial heel in comparison with left normal arch group. Right low arch group showed a significantly greater value of plantar pressure in the arch section in comparison with right normal arch group. The center of foot pressure was significantly higher than normal arch groups, and this was considered to show a relationship with pain of the flat foot. Tracking the center of foot pressure for low arch groups showed irregular waveforms medially in comparison with normal arch group. We have speculated that there is a spring function at the arch of the foot to absorb shock. The low arch foot groups could not perform the spring function under load during gait, so the centers of foot pressure were high. The most likely reason why the low arch group showed irregular and more interior waveform from the inside at the locus of the foot pressure was that absorption of the pressure was more inside due to the low medial longitudinal arch. Irregular waveform of the tracking center of foot pressure was considered to show unstable stance phase during gait.

Comparison of Plantar Pressure and Center of Pressure of the Normal Arch and Row Arch