The plantar pressure analyzer evaluates the correctness of gait by combining static and dynamic data. The specific judgment basis is as follows:
1. Static plantar pressure evaluation
Arch shape detection
By the pressure distribution during standing, judge whether the arch is normal (such as flat feet or high arches). Abnormal arches will cause pressure to be concentrated in the forefoot or heel area, deviating from the normal range.
Pressure symmetry analysis
Compare the peak and distribution symmetry of the left and right plantar pressures. If the difference exceeds the physiological threshold (such as abnormal unilateral pressure ratio), it indicates gait imbalance or abnormal foot structure.
2. Dynamic gait parameter analysis
Pressure center trajectory
The pressure center trajectory should be coherent and centered when walking. If the trajectory is offset (such as excessive deviation to the outside or inside of the foot), it may indicate an inward/outward eight-character gait or insufficient ankle joint stability.
Gait cycle stage division
Analyze the proportion of support period and swing period (normal support period accounts for 60%-65% of the gait cycle) and the proportion of single/double foot support time. Abnormal proportions may reflect muscle coordination or limited joint movement.
Peak distribution of plantar pressure
In normal gait, the pressure gradually transfers to the forefoot after the heel touches the ground, and the pressure is concentrated on the forefoot during the push-off period. If the pressure peak is abnormally concentrated in a local area (such as long-term high pressure on the heel), it indicates abnormal gait or foot compensation.
III. Identification of abnormal gait characteristics
Foot morphology and gait association
Detect abnormal structures such as valgus, inversion or X/O-shaped legs, and judge the gait compensation mechanism in combination with pressure distribution (such as excessive pressure on the outer side of the forefoot).
Movement coordination assessment
If the step frequency, stride or foot deviation angle deviates significantly from the normal range of children of the same age in the dynamic test (such as too short stride, too low step frequency), it indicates abnormal neuromuscular control or developmental delay.
IV. Balance ability and intervention verification
Closed-eye balance test
Evaluate vestibular function and proprioception through the trajectory of center of gravity movement in the eyes open/closed state. Abnormal shaking or trajectory deviation indicates insufficient balance ability
Comparison of correction effects
Through multiple tests with bare feet, shoes or orthotic insoles, the improvement of lower limb force lines (such as improved uniformity of pressure distribution) is compared to verify the effect of gait adjustment.
The plantar pressure analyzer quantifies plantar pressure distribution, gait cycle parameters and balance ability, combines structural and functional indicators, and determines whether the gait meets the biomechanical standards in multiple dimensions, and provides data support for personalized correction.
