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Heel Strike
Study after study has shown that repeated impact between the foot and the ground can cause a wide range of injuries, from stress fractures to cartilage breakdown, from shin splints to low back pain.
Force impact on the body, created by each heel strike, equals:
This means that a person weighing 160lbs feels 560lbs of force while running and 400lbs while walking, and 80lbs of force in the neck on each heel strike.
Mid-Stance
At mid-stance, the foot 'flattens’ and is prone to pronation or hyperpronation. This is the optimal part of the gait cycle, at which point excessive pronation can be seen and measured.
An untreated foot rotates (most often internally), which in turn rotates the tibia and femur, and then the pelvis. This translates into the sacroiliac joint, which can create low back pain. This is also the portion of the gait cycle that can create functional leg length inequality.
Toe-Off
In this phase, the foot becomes a lever. However, if the gait cycle is dysfunctional during heel strike and mid stance, toe-off (or propulsion) can be ineffective. In fact, a recent study found that foot flare prior to and during toe-off can cause a runner to run up to the equivalent of an extra half mile during the course of a marathon.
Foot Levelers Can Help
Foot Levelers custom functional orthotics help the feet and the kinetic chain throughout all 3 phases of the gait cycle.