When the subtalar joint pronates, the leg internally rotates. These motions cannot be separated so abnormal subtalar joint pronation will cause internal rotation of the leg when it should not be internally rotated. This can cause stress at the knee and the hip which can also cause low back pain.
By reducing abnormal subtalar joint pronation, functional orthotics help maintain the proper position of the leg at the knee and hip. Even though abnormal subtalar joint function causes only a slight misalignment of these structures, the cumulative effect over time can cause serious problems.
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