Article

It is estimated that approximately 45% of the U.S. population will develop knee
osteoarthritis, a disease that creates significant economic burdens in both
direct and indirect costs. Laterally wedged insoles have been frequently
recommended to reduce knee abduction moments and to manage knee osteoarthritis.
However, it remains unknown whether the lateral wedge will reduce knee abduction
moments over a prolonged period of time. Thus, the purposes of this study were to
(1) examine the immediate effects of a laterally wedged insole in individuals
normally aligned knees and (2) determine prolonged effects after the insole was
worn for 1 week. Gait analysis was performed on ten women with and without a
laterally wedged insole. After participants wore the wedges for a week, a second
gait analysis was performed with and without the insole. The wedged insole did
not affect peak knee abduction moment, although there was a significant increase
in knee abduction angular impulse after wearing the insoles for 1 week.
Furthermore, there was a significant increase in vertical ground reaction force
at the instance of peak knee abduction moment with the wedges. While the
laterally wedged insole used in the current study did not alter knee abduction
moments as expected, other studies have shown alterations. Future studies should
also examine a longer acclimation period, the influence of gait speed, and the
effect of different shoe types with the insole.
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