Abstract
The flattened foot arch causes the mechanical overloading transferred to proximal areas (i.e. ankles, knees, or hips) over time. Thus, the flatfoot is recognized as a contributory factor in a wide variety of musculo-skeletal pathologies in lower extremities. Commonly, flatfoot deformities are treated using specially designed insoles that support the arch and correct the posture of lower limbs. However, the biomechanical effects of the insoles are not yet fully understood, so there still are controversies whether such insoles really have clinical significance [Chen, 2010]. In this study, in order to verify the effects of insoles and determine the best shape of the insoles, we examined how the medio-lateral knee joint reaction force changes due to insole conditions. Since large knee joint reaction force is one of major causes of knee osteoarthritis or knee pain [Radin, 1991], our study will be beneficial in prescribing insoles to prevent knee pathologies of flatfoot patients.
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