Reproduced with permission from: Hagins M, Pappas E. Biomechanics of the Foot and Ankle. In: Basic Biomechanics of the Musculoskeletal System, Nordin, M, Frankel VH (Eds), Lippincott Williams & Wilkins, Philadelphia 2012. Copyright © 2012 Lippincott Williams & Wilkins.
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