Variable-stiffness shoes reduce knee adduction moment, decrease pain, and improve function .
Changes in knee adduction moment, pain, and functionality with a variable-stiffness walking shoe after 6 months
J Orthop Res. 2010 Jul;28(7):873-979 patients with symptomatic medial compartment knee osteoarthritis (confirmed with a MRI) were randomized to a variable-stiffness footwear or a constant-stiffness footwear worn at least 4 hr/day for a period of 6 months. At 6 months,variable-stiffness shoes were found to be effective in reducing the peak knee adduction moment, as well as decreasing pain and improving function.
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