The precise location of the two wedges is adjusted individually by expert trainers using standardized protocols. Subjects in the intervention group will receive a proper wedge; subjects in the sham group will receive an almost flat wedge that lacks the proper biomechanical characteristics. However, both shoes and wedges will look similar. All subjects will be instructed to start gradually, with a goal of reaching 30 minutes of in-home walking while wearing the special training shoes. As an extra pre-caution, all subjects will be asked to walk with the shoes only in the presence of a caregiver, spouse or other family member during the first month. Before moving to more independent training, subjects will be checked for safety.