Relative arch deformation

Relative arch deformation (RAD)
• used as a measure of arch stiffness
• shown to be related to the coupling of foot and leg motion . Those with stiffer arches had a stronger connection
• Technique:
• highest point of soft tissue contour of medial arch is measured weightbearing (AH) and another measure when the patient is seated and foot is unloaded (AHU)
• RAD is defined as (AHU-AH)/AHU and then normalised to bodyweight

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