can i interject in a friendly way here?
that's a dubious diagnosis IMO. numbness is more likely to be caused by irritation/pressure of a nerve or lack of blood flow. wedges don't correct either of those problems. wedges might correct biomechanical alignment of hip, knee and ankle for a more efficient pedal stroke and possibly reducing the chance of injury to one of those joints.
having said that, i do use wedges ...but not to address numbness.
Off course numbness can be created by many factors but the wedges have helped me and many others with lateral numbness from applying force almost solely on the outside of the foot, if you step manily on the outside of the foot wedges or specialized BG shoes is well worth a try
IMHO
lemond wedges - foot pain 