According to the Journal of Medical and Biological Engineering “shoe Lifts are in a position to right the leg-length discrepancies (LLDs) and relieve limp gaits of individuals with unilateral developmental dysplasia from the hip (DDH)

http://www.best-escort.eu/member/1542/blog/view/629/
http://www.fightthehurt.org/blogs/post/1191
http://michelleorsini.com/how-to-wear-hunter-wellies/