Check out these Shoe Lifts. In Both Men & Women versions. These lifts are designed to make you taller but could work great for some one with a short leg due to injury or delayed growth. They are sold as one size fits all and can be easily trimmed to your foot wear. They are sold in pairs but it appears that they both could be trimmed for the same side which would allow you to have two shoes outfitted with a lift. Some are fixed heights and others can be adjusted. These could also make great tools for Physio therapists when assessing Leg Length Discrepancies.