An LLD is a significant difference between the lengths of limbs. It may be as much as several centimeters or inches, and it’s likely most noticeable in legs. For this difference some people have great success getting a custom shoe lift or a custom heel lift, other opt for bone-shortening or lengthening surgery. A person with an LLD may be able to compensate for the differences in their limbs. However, over time, LLD can lead to side effects and complications, like pain and difficulty walking or running.