Saturday, February 5, 2011
Short Leg Syndrome: Modification of Midsole Lift
One of the problems I see with midsole lifts when treating limb length discrepancies is the inherent instability created by lifting that foot higher off the ground. So a pronator may pronate alittle more, and a supinator may supinate alittle more, with midsole lifts. The photos below illustrate a simple technique to eliminate most of this problem. The advantage of using midsole lifts, and not having to use them inside the shoe, does create a better shoe fit. Better shoe fit better stability and better comfort.
Here is a typical full length lift for the midsole of a shoe. These are made of a certain density (normally 30 to 40 durometer) for stability and cushion.
Here is a dual density lift. The black part is 30 durometer and the white part 45 durometer. This is designed to stop pronation. The opposite pattern can be used for supination problems. This is a more stable and predictable way to control these forces in contrast to placing a varus or valgus wedge on the lift.