Quantification of the compensation of differences in limb length using heel raises

BackgroundThe compensation of limb length discrepancy achieved using heel lifts is quantified.ObjectiveTo determine the increase in effective length of the lower limbs depending on the height of heel lift used.MethodFive anatomical landmarks in 36 subjects are measured to quantify the increase in level, taking as reference the support surface of the pedoscope, when heel lifts of 6, 12, and 18 mm are used. The results of these measurements are compared to calculate the real increase in height achieved for lifts of known thickness.ResultsThe use of heel lifts increases the height of the extremity by 76.4% of the maximum height of the lift measured at the posterior edge of the heel.ConclusionReal compensation value must be considerated using heel lifts in the treatment of limb length discrepancy.