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Limb-length conditions can result from:
A discrepancy in leg length during growth will cause a tilted sacral base, with a lumbar curvatureresulting in a scoliosis which is usually mild, but the underlying cause should be identified and corrected in order to allow balanced spinal growth. If there is an anatomical difference in the length of the legs, a heel lift (or sole lift, in some cases) should be supplied. A functional short leg is due to an asymmetry in alignment, most commonly as a result of a sacro iliac disfunction, excessive pronation and/or lack of development of an arch of one foot. It is very important to recognize the functional short leg, since providing a heel lift instead of an orthotic is likely to perpetuate any associated sacroiliac subluxations. There is little reliable information on the radiographs to differentiate these conditions. A good clinical postural exam with lower extremity screening (including shoe wear patterns) can help make this determination.