This article looked at the alterations in lower extremity motion during walking produced by a foot orthosis posted medially under both the rearfoot and the forefoot. The authors note that previous research on the mechanical effects of foot orthoses has been equivocal. They propose that some of the variance in research findings might be attributable to insufficient posting under the forefoot – more specifically, a post that would extend beyond the metatarsal heads. The 15 subjects were identified to have a forefoot varus greater than 10 degrees, but without lower extremity pain at the time of the data collection. Subject data was collected at two occasions: at the time of the orthosis fabrication and after having worn the orthoses for one week. The data was collected wearing sandals so that the segments markers could be attached to the foot instead of a shoe allowing investigation of motion of the forefoot.