Background

Studies describe subtalar and ankle arthrodesis as a fac-tor altering the biomechanics of the foot during walking [1-3]. Furthermore, foot orthoses (FOs) are also recog-nized for their actions on the dynamics of the foot [4] but not for their actions on an isolated subtalar arthrod-esis (ISA). Previous studies have shown that depending on the type of FOs [5] and along the comfort felt by the subject [6], the variations induced by different FOs were significantly different. The aim of this study was to com-pare the effects of different types of FOs on gait analysis with an ISA. Two subjects with ISA were volunteers for one session of three repeated measures: without FOs (Control), with Classical FOs (FOsC) and with Molded FOs (FOsM). After a clinical examination, these two types of FOs are custom-made including same posting. We compared walking variations through the Latero-Medial Index (LMI) on force platform. Four data’s have been compared: Latero-Medial Force Index (LMFI), Latero-Medial Area Index (LMAI) together with observation of these index at 100ms which correlate with hind foot activ-ity phase during walking [7]. The perception of comfort was evaluated by using previously established footwear comfort measures [6]: 100mm visual analog scale (VAS)