[Flat foot: treatment by sub-talar arthrodesis with reposition of the talus calcaneum (author's transl)].

Since 1962, the authors have used a technique of sub-talar arthrodesis combined with talar-calcaneal reposition ("horseman" operation) in cases of valgus flat foot, accompanied by symptoms, in moderate forms with exaggerated talar-calcaneal divergence and verticalisation of the talus. This operation involves only the sub-talar joint. The mid-tarsal joint is untouched. Technique must be precise in order to avoid hyper or hypo-correction. The results are constantly good. The mid-tarsal joint remains free, which offers a definite advantage in comparison with classical double tarsectomy.