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Five patients with symptomatic flexible pes planus unresponsive to conservative therapy underwent nine open wedge anterior calcaneal osteotomies and advancement of the posterior tibial tendon. The average follow-up was 6 years, 8 months. Three patients exhibited medial and plantar talonavicular subluxation and naviculocuneiform sag. There were three excellent results, three very good, two good, and one poor. The patient with a poor rating was asymptomatic, had normal foot motion, and was satisfied with the procedure.
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Anderson et al. (1984) studied this question.
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