Flexible flatfoot is a common foot form that may be seen in the majority of neonates and many adults. In the first ten years of life, the arch rises on its own in the majority of children. There is no proof that any external forces or equipment may develop a longitudinal arch in a child's foot. Some teenagers and adults have discomfort and incapacity as a result of flexible flatfoot with a short Achilles tendon, which is different from basic flexible flatfoot. When conservative measures do not reduce discomfort behind the head of the plantar flexed talus or in the sinus tarsi region, surgery that preserves the joint and corrects deformities is considered for flexible flatfeet with short Achilles tendons. The first and most important technique of choice is osteotomy. In almost all situations, extending the Achilles tendon is necessary. In certain situations, the forefoot has a hard supination deformity, which must be identified and treated at the same time.