Flatfoot or planovalgus foot is a combination of deformities that includes a valgus deformity of the hindfoot and a supination deformity of the forefoot, with midfoot abduction and collapse of the medial longitudinal arch. A lateral column lengthening procedure typically is performed to correct abduction deformity across the talonavicular joint. A large amount of confusion exists with regard to the indications for a lateral column lengthening procedure. Several studies have suggested that lateral column lengthening alone can correct midfoot abduction in patients with flatfoot. Some surgeons prefer to perform procedures that spare the joint, such as a lengthening osteotomy of the calcaneus. Conversely, proponents of distraction arthrodesis of the calcaneocuboid joint cite the risk for degenerative changes at the calcaneocuboid joint because of increased contact pressure at that level after the calcaneal osteotomy. Currently, the decision of which procedure to perform is controversial. We agree with the proponents of distraction arthrodesis and decided to perform calcaneocuboid distraction arthrodesis in our patients. From January 2009 to December 2019, 18 patients (30 feet) underwent lateral column lengthening arthrodesis through the calcaneocuboid joint. Of these patients, 17 had a neuromuscular disease and one had a posttraumatic acquired flatfoot. The mean patient age at the time of surgery was 23.3 years. The minimum follow-up was 2 years. The mean follow-up was 4.8 years. Good outcomes occurred in 23 feet (76.6%), fair outcomes occurred in three feet (10%), and poor outcomes occurred in four feet (13.3%). Poor outcomes resulted from the recurrence of deformity because of nonunion, with resorption of the graft and screw breakage. In conclusion, lateral column lengthening arthrodesis through the calcaneocuboid joint is a successful treatment option for the management of neuromuscular planovalgus foot deformity in ambulatory patients. The high rate of nonunion is a considerable limitation of the procedure.