A 54-year-old female has a painful flatfoot that has not improved with over 8 months of conservative management with orthotics. Preoperatively, she was unable to perform a single-heel rise and her hindfoot was passively correctable. Figures A and B are radiographs of the affected left foot. She undergoes FDL tendon transfer to the navicular, medial slide calcaneal osteotomy, and tendoachilles lengthening procedures. Following these procedures, the appearance of the foot is demonstrated in Figure C. What is the next most appropriate intraoperative procedure to be performed during her foot reconstruction?