A, Patient with sag at naviculocuneiform and first tarsometatarsal joints; lateral process of talus is abutting anterior process of calcaneus. B, Varus of first metatarsal is consistent with instability of first tarsometatarsal joint; subluxation of talonavicular joint also is present. C, Lateral view 6 months after medial column arthrodesis shows improvement in talometatarsal angle and opening of sinus tarsi. D, Anteroposterior view shows improved talonavicular coverage.