Naviculocuneiform Sag in the Acquired Flatfoot: What to Do.

Sag at the naviculocuneiform (NC) joint represents an important aspect of the flatfoot deformity. Failure to address medial column instability could lead to continued deformity and poor patient outcomes. No single procedure is enough to address the complexity of the adult acquired flatfoot deformity. Whether in combination with other procedures or in isolation, NC fusion and Cotton osteotomy are important pieces of the armamentarium to address all aspects of the flatfoot deformity.