Isolated dislocation of the medial cuneiform is a rare injury. A favorable outcome relies on an accurate and stable reduction. Evidence of residual instability can be subtle. We present 1 such injury whose true extent was not fully appreciated at presentation, despite multiple plain films. Occult fracture of the medial cuneiform contributed to residual instability of the first ray and persistent and progressive symptoms and ultimately necessitated operative stabilization of the medial arch. We recommend the use of computed tomography as an adjunct to plain radiography for all midfoot dislocations to more accurately define the extent of the injury.