A 34-year-old man presented with a deformed and painful foot 14 months after surgery for a Lisfranc's dislocation;​ the procedure had been done elsewhere. Radiographs showed a lateral dislocation of the Lisfranc's joint that had not been reduced. At the time of reexploration, the split anterior tibial tendon was displaced between the medial and middle cuneiform bones, which was blocking reduction. After placing the anterior tibial tendon into its normal position, the reduction remained incomplete because of a deformed articular surface. Arthrodesis of the Lisfranc's joint was then performed. In a lateral dislocation of the Lisfranc's joint, which is irreducible by manipulation, an interposition of the anterior tibial tendon should be suspected.