Historically, metatarsus adductus, metatarsus varus [1,2] , metatarsus adductovarus [3] , pes adductus [4] , metatarsus supinatus [5] , forefoot adductus [6] , and hooked forefoot [7] are names given to medial deviation of the forefoot. In all these synonyms, the deformity is located at Lisfranc's joint in a pure transverse plan, the metatarsals are regularly adducted, and the rearfoot is normally positioned under the ankle joint and the leg (Figure 1). Therefore, the pure transverse plane deformity at Lisfranc's joint without other abnormalities of the foot is called metatarsus adductus [8]. However, the adduction of the forefoot could be associated to valgus of the hind foot for many reasons, and promote the aspect of skewfoot or Z-shaped foot. Berg [9] extended the radiographic study of 124 feet with metatarsus adductus and devised the simple metatarsus adductus (51 feet), the complex metatarsus adductus, when the midfoot is laterally translated (42 feet), the simple skewfoot when the hindfoot is valgus (16 feet) and the complex skewfoot when the midfoot is translated laterally and the hindfoot is in valgus (15 feet). Simple metatarsus adductus could be considered as the third deformity in clubfoot, since clubfoot exhibit two other abnormalities with significant varus of the rearfoot and equinus at the ankle.