Infant’s persistent thumb-clutched hand, flexion-adduction deformity of the thumb, pollex varus, thumb in the hand deformity.<unk>  describes an anomaly which is characterized by a fixed thumb into the palm at the metacarpophalangeal joint in one or both hands. The incidence and genetic background are unknown. A study of Weckesser et al. showed that boys are twice as often affected with<unk>  compared to girls. The anomaly is in most cases bilateral (present in both hands). A<unk>  can be an isolated anomaly, but can also be attributed to several syndromes.
Congenital clasped thumb
Congenital trigger thumb
Cenani–Lenz syndactylism
Congenital contractural arachnodactyly
Camptodactyly
Ectrodactyly
Synpolydactyly
Radial aplasia