Congenital clasped thumb

Infant’s persistent thumb-clutched hand, flexion-adduction deformity of the thumb, pollex varus, thumb in the hand deformity.

Congenital clasped thumb 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 congenital clasped thumb compared to girls. The anomaly is in most cases bilateral (present in both hands). A congenital clasped thumb can be an isolated anomaly, but can also be attributed to several syndromes.