Congenital thumb hypoplasia

Hypoplastic thumb is a short, underdeveloped thumb with deficient or absent intrinsic muscles with or without deficient extrinsic musculotendinous structures. Thumb hypoplasia is a common congenital abnormality with five types of increasing severity. This abnormality may be associated with local musculoskeletal deficiencies or systemic diseases and syndromes. In severe cases, basic hand function, including pinch and grasp, may be adversely affected. A variety of operative reconstructive procedures can provide thumb stability, and improve motor control and overall hand function.