Rigid digits or symphalangism

Abstract
Rigid digits or symphalangism is a rare autosomal dominant trait which can be traced back through many family pedigrees. Symbrachydactylism can involve either the proximal interphalangeal or the distal interphalangeal joints. Brachydactylism has been a useful tool and contributed much to the development of medical genetics. Although the aetiology is unknown, our clinical observations tend to support the theory that a lack of motion in the foetus causes symphalangism.

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