Congenital clasped thumb or thumb-clutched (or clasped) hand, is characterized by marked flexion of the first metacarpo-phalangeal joint and adduction into the palm.

The syndrome has been classified into following subtypes

• Group I – Deficient extension only
• Group II – Deficient extension combined with flexion contracture
• Group III – Hypoplasia of the thumb associated with deficiencies of muscles and tendons
• Group IV – The few cases not falling in the first three groups.

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