OBSOLETE: Polydactyly of a triphalangeal thumb, unilateral

Polydactyly of a triphalangeal thumb (unilateral) is a rare congenital hand condition present at birth. In this condition, a person is born with an extra finger or an unusually shaped thumb on one hand. The term 'triphalangeal thumb' means the thumb has three bones (phalanges) instead of the usual two, making it look more like a finger than a typical thumb. 'Polydactyly' means having extra digits. When described as 'unilateral,' it means only one hand is affected. This specific Orphanet entry is marked as OBSOLETE, meaning it has been retired or merged into a broader or updated classification of thumb and digit abnormalities. The condition is typically noticed immediately at birth because the thumb appears longer than normal or an extra digit is visible. It can affect hand function, particularly grip strength and fine motor skills like pinching. Treatment usually involves surgical correction to improve both the appearance and function of the hand. Surgery is often performed in early childhood. Outcomes after surgery are generally good, especially when performed by an experienced pediatric hand surgeon. Physical or occupational therapy may be recommended after surgery to help the child develop normal hand function.

Bring these to your next appointment

• Q1.What is the best age for my child to have surgery?,What type of surgery will be needed, and what are the risks?,How will this affect my child's hand function long-term?,Should we pursue genetic testing to understand the cause?,Is there a chance our future children could have the same condition?,What kind of therapy will my child need after surgery?,Are there any activities my child should avoid before or after treatment?

Common questions about OBSOLETE: Polydactyly of a triphalangeal thumb, unilateral