Supernumerary digit

Supernumerary Digit

A supernumerary digit or polydactyly is a condition in which a person is born with more than the usual number of digits on their hands or feet. This condition is a type of congenital anomaly, which refers to any condition that is present at birth.

Causes

The exact cause of supernumerary digits is not known, but it is believed to be due to a combination of genetic and environmental factors. Some cases of supernumerary digits have been linked to specific genetic mutations, such as those in the GLI3 gene. However, in many cases, no specific genetic cause can be identified.

Types

There are several different types of supernumerary digits, which can vary in their appearance and location. These include:

• Postaxial polydactyly: This is the most common type of supernumerary digit, and involves an extra digit on the little finger side of the hand or the outer side of the foot.
• Preaxial polydactyly: This type involves an extra digit on the thumb side of the hand or the inner side of the foot.
• Central polydactyly: This type involves an extra digit in the middle of the hand or foot.

Treatment

The treatment for supernumerary digits depends on the type and severity of the condition. In some cases, no treatment may be necessary. In other cases, surgery may be performed to remove the extra digit. The goal of treatment is to improve function and appearance, and to prevent complications such as deformity or infection.

See also

• Congenital anomalies
• Genetic mutation
• GLI3
• Deformity
• Infection

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