Symbrachydactyly

Symbrachydactyly

A hand affected by symbrachydactyly

Symbrachydactyly is a congenital anomaly characterized by the underdevelopment or absence of fingers and, in some cases, the bones of the hand. This condition is a type of limb malformation that occurs during fetal development, leading to a range of hand deformities. The severity of symbrachydactyly can vary significantly, from mild cases with slightly shortened fingers to severe cases where fingers are completely absent.

Classification

Symbrachydactyly is classified based on the extent and nature of the hand malformation:

• Short-finger type: This is the mildest form, where the fingers are present but shorter than normal. The thumb is usually well-formed.
• Cleft type: In this type, there are missing fingers, and the hand may have a cleft appearance.
• Peromelic type: This is the most severe form, where the hand is severely underdeveloped, and fingers may be completely absent.

Etiology

The exact cause of symbrachydactyly is not well understood. It is believed to result from a disruption in the blood supply to the developing limb during the early stages of pregnancy. This disruption can lead to the incomplete formation of the hand and fingers. Unlike some other congenital hand anomalies, symbrachydactyly is not typically associated with genetic syndromes or inherited in families.

Diagnosis

Symbrachydactyly is usually diagnosed at birth based on the physical appearance of the hand. In some cases, prenatal ultrasound may detect the condition before birth. Further evaluation may include X-ray imaging to assess the underlying bone structure and determine the extent of the malformation.

Treatment

Treatment for symbrachydactyly depends on the severity of the condition and the functional needs of the individual. Options may include:

• Surgical intervention: Surgery can be performed to improve hand function and appearance. This may involve reconstructive procedures, such as pollicization (creating a thumb from an existing finger) or the separation of webbed fingers.
• Prosthetics: In cases where fingers are absent, prosthetic devices can be used to enhance hand function.
• Occupational therapy: Therapy can help individuals develop adaptive techniques to perform daily activities and improve hand function.

Prognosis

The prognosis for individuals with symbrachydactyly varies depending on the severity of the condition and the success of any interventions. Many individuals with mild forms of the condition can lead normal, active lives with minimal limitations. Those with more severe forms may require ongoing therapy and adaptive strategies to maximize hand function.

Related pages

• Poland syndrome
• Congenital limb deformities
• Hand surgery