Polydactyly is the presence of one or more extra fingers on the hand. An additional finger might be small and nonfunctional — made of only skin and soft tissue or might be full-fledged with bones of its own. Most generally, an extra finger is adjacent to the thumb or little finger. Once in a while, an additional finger is between different fingers.
Polydactyly frequently runs in families and is sometimes connected with other ailments or conditions. In some cases, babies born with polydactyly will have syndactyly as well.
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Limb Deficiencies
A baby with a upper limb deficiency might be born with hands or arms that are more smaller than normal or are missing. Some of the more common limb deficiencies are depicted underneath.
Radial deficiency
In a radial deficiency, the radius bone and soft tissues of the forearm fail to develop properly. This makes the impacted hand be twisted inward toward the thumb side of the forearm, providing it with the appearance of a "club hand." The forearm may likewise be shortened and the thumb might be smaller and weaker than normal or missing — a condition known as "thumb hypoplasia."
A few kinds of radial deficiency run in families, while others are connected with congenital differences in the heart, kidneys, and blood system. To determine whether a radial deficiency is brought about by a medical condition, your doctor might recommend a thorough assessment by a pediatrician as well as a geneticist.
Transverse Deficiency
In a traverse deficiency, each of the elements under a specific level in the patient's arm are missing. The condition has an appearance like that of an amputation and is in some cases known as "congenital amputation."
Specialists believe that a traverse deficiency happens when a vascular issue, for example, a blood clot in the limb, makes the affected arm to stop developing. The most common type of traverse deficiency is one in which the elements underneath the elbow are missing.
Amniotic Band Syndrome
The amnion is the film that encompasses and protects the developing child. If the amnion breaks or tears during pregnancy, it is feasible for detached strands of the film to wrap over the developing child's body parts and cause injury — a condition known as amniotic band syndrome (ABS).
In milder cases, these strands, which are designated "amniotic bands," may cause just a minor groove or indentation in one of the baby's fingers or limbs.
In the most serious cases, an amniotic band might be sufficiently enough to restrict blood flow to the developing child's body parts. This can prompt the removal of fingers or parts of the arm before the child is born.
ABS is likewise sometimes known as early amnion rupture sequence (EARS), constriction band condition, or Streeter's dysplasia.