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Thumb hypoplasia is a spectrum of congenital abnormalities No cartilage in thumb the thumb varying from small defects to absolute retardation of the thumb. Radial dysplasia is the condition in which the forearm bone and the soft tissues on the thumb side are underdeveloped or No cartilage in thumb. In an embryo the upper extremities develop from week four of the gestation. A syndrome is a combination of three or more abnormalities.

In general there are five types of thumb hypoplasia, originally described by Muller in and improved by Blauth, Buck-Gramcko and Manske. Both involve a less developed first metacarpal and a nearly absent thenar musculature. The limit between pollicization and reconstruction varies. Others say type IIIA is not suitable for reconstruction too.

In this group careful attention should be paid to anomalous tendons coming from the forearm extrinsic muscles, like an aberrant long thumb flexor — flexor pollicis longus. The cause is unknown, and likely related to genetic abnormalities. Children with Fanconi anemia can sometimes display hypoplasia of the thumb.

Three main points in diagnosing thumb hypoplasia are: width of the first web space, instability of the involved joints and function of the thumb. Therefore, a careful examination of both hands is important. When it comes to No cartilage in thumb it is important to differentiate a thumb that needs stability, more web width and function, or a thumb that needs to be replaced by the index finger.

It has been recommended that pollicization is performed before 12 months, but a long-term study of pollicizations performed between the age of 9 months and 16 years showed no differences in function related to age at operation.

It No cartilage in thumb important to know that every reconstruction of the thumb never gives a normal thumb, because there is always a decline of function. From Wikipedia, the free encyclopedia. Thumb Hypoplasia.

Congenital Thumb Deformities and Associated Syndromes. No cartilage in thumb Failure of Formation of the Upper Limb. The Pediatric Upper Limb. Reconstruction of the Hypoplastic Thumb. Retrieved Categories : Plastic surgery Congenital disorders Congenital disorders of musculoskeletal system Rare diseases Fingers. Namespaces Article Talk. Views Read Edit View history.

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