2/28/2023 0 Comments Short thumbs![]() Journal of Medical Genetics, 37, 292-296. Clinical and radiological assessment of a family with mild brachydactyly type A1: The usefulness of metacarpophalangeal profiles. Nonincisional osteotomy for gradual lengthening by callus distraction in the hand and foot. Arata, J., Morimoto, N., Soeda, H., Kometani, A., Abe, S., & Suzuki, S.You can learn more about how we ensure our content is accurate and current by reading our editorial policy. Healthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. These are the bones in the hands and feet that are third and fourth from the end of the digits. It is characterized by shortened metacarpals and metatarsals. Type E brachydactyly is a rare form if it is not accompanied by another disorder. The end bones of the thumbs are shortened but all the fingers are normal. Type D brachydactyly is considered to be common and affects only the thumbs. The middle phalanges, as in type A, are shortened, but the ring finger is often not affected and is the longest finger on the hand. Type C is rare and affects the index, middle, and little fingers. The thumb bones are always intact but often flattened and/or split. ![]() The last bone on each finger is shortened or completely missing. Type B brachydactyly affects the ends of the index through little fingers. Type A3: Only the little finger is shortened.Type A2: The index finger and sometimes the little finger are shortened.Type A1: The middle phalanges of all the fingers are shortened.Type A is further classified by finger types. These are the finger bones that are the second from the end of each digit. Type A brachydactyly is the shortening of the middle phalanges. The different types of brachydactyly are categorized by the bones and digits affected.
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