多趾畸形

多趾畸形

多趾为足趾先天性畸形中最常见的畸形，常合并有并趾或其他先天性畸形，为常染色体遗传和多样表达。其总的发病率约为存活幼儿的2‰。

Polydactylyorpolydactylism,alsoknownashyperdactyly,isacongenitalphysicalanomalyinhumanshavingsupernumerarytoes.Polydactylyistheoppositeofoligodactyly(fewerfingersortoes).

Polydactylyisaconditioninwhichapersonhasmorethanfivefingersperhandorfivetoesperfoot.

Polydactylyisamedicaltermusedtodescribeextrafingersonthehandsortoesonthefeet.Sincetheextrafingersortoesarepresentatbirth,theyarecalledacongenitalanomaly.Theextrafingersortoesmaybesmallandnon-functional,inthecaseofnubbinsorskintags,ortheymaybefullyformedwithbonesandskeletalconnections.Extradigitscanexistindifferentplacesonthehandsandfeet.Iftheyareadjacenttothethumborbigtoe,theyarecalledpre-axialdigits.Iftheyareadjacenttothepinkyfingerortoe,theyarecalledpost-axialdigits.Extradigitscanalsobecentrallylocatedinthehandorfoot.Polydactylyoftenoccursbilaterally(onbothhandsorbothfeet),oritmayoccuronjustonehandorfoot.Similarly,apersonmayhaveextradigitsonjustthehands,justthefeet,orsomeother







































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