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臀先露概述

Author
G Justus Hofmeyr, MD
Section Editor
Charles J Lockwood, MD, MHCM
Deputy Editor
Vanessa A Barss, MD, FACOG
Translators
史精华, 主治医师

引言

臀先露是指胎儿的臀部临近产道。臀先露主要分为以下三类：

●单臀先露：胎儿双髋关节屈曲，双膝关节伸直，因而足部与胎儿头部接近(图 1)。足月时，约50%-70%的臀位胎儿处于此种状态。

●完全臀先露：胎儿双膝关节及双髋关节均屈曲(图 2)。足月时，约5%-10%的臀位胎儿处于此种状态。

●不完全臀先露：一侧或双侧髋关节不完全屈曲(图 3)。足月时，约10%-40%的臀位胎儿为不完全臀先露。

以一足或双足先露称为足式臀位。罕见情况下，一膝或双膝先露，称为膝式臀位。

                

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Literature review current through: 2017-06 . | This topic last updated: 2016-07-08.
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