Biomechanics Research Laboratory, University of Michigan, G.G. Brown Building, 2350 Hayward St, Ann Arbor, MI, 48109, USA.
Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA.
Int Urogynecol J. 2024 Sep;35(9):1921-1926. doi: 10.1007/s00192-024-05912-2. Epub 2024 Sep 2.
Vaginal dimensions have clinical and surgical implications. We sought to quantify the differences between vaginal and labial dimensions in healthy ethnic Chinese and Western women with normal pelvic organ support.
This is a cross-sectional study of a convenience sample of ethnic Chinese nulliparas (n = 33) and Western nulliparas (n = 33) recruited for research purposes. For each subject, magnetic resonance imaging was used to quantify the vaginal and labial dimensions. Specifically, we identified the anterior and posterior vaginal wall, the outline of the cervix in the mid-sagittal and coronal planes, and the distance from the labia majora to the hymenal ring at the urethral meatus.
There were significant differences in age and weight between groups. Substantial variation in vaginal and labial dimensions was found within each group. The vaginal and labial dimensions of ethnic Chinese women ranged from 9-21% smaller than those of Western women; In the ethnic Chinese group, increasing weight and BMI correlated with greater labial distance (r = 0.66 and r = 0.63 respectively); as did height and the distance from the vaginal opening to the cervical os (r = 0.5). In the Western group, only weight correlated with the labial distance (r = 0.51).
Significant group differences in vaginal and labial dimensions were found, with the dimensions of Chinese nulliparas being up to 21% smaller than those of Western nulliparas.
阴道尺寸具有临床和手术意义。我们旨在量化具有正常盆腔器官支持的健康汉族和西方女性阴道和阴唇尺寸之间的差异。
这是一项对汉族初产妇（n=33）和西方初产妇（n=33）的便利样本进行的横断面研究。对于每个受试者，都使用磁共振成像来量化阴道和阴唇尺寸。具体来说，我们确定了阴道前壁和后壁、宫颈在中矢状面和冠状面的轮廓，以及大阴唇到尿道外口处女膜环的距离。
组间存在年龄和体重的显著差异。在每个组内都发现了阴道和阴唇尺寸的显著差异。汉族女性的阴道和阴唇尺寸比西方女性小 9-21%；在汉族组中，体重和 BMI 的增加与阴唇距离的增加相关（r=0.66 和 r=0.63）；身高和阴道开口到宫颈口的距离也与阴唇距离的增加相关（r=0.5）。在西方组中，只有体重与阴唇距离相关（r=0.51）。
发现了阴道和阴唇尺寸的显著组间差异，中国初产妇的尺寸比西方初产妇小 21%。
