Department of Otorhinolaryngology, Hospital Luz Arrabida, Praceta Henrique Moreira 150, 4400-346, VNGaia, Porto, Portugal.
Nova Medical School, Universidade Nova de Lisboa, Lisbon, Portugal.
Aesthetic Plast Surg. 2020 Dec;44(6):2244-2252. doi: 10.1007/s00266-020-01845-5. Epub 2020 Jul 6.
Improving the shape and contour of the nasal tip is a major goal in rhinoplasty. Extreme bulbosity and parenthesis deformity of the nasal tip are both frequently encountered. However, the underlying anatomical features that cause this kind of tip deformity are still not fully understood.
To evaluate the relation between the shape of the nasal tip and the anatomical position, orientation and shape of the lateral crura of the lower lateral cartilages and to estimate the incidence of cephalic malposition of lateral crura in Caucasian noses.
Nineteen Caucasian cadaver noses were studied, and the alar cartilages were measured and evaluated using a standardized method.
Fourteen of the total 38 lateral crura evaluated had cephalic malposition (long axis angle with the midline equal to or less than 30°). Of the nasal tips classified as having parenthesis deformity, 84.6% had cephalic malposition of lateral crura and 46.2% had convex lateral crura. Vertical orientation of the short axis of the lateral crura was no more common in noses with parenthesis deformity of the nasal tip than in other kinds of nasal tip.
The incidence of cephalic malposition of the lateral crura in this series of Caucasian noses was 36.8%. There was a statistically significant association between parenthesis deformity of the nasal tip and cephalic malposition of the lateral crura, as well as with convex shape of the lateral crura. No statistically significant association was found between the sagittal angle of the lateral crura and the type of nasal tip.
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改善鼻尖的形状和轮廓是鼻整形术的主要目标。鼻尖极度球状和括号样畸形是两种常见的鼻尖畸形。然而，导致这种鼻尖畸形的解剖学特征仍未被完全理解。
评估鼻尖的形状与下外侧软骨外侧脚的解剖位置、方向和形状之间的关系，并估计白种人鼻子中外侧脚的头侧错位发生率。
研究了 19 个白种人尸体鼻子，并使用标准化方法对鼻翼软骨进行了测量和评估。
在总共评估的 38 个外侧脚中，有 14 个（与中线的长轴角度等于或小于 30°）有头侧错位。在被分类为有括号样畸形的鼻尖中，84.6%有外侧脚的头侧错位，46.2%有外侧脚凸。与其他类型的鼻尖相比，鼻尖有括号样畸形的鼻子中，外侧脚短轴的垂直方向并不更常见。
在这一系列白种人鼻子中，外侧脚的头侧错位发生率为 36.8%。鼻尖的括号样畸形与外侧脚的头侧错位以及外侧脚的凸形有统计学显著的相关性。外侧脚的矢状角与鼻尖类型之间无统计学显著相关性。
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