Skeletal Radiol. 2013 Dec;42(12):1711-5. doi: 10.1007/s00256-013-1728-y. Epub 2013 Sep 28.
In quantifying glenoid bone loss and as a means to determine initial glenoid size, the abnormal glenoid is often compared with the contralateral normal glenoid. The assumption is that good symmetry exists between both glenoid surfaces with regard to size and shape. The purpose of this study is to critically analyze the structural symmetry of both glenoids in an objective and quantitative manner to ascertain the degree of symmetry present.
The study cohort comprised 60 subjects (35 males and 25 females) with no shoulder pathology or injury. Each glenoid surface was extracted from the whole scapular model constructed from CT data using a 3D curvature-based incremental watershed algorithm. Glenoid morphometric analysiswas carried out based on the 2D contour of the glenoid projected on the principal plane.
There was no side-to-side difference in glenoid length (p =0.53), width (p =0.42), area (p =0.36), or circumference (p =0.73). All glenoid dimensions were larger in males than females (p <0.05). Point-wise curvature analysis showed no significant shape difference between both glenoids (all p >0.1). Regression analysis revealed a positive correlation (R²=0.3-0.5) between increasing age and increasing glenoid size.
In normal subjects, both glenoids are highly symmetric in shape and size. This study provides objective and quantitative justification for using the normal counterlateral glenoid as a reference standard for initial glenoid shape in patients with unilateral glenoid bone loss.
在量化肩盂骨丢失量并确定初始肩盂大小方面，常将异常肩盂与对侧正常肩盂进行比较。其假设是，双侧肩盂在大小和形状方面具有良好的对称性。本研究的目的是客观、定量地分析双侧肩盂的结构对称性，以确定其存在的对称程度。
研究队列包括 60 名受试者（35 名男性和 25 名女性），均无肩部疾病或损伤。使用基于 3D 曲率的增量分水岭算法，从 CT 数据构建的全肩胛骨模型中提取每个肩盂表面。根据在主平面上投影的肩盂 2D 轮廓进行肩盂形态分析。
肩盂长度（p=0.53）、宽度（p=0.42）、面积（p=0.36）和周长（p=0.73）在左右两侧无差异。男性的所有肩盂尺寸均大于女性（p<0.05）。逐点曲率分析显示，双侧肩盂之间没有明显的形状差异（所有 p>0.1）。回归分析显示，年龄与肩盂尺寸之间呈正相关（R²=0.3-0.5）。
在正常受试者中，双侧肩盂在形状和大小上高度对称。本研究为使用正常对侧肩盂作为单侧肩盂骨丢失患者初始肩盂形状的参考标准提供了客观和定量的依据。
