Department of Orthopedic Surgery, Dongsan Medical Center, School of Medicine, Keimyung University, Daegu, Republic of Korea.
Department of Orthopedic Surgery, Dongsan Medical Center, School of Medicine, Keimyung University, Daegu, Republic of Korea.
J Shoulder Elbow Surg. 2018 Feb;27(2):e45-e49. doi: 10.1016/j.jse.2017.09.028. Epub 2017 Nov 8.
The primary objective was to calculate and to apply the numeric value of the distance from the pectoralis major tendon insertion to the superior aspect of the humeral head (PMTD) without any radiation exposure or equipment through basic data such as age, sex, height, and weight of Asian populations.
We analyzed shoulder magnetic resonance images of 260 patients (107 men and 153 women; average age, 59.8 years). The superior border of the pectoralis major was identified on the transverse section and cross-referenced with the coronal section. Measurements were made inferiorly from the corresponding transverse section to the top of the humeral head superiorly in coronal view. Correlation analysis was performed between variables including the patient's age, sex, height, weight, and body mass index and the PMTD by multiple linear regression analysis.
The mean PMTD was 52 mm, with an average of 55 mm for men and 49 mm for women. Sex and height were significantly correlated with PMTD. The PMTD increased to a consistent level proportionally to height, and the difference in PMTD between men and women was 3.45 mm. An equation to estimate PMTD using these findings is as follows: PMTD (in mm) = 23 + (height [cm] × 0.17) + 3.45 (the last number is added for men). This equation had a prediction error of 0.3 mm.
Our study demonstrated that PMTD is a useful and reliable reference for optimal humeral height during hemiarthroplasty for proximal humerus fractures in Asian populations.
主要目的是通过亚洲人群的基本数据（年龄、性别、身高和体重）计算并应用胸大肌肌腱止点到肱骨头上方的距离（PMTD）的数值，而无需任何辐射或设备。
我们分析了 260 名患者（107 名男性和 153 名女性；平均年龄 59.8 岁）的肩部磁共振图像。在横断面上识别胸大肌的上缘，并与冠状面交叉参考。在冠状面上，从相应的横断面向下测量到肱骨头上部的最高点。通过多元线性回归分析对包括患者年龄、性别、身高、体重和体重指数在内的变量与 PMTD 之间进行相关性分析。
平均 PMTD 为 52mm，男性平均为 55mm，女性平均为 49mm。性别和身高与 PMTD 显著相关。PMTD 与身高成正比增加，男女之间的 PMTD 差异为 3.45mm。使用这些发现估计 PMTD 的方程如下：PMTD（mm）=23+（身高[cm]×0.17）+3.45（最后一个数字是为男性添加的）。该方程的预测误差为 0.3mm。
我们的研究表明，PMTD 是亚洲人群肱骨头骨折半髋关节置换术中确定最佳肱骨高度的有用且可靠的参考。
