Robertson Douglas D, Sharma Gulshan B, McMahon Patrick J, Karas Spero G
Emory Orthopaedics and Spine Center, Atlanta, Georgia, USA.
Author deceased.
Orthop J Sports Med. 2022 May 10;10(5):23259671221083589. doi: 10.1177/23259671221083589. eCollection 2022 May.
To improve spatial resolution, current clinical shoulder cross-sectional imaging studies reduce the field of view of the shoulder, excluding the medial scapula border and preventing glenoid version measurement according to the Friedman method.
To evaluate a method to accurately and reliably measure glenoid version on cross-sectional shoulder images when the medial scapula border is not included in the field of view, and to establish measurements equivalent to the Friedman method.
Controlled laboratory study.
Sixty-five scapulae underwent computed tomography (CT) scanning with an optimal shoulder CT-positioning protocol. Glenoid version was measured on CT images of the full scapula using the Friedman method. We developed a measurement method (named the Robertson method) based on the glenoid vault version from partial scapula images, with a correction angle subtracted from the articular-surface-glenoid vault measurement. Comparison with the Friedman method defined the accuracy of the Robertson method. Three observers tested inter- and intraobserver reliability of the Robertson method. Accuracy was statistically evaluated with tests and reliability with the intraclass correlation coefficient (ICC).
The statistical distribution of glenoid version was similar to published data,-0.5° ± 3° [mean ± SD]. The initial measurement using the Robertson method resulted in a more retroverted angle compared with the Friedman method, and a correction angle of 7° was then applied. After this adjustment, the difference between the 2 methods was nonsignificant (0.1° ± 4°; > .65). Reliability of the Robertson method was excellent, as the interrater ICC was 0.77, the standard error of measurement (SEM) was 1.1° with < .001. The intrarater ICC ranged between 0.84 and 0.92, the SEM ranged between 0.9° and 1.2° with < .01.
A validated glenoid version measurement method is now available for current clinical shoulder CT protocols that reliably create Friedman-equivalent values.
Friedman-equivalent values may be made from common clinical CTs of the shoulder and compared with prior and future Friedman measurements of the scapula.
为提高空间分辨率，当前临床肩部横断面成像研究缩小了肩部的视野范围，排除了肩胛骨内侧缘，从而无法按照弗里德曼方法测量关节盂倾斜度。
评估一种在视野中不包含肩胛骨内侧缘时，能在肩部横断面图像上准确可靠地测量关节盂倾斜度的方法，并建立与弗里德曼方法等效的测量方法。
对照实验室研究。
65个肩胛骨采用最佳肩部CT定位方案进行计算机断层扫描（CT）。使用弗里德曼方法在完整肩胛骨的CT图像上测量关节盂倾斜度。我们基于部分肩胛骨图像的关节盂穹窿倾斜度开发了一种测量方法（称为罗伯逊方法），从关节面 - 关节盂穹窿测量值中减去一个校正角。与弗里德曼方法比较确定了罗伯逊方法的准确性。三名观察者测试了罗伯逊方法的观察者间和观察者内可靠性。用检验统计评估准确性，用组内相关系数（ICC）评估可靠性。
关节盂倾斜度的统计分布与已发表数据相似，为-0.5°±3°[平均值±标准差]。与弗里德曼方法相比，使用罗伯逊方法进行的初始测量得出的角度更后倾，随后应用了7°的校正角。调整后，两种方法之间的差异无统计学意义（0.1°±4°；P>.65）。罗伯逊方法的可靠性极佳，观察者间ICC为0.77，测量标准误差（SEM）为1.1°，P<.001。观察者内ICC在0.84至0.92之间，SEM在0.9°至1.2°之间，P<.01。
现在有一种经过验证的关节盂倾斜度测量方法，可用于当前临床肩部CT方案，该方法能可靠地得出与弗里德曼方法等效的值。
可以从常见的肩部临床CT中得出与弗里德曼方法等效的值，并与先前和未来的肩胛骨弗里德曼测量值进行比较。
