Department of Orthopaedic Surgery, Mayo Clinic, Rochester, MN 55905, USA.
Skeletal Radiol. 2010 Sep;39(9):915-20. doi: 10.1007/s00256-010-0893-5. Epub 2010 Mar 1.
The purpose of this study was to test the hypothesis that a simple overlay device can be used on radiographs to measure radial head and neck height.
Thirty anteroposterior elbow radiographs from 30 patients with a clinical diagnosis of lateral epicondylitis were examined to measure radial head and neck height. Three methods using different points along the bicipital tuberosity as a landmark were used. Method 1 used the proximal end of the bicipital tuberosity, method 2 used the most prominent point of the bicipital tuberosity, and method 3 used a simple overlay device (SOD) template that was aligned with anatomic reference points. All measurements were performed three times by three observers to determine interobserver and intraobserver reliability.
Intraclass correlation coefficients revealed higher interobserver and intraobserver correlations for the SOD template method than for the other two methods. The 95% limits of agreement between observers were markedly better (-1.8 mm to +1.0 mm) for the SOD template method than for the proximal point method (-3.8 mm to +3.4 mm) or the prominent point method (-5.9 mm to +4.9 mm).
We found that the SOD template method was reliable for assessing radial head and neck height. It had less variability than other methods, its 95% limit of agreement being less than 2 mm. This method could be helpful for assessing whether or not the insertion of a radial head prosthesis has resulted in over-lengthening of the radius.
本研究旨在验证一个假设，即使用简单的叠加装置可以在 X 光片上测量桡骨头部和颈部的高度。
检查了 30 例临床诊断为外侧肱骨髁炎的患者的 30 张前后肘 X 光片，以测量桡骨头部和颈部的高度。使用三种不同的方法，均以肱二头肌结节为标志点。方法 1 使用肱二头肌结节的近端，方法 2 使用肱二头肌结节的最突出点，方法 3 使用与解剖参考点对齐的简单叠加装置 (SOD) 模板。所有测量均由三名观察者进行三次，以确定观察者间和观察者内的可靠性。
组内相关系数显示，SOD 模板法的观察者间和观察者内相关性均高于其他两种方法。观察者之间的 95% 一致性界限在 SOD 模板法中明显更好（-1.8 毫米至+1.0 毫米），而在近端点法（-3.8 毫米至+3.4 毫米）或突出点法（-5.9 毫米至+4.9 毫米）中则较差。
我们发现 SOD 模板法是评估桡骨头部和颈部高度的可靠方法。它的变异性小于其他方法，其 95%的一致性界限小于 2 毫米。这种方法有助于评估桡骨头假体的插入是否导致桡骨过度延长。
