Faculty of Health Sciences, Physical Therapy Department, University of Camilo José Cela, Madrid, Spain.
Departamento de Bioloxía Funcional e Ciencias da Saúde, Universidade de Vigo, 36005, Pontevedra, Spain.
J Ultrasound. 2024 Sep;27(3):479-485. doi: 10.1007/s40477-023-00818-z. Epub 2023 Sep 1.
The purpose of the study was to examine the reliability and validity of a single lateral condyle-capsule distance (LCCD) measurement while saving on economic costs and clinical resources.
A longitudinal test-retest design was used to assess the reliability and validity of single-examiner measures over 72 TMJ sonographic analyses. Intraclass correlation coefficients (ICC) and a Bland-Altman plot were used to study reliability and validity, comparing the first measurement of the LCCD to the mean of 3 measurements taken one week later by the same examiner.
ICC show intraobserver reliability of 0.981, 95% confidence intervals (CI) of 0.969 to 0.988. The mean difference between the ultrasound measurements is 0.019 mm (95% CI 0.0005-0.0383) with a standard deviation of 0.080 mm, demonstrating robust validity. The 95% Limits of Agreement (LoA) are - 0.138 for the lower limit and 0.177 for the upper. Mean relative error is 0.009 mm.
Intraobserver reliability of a trained examiner is very high in the single measurement of the LCCD and validity is significant compared to more complex methods. The risk of bias is low since the mean of three LCCD measurements is calculated as opposed to recording only one single measurement.
本研究旨在检验单次外侧髁-关节囊距离（LCCD）测量的可靠性和有效性，同时节省经济成本和临床资源。
采用纵向测试-再测试设计，对 72 例 TMJ 超声分析中单次检查的可靠性和有效性进行评估。使用组内相关系数（ICC）和 Bland-Altman 图来研究可靠性和有效性，将第一次 LCCD 测量与同一位检查者一周后进行的 3 次测量的平均值进行比较。
ICC 显示观察者内可靠性为 0.981，95%置信区间（CI）为 0.969 至 0.988。超声测量的平均差值为 0.019 毫米（95%CI 为 0.0005-0.0383），标准差为 0.080 毫米，具有较强的有效性。95%的一致性界限（LoA）下限为-0.138，上限为 0.177。平均相对误差为 0.009 毫米。
在单次 LCCD 测量中，经过培训的观察者的观察者内可靠性非常高，与更复杂的方法相比，有效性显著。由于计算了三个 LCCD 测量的平均值，而不是仅记录一个单一的测量，因此偏倚风险较低。
