Department of Orthopaedic Surgery, Klinikum Dortmund, Beurhausstraße 40, 44137 Dortmund, Germany.
Department of Radiology, Klinikum Dortmund, Beurhausstraße 40, 44137 Dortmund, Germany.
Foot Ankle Surg. 2021 Dec;27(8):855-859. doi: 10.1016/j.fas.2020.11.003. Epub 2020 Nov 25.
The medial distal tibial angle (MDTA) is used for measurement of ankle alignment. Standard to measure MDTA is weightbearing mortise view. EOS imaging becomes more popular for limb alignment analysis using low-dose radiation. As MDTA might vary in EOS, comparison between both radiographic techniques has been performed.
MDTA was compared between both techniques in 43 cases by defining the mechanical tibial axis in different ways (X-ray low, EOS low, EOS high). For each method MDTA, intra- and interobserver reliability has been compared.
The correlation between the different methods were measured by ICC (intraclass coefficient) and were ICC 0.86 (X-ray low/EOS low), ICC 0.85 (X-ray low/EOS high) and ICC 0.97 (EOS low/EOS high). Intra- and interobserver reliability were in each case ICC > 0.95.
ICC showed a substantial to excellent agreement between all methods. EOS is appropriate to determine MDTA and can be used for assessment of coronar deformities of the distal tibia.
内侧胫骨远端角（MDTA）用于测量踝关节对线。测量 MDTA 的标准是负重跗骨位。EOS 成像由于其低剂量辐射，在肢体对线分析方面越来越受欢迎。由于 MDTA 在 EOS 中可能会发生变化，因此已经对两种放射技术进行了比较。
通过定义机械胫骨轴的不同方法（X 射线低、EOS 低、EOS 高），在 43 例中比较了两种技术的 MDTA。比较了每种方法的 MDTA 的观察者内和观察者间可靠性。
ICC（组内相关系数）测量了不同方法之间的相关性，分别为 ICC 0.86（X 射线低/EOS 低）、ICC 0.85（X 射线低/EOS 高）和 ICC 0.97（EOS 低/EOS 高）。观察者内和观察者间的可靠性在每种情况下均 ICC>0.95。
ICC 显示所有方法之间具有实质性到极好的一致性。EOS 适合确定 MDTA 并可用于评估胫骨远端的冠状畸形。
