Department of Radiology, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark.
Research and Innovation Unit of Radiology, University of Southern Denmark, Odense, Denmark.
Eur Radiol Exp. 2021 Apr 2;5(1):15. doi: 10.1186/s41747-021-00209-1.
Although dorsal/palmar tilt, radial inclination (RI), and ulnar variance (UV) are measurements commonly performed in wrist radiographs, the impact of forearm rotation on those measurements during the radiographic procedure is uncertain. Our aim was to determine the impact of supination and pronation on the reliability of measurements of tilt, RI, and UV.
Tantalum markers were inserted into the distal radius of 21 unfractured cadaver forearms. The forearms were radiographed in different degrees of supination and pronation. The exact degree of rotation was calculated with radiostereometric analyses. Tilt, RI, and UV were measured by two independent readers in a random and anonymised fashion. Association between forearm rotation and radiographic measurements was examined using linear regression.
Forearm rotation significantly impacted the radiographically measured tilt. One degree of supination and pronation respectively increased and decreased palmar tilt with 0.68° and 0.44°, observers 1 and 2, respectively. As opposed to observer 1, observer 2 found that RI was significantly impacted by rotation with a slope of 0.08. Ulnar variance was not significantly impacted by rotation with linear regression slopes of 0.01° (95% confidence interval [CI] - 0.02-0.05, p = 0.490) and 0.02° (95% CI - 0.02-0.07; p = 0.288), observer 1 and observer 2, respectively.
In unfractured forearms, the radiographically measured tilt was significantly affected by rotation. Palmar tilt increased with supination and decreased with pronation. Rotation significantly affected radial inclination, although of a magnitude that is probably not clinically relevant. No significant impact on UV was found.
尽管背侧/掌侧倾斜度、桡骨倾斜角（RI）和尺侧偏移（UV）是腕关节 X 光片中常用的测量指标，但在放射照相过程中前臂旋转对这些测量值的影响尚不确定。我们的目的是确定旋前和旋后对倾斜度、RI 和 UV 测量值的可靠性的影响。
将钽标记物插入 21 个未骨折的尸体前臂的远端桡骨。在前臂的不同旋前和旋后角度下进行 X 光拍摄。通过放射立体分析计算出确切的旋转角度。倾斜度、RI 和 UV 由两位独立的读者以随机和匿名的方式进行测量。使用线性回归检验前臂旋转与放射照相测量值之间的关系。
前臂旋转显著影响了 X 光片上测量的倾斜度。旋前和旋后各 1 度，观察者 1 和观察者 2 分别使掌侧倾斜增加 0.68°和 0.44°。与观察者 1 相反，观察者 2 发现 RI 明显受到旋转的影响，斜率为 0.08。尺侧偏移不受旋转影响，线性回归斜率分别为 0.01°（95%置信区间 [CI] - 0.02-0.05，p = 0.490）和 0.02°（95% CI - 0.02-0.07；p = 0.288），观察者 1 和观察者 2 分别如此。
在未骨折的前臂中，X 光片上测量的倾斜度受旋转影响显著。掌侧倾斜度随旋前而增加，随旋后而减小。旋转对桡骨倾斜度有显著影响，尽管其程度可能无临床意义。未发现 UV 有明显影响。
