Am J Vet Res. 2021 Jun;82(6):435-448. doi: 10.2460/ajvr.82.6.435.
To describe methods to measure the 3-D orientation of the proximal, diaphyseal, and distal segments of the canine radius by use of computer-aided design software (CADS) and to compare the repeatability and reliability of measurements derived by those methods.
31 canine radii with biapical deformities and 24 clinically normal (control) canine radii.
Select CT scans of radii were imported into a CADS program. Cartesian coordinate systems for the humerus and proximal, diaphyseal, and distal radial segments were developed. The orientation of each radial segment in the frontal, sagittal, and transverse planes was measured in triplicate by 3 methods. The repeatability and reliability of those measurements were calculated and compared among the 3 measurement methods.
The mean ± SD within-subject repeatability of radial angular measurements for all 3 methods was 1.40 ± 0.67° in the frontal plane, 3.17 ± 2.21° in the sagittal plane, and 3.01 ± 1.11° in the transverse plane for control radii and 2.56 ± 1.95° in the frontal plane, 3.59 ± 2.39° in the sagittal plane, and 3.47 ± 1.19° in the transverse plane for abnormal radii. Mean ± SD bias between radial measurement methods was 1.88 ± 2.07° in the frontal plane, 6.44 ± 6.80° in the sagittal plane, and 2.27 ± 2.81° in the transverse plane.
Results indicated that use of CADS to assess the 3-D orientation of the proximal, diaphyseal, and distal segments of normal and abnormal canine radii yielded highly repeatable and reliable measurements.
描述使用计算机辅助设计软件（CADS）测量犬桡骨近侧、骨干和远侧段三维方向的方法，并比较这些方法得出的测量值的重复性和可靠性。
31 根具有双尖畸形的犬桡骨和 24 根临床正常（对照）犬桡骨。
选择桡骨的 CT 扫描图像导入 CADS 程序。为肱骨和近侧、骨干和远侧桡骨段开发了笛卡尔坐标系。通过 3 种方法重复测量每个桡骨段在额状面、矢状面和横断面上的方向 3 次。计算并比较了这 3 种测量方法的测量值重复性和可靠性。
对于所有 3 种方法，控制桡骨在额状面、矢状面和横断面的桡骨角度测量的平均（±SD）个体内重复性分别为 1.40±0.67°、3.17±2.21°和 3.01±1.11°，异常桡骨分别为 2.56±1.95°、3.59±2.39°和 3.47±1.19°。3 种桡骨测量方法之间的平均（±SD）偏差为额状面 1.88±2.07°、矢状面 6.44±6.80°和横断面 2.27±2.81°。
结果表明，使用 CADS 评估正常和异常犬桡骨近侧、骨干和远侧段的三维方向可获得高度可重复和可靠的测量值。
