Department of Radiology, University of California-Davis, 4860 Y Street, Suite 3100, Sacramento, CA, 95817, USA.
Department of Biomedical Engineering, University of California-Davis, Davis, CA, 95616, USA.
Skeletal Radiol. 2020 Feb;49(2):241-248. doi: 10.1007/s00256-019-03266-1. Epub 2019 Jul 9.
To describe the normal motion pattern at the midcarpal compartment during active radial-ulnar deviation of the wrist using dynamic MRI, and to determine the observer performance for measurements obtained in asymptomatic volunteers.
Dynamic MRI of 35 wrists in 19 asymptomatic volunteers (age mean 30.4 years, SD 8.6) was performed during active radial-ulnar deviation using a fast gradient-echo pulse sequence with 315 ms temporal resolution (acquisition time, 19 s). Two independent readers measured the transverse translation of the trapezium at the scaphotrapezium joint (STJ) and the capitate-to-triquetrum distance (CTD). Relationships between these measurements and laterality, sex, lunate type, and wrist kinematic pattern were evaluated.
At the STJ, the trapezium moved most in radial deviation, with an overall translation of 2.3 mm between ulnar and radial deviation. Mean CTD measurements were the greatest in ulnar deviation and varied 2.4 mm between ulnar and radial deviation. Mean CTD was greater in men than women in the neutral position (p = 0.019), and in wrists with type II lunate morphology during radial and ulnar deviation (p = 0.001, p = 0.014). There were no significant differences in trapezium translation or CTD with wrist laterality and kinematic pattern. Intraobserver and interobserver correlation coefficients were 0.97 and 0.87 for trapezium translation and 0.84 and 0.67 for CTD.
This study is the first to demonstrate the performance of dynamic MRI to quantify STJ motion and CTD. Dynamic MRI with a short acquisition time may be used as a tool to supplement static MRI in evaluation of the midcarpal compartment.
使用动态 MRI 描述手腕主动桡偏-尺偏时腕中关节的正常运动模式，并确定在无症状志愿者中测量所得的观察者表现。
对 19 名无症状志愿者（年龄平均 30.4 岁，标准差 8.6 岁）的 35 个腕关节进行动态 MRI 检查，使用快速梯度回波脉冲序列在主动桡偏-尺偏时进行检查，时间分辨率为 315ms（采集时间 19s）。两位独立的观察者测量了舟月关节（STJ）处的梯形骨横向平移和头状骨-三角骨距离（CTD）。评估这些测量值与侧别、性别、月骨形态和腕关节运动模式之间的关系。
在 STJ 处，梯形骨在桡偏时移动最大，尺偏和桡偏之间总平移为 2.3mm。CTD 的平均测量值在尺偏时最大，尺偏和桡偏之间变化 2.4mm。在中立位时，男性的平均 CTD 大于女性（p=0.019），在桡偏和尺偏时具有 II 型月骨形态的腕关节中也更大（p=0.001，p=0.014）。梯形骨平移或 CTD 与腕关节侧别和运动模式无显著差异。梯形骨平移的观察者内和观察者间相关系数分别为 0.97 和 0.87，CTD 分别为 0.84 和 0.67。
本研究首次证明了动态 MRI 定量评估 STJ 运动和 CTD 的性能。具有短采集时间的动态 MRI 可能可作为补充静态 MRI 评估腕中关节的工具。
