Chen Yan Rong, Tang Jin Bo
Department of Hand Surgery, Hand Surgery Research Center, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China.
J Hand Surg Am. 2013 Aug;38(8):1513-9. doi: 10.1016/j.jhsa.2013.04.023. Epub 2013 Jun 21.
To investigate shifting of the contact center over the surfaces of 2 opposing bones of the distal radioulnar joint during forearm rotation.
We recruited 8 volunteers and used their right wrists. Serial computed tomography scans were obtained with the forearm at neutral position and 6 other positions of forearm rotation. We reconstructed 3-dimensional images and mapped contact regions of both the sigmoid notch and ulnar head by calculating the shortest distance between the 2 opposing bones. The center of contact was also defined and plotted against the distal radioulnar joint rotation to determine the sliding distance over the surfaces of the 2 bones.
During forearm rotation, the maximal sliding of the sigmoid notch over the ulnar head was 7.4 mm in forearm pronation and 9.2 mm in forearm supination, which occurred in volar-dorsal direction primarily. Sliding of the ulnar head over the sigmoid notch was more limited, measuring 4.7 mm during pronation and 2.3 mm during supination. Most of the motion occurred between 30° pronation and 60° supination. In the proximal-distal direction, the contact site of the sigmoid notch with the ulnar head translated distally 1.6 mm during pronation and proximally 0.7 mm during supination.
During forearm rotation, the sigmoid notch slides substantially against the ulnar head at each part of the forearm rotation arc. The sliding of the ulnar head over the sigmoid notch is smaller, most of which is at the range from moderate forearm pronation to slight supination. The contact site of the sigmoid notch with the ulnar head moves slightly distally during forearm pronation and proximally during supination.
The in vivo findings provide more detailed information and insight into distal radioulnar joint motion kinematics.
研究在前臂旋转过程中，桡尺远侧关节相对的两块骨头表面接触中心的移动情况。
我们招募了8名志愿者，使用他们的右手腕。在前臂处于中立位以及前臂旋转的其他6个位置时，进行连续计算机断层扫描。我们重建三维图像，并通过计算相对的两块骨头之间的最短距离，绘制出乙状切迹和尺骨头的接触区域。还定义了接触中心，并根据桡尺远侧关节的旋转情况进行绘制，以确定在两块骨头表面的滑动距离。
在前臂旋转过程中，乙状切迹在尺骨头上的最大滑动在前臂旋前时为7.4毫米，在前臂旋后时为9.2毫米，主要发生在掌背方向。尺骨头在乙状切迹上的滑动更有限，旋前时为4.7毫米，旋后时为2.3毫米。大部分运动发生在旋前30°至旋后60°之间。在近端-远端方向上，乙状切迹与尺骨头的接触点在旋前时向远端平移1.6毫米，在旋后时向近端平移0.7毫米。
在前臂旋转过程中，乙状切迹在整个前臂旋转弧的各个部分都在尺骨头上大幅滑动。尺骨头在乙状切迹上的滑动较小，大部分发生在适度前臂旋前到轻度旋后的范围内。乙状切迹与尺骨头的接触点在前臂旋前时向远端轻微移动，在旋后时向近端轻微移动。
这些体内研究结果为桡尺远侧关节运动学提供了更详细的信息和见解。
