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首页> 外文期刊>Journal of Hand Surgery. American Volume >The effect of the annular ligament on kinematics of the radial head.
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The effect of the annular ligament on kinematics of the radial head.

机译：环形韧带对the骨头运动学的影响。

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PURPOSE: There is evidence that the radial head translates during pronation and supination. This study measured radial head movement and the location of the pronation-supination axis of the forearm with and without the annular ligament. METHODS: Thirteen cadaveric arms were attached to a custom-built frame. Pronation and supination were achieved by actuation of the pronator teres and biceps tendons, respectively. Motion was captured by video cameras via marker arrays attached to the distal radius, distal ulna, humerus, and radial head. Three pronation-supination trials were performed with the annular ligament intact and the elbow positioned at 90 degrees . The sequence was repeated after transection of the annular ligament. RESULTS: The radial head traveled an average of 2.1 mm in the anteroposterior direction and 1.6 mm in the mediolateral direction during forearm rotation. After annular ligament resection, travel of the radial head increased by an average of 44% in the mediolateral direction and by 24% in the anteroposterior direction. On average, the mean pronation-supination axis (screw displacement axis) passed 1.4 mm +/- 1.9 medial to the center of the capitellum and through the center of the ulnar head. Loss of the annular ligament did not change the location of the pronation-supination axis. CONCLUSIONS: During forearm rotation, the radial head travels to a greater extent in the anteroposterior direction than in the mediolateral direction. Loss of the stabilizing effect of the annular ligament increases the travel mediolaterally more than anteroposteriorly. The pronation-supination axis of the forearm is nearly constant and is not affected by annular ligament transection.
机译：目的：有证据表明pro骨头在旋前和旋后时会平移。这项研究测量了有无环状韧带时radial骨头的径向运动以及前臂的旋前-旋后轴的位置。方法：将十三具尸体臂固定到定制框架上。通过分别驱动前旋肌和二头肌腱来实现旋前和旋后。摄像机通过连接到radius骨远端，尺骨远端，肱骨和radial骨头的标记器阵列捕获运动。在环形韧带完整且肘部置于90度的情况下进行了3个旋前旋前试验。横切环形韧带后重复该过程。结果：在前臂旋转过程中，head骨头在前后方向平均移动2.1毫米，在中外侧方向平均移动1.6毫米。环形韧带切除后，the骨头的行进在中外侧方向上平均增加44％，在前后方向上平均增加24％。平均而言，平均旋前旋前轴（螺钉移位轴）通过1.4 mm +/- 1.9内侧，到达头颅中心并穿过尺骨中心。环形韧带的丢失并没有改变旋前-旋后轴的位置。结论：在前臂旋转过程中，head骨头在前后方向上的移动程度大于在前外侧方向上的移动。环形韧带的稳定作用的丧失增加了在中外侧的行程，而不是在前后增加的行程。前臂的旋前旋后轴几乎恒定，不受环形韧带横断的影响。

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