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1·The reason lied mainly in the increased stress at the adjacent segment after surgery and the change of segmental motion pattern. Symptoms usually developed within the first 5 years after fusion.

病变原因主要是融合内固定术后相邻节段所受压力增加及节段运动模式改变而致退变。

2·Longitudinal displacement measures myocardial motion amplitudes in systole and visualizes the segmental velocity - time integrals.

纵向位移是测量收缩期心肌运动幅度，显现为心肌节段的速度-时间积分。

3·Objective To determine the center of left ventricular(LV) segmental wall motion using color tissue Doppler imaging at various scanning angles.

目的探讨不同扫查角度对彩色组织多普勒显像观察左室壁舒缩运动中心的影响。

4·These questions included patient selection issues, surgical accuracy of implantation, and existing evidence that motion preservation alters the natural history of spinal segmental degeneration.

这些问题包括病人淘汰、植入手术的精确性以及保留活动度后改变脊柱节段性退变自然病程的存在证据。