Dupuis P R, Yong-Hing K, Cassidy J D, Kirkaldy-Willis W H
Spine (Phila Pa 1976). 1985 Apr;10(3):262-76. doi: 10.1097/00007632-198504000-00015.
A lumbar motion segment is considered to be unstable when it exhibits abnormal movement. This movement can be abnormal in quality (abnormal coupling patterns) or in quantity (abnormal increased motion). This instability can be symptomatic or asymptomatic, depending on the demands made on the motion segment. Pain is a signal of impending or actual tissue damage, and when present it indicates that a certain mechanical threshold has been reached or transgressed. Repeated transgressions will damage the stabilizing structures beyond physiologic repair, thus putting abnormal demands on secondary restraints. Radiographic study with dynamic views obtained in the frontal and lateral planes identify unstable states in the clinical environment.
当腰椎运动节段出现异常运动时，即被认为是不稳定的。这种运动在性质上（异常耦合模式）或数量上（异常的运动增加）可能是异常的。这种不稳定可能有症状，也可能无症状，这取决于对运动节段的要求。疼痛是即将发生或实际组织损伤的信号，当疼痛出现时，表明已经达到或超过了某个机械阈值。反复超过该阈值将使稳定结构受损，超出生理修复能力，从而对二级约束施加异常需求。在临床环境中，通过在正位和侧位平面获得的动态视图进行影像学研究，可识别不稳定状态。
