Panjabi M, Abumi K, Duranceau J, Oxland T
Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, Connecticut.
Spine (Phila Pa 1976). 1989 Feb;14(2):194-200. doi: 10.1097/00007632-198902000-00008.
The human spinal column, devoid of musculature, is incapable of carrying normal physiologic loads. In an in vitro experiment, the effect of simulated intersegmental muscle forces on spinal instability was investigated. Intact and sequentially injured fresh lumbar functional spinal units were subjected to three-dimensional biomechanical tests with increasing muscle forces. With the application of muscle forces, range of motion (ROM) increased and neutral zone (NZ) decreased in flexion loading, while both ROM and NZ decreased in extension loading. In lateral bending, ROM and NZ were unaffected by the application of the muscle forces. In axial rotation, ROM decreased significantly, while NZ decrease was statistically insignificant. It was concluded that the action of the intersegmental muscle forces is to maintain or decrease intervertebral motions after injury, with the exception of the flexion ROM, which increased with the application of muscle forces. In addition, the study suggested that Neutral Zone is a better indicator of spinal instability than Range of Motion.
没有肌肉组织的人体脊柱无法承受正常的生理负荷。在一项体外实验中，研究了模拟节段间肌肉力量对脊柱稳定性的影响。对完整的和依次损伤的新鲜腰椎功能脊柱单元施加逐渐增加的肌肉力量进行三维生物力学测试。施加肌肉力量时，在屈曲负荷下活动范围（ROM）增加而中性区（NZ）减小，而在伸展负荷下ROM和NZ均减小。在侧方弯曲时，ROM和NZ不受肌肉力量施加的影响。在轴向旋转时，ROM显著减小，而NZ减小在统计学上不显著。得出的结论是，节段间肌肉力量的作用是在损伤后维持或减小椎间运动，但屈曲ROM除外，其随肌肉力量的施加而增加。此外，该研究表明中性区比活动范围是更好的脊柱不稳定指标。
