Cho Mingoo, Han Jun-Sang, Kang Sungwook, Ahn Chang-Hwan, Kim Dong-Hee, Kim Chul-Hyun, Kim Kyoung-Tae, Kim Ae-Ryoung, Hwang Jong-Moon
Precision Mechanical Process and Control R&D Group, Korea Institute of Industrial Technology, Jinju-si 52845, Republic of Korea.
Department of Rehabilitation Medicine, Kyungpook National University Hospital, Daegu 41944, Republic of Korea.
Bioengineering (Basel). 2023 Sep 7;10(9):1051. doi: 10.3390/bioengineering10091051.
This study used the finite element method(FEM) to investigate how pressure on the lumbar spine changes during dynamic movements in different postures: standing, erect sitting on a chair, slumped sitting on a chair, and sitting on the floor. Three load modes (flexion, lateral bending, and axial rotation) were applied to the FEM, simulating movements of the lumbar spine. Results showed no significant difference in pressure distribution on the annulus fiber and nucleus pulposus, representing intradiscal pressure, as well as on the cortical bone during movements between standing and erect sitting postures. However, both slumped sitting on a chair and sitting on the floor postures significantly increased pressure on the nucleus pulposus, annulus fibrosus, and cortical bone in all three movements when compared to standing or erect sitting on a chair. Notably, sitting on the floor resulted in even higher pressure on the nucleus pulposus and annulus fibers compared to slumped sitting on a chair. The decreased lumbar lordosis while sitting on the floor led to the highest increase in pressure on the annulus fiber and nucleus pulposus in the lumbar spine. In conclusion, maintaining an erect sitting position with increased lumbar lordosis during seated activities can effectively reduce intradiscal pressure and cortical bone stress associated with degenerative disc diseases and spinal deformities.
本研究采用有限元方法（FEM），以探究在站立、直坐在椅子上、瘫坐在椅子上以及坐在地板上这几种不同姿势的动态运动过程中，腰椎所受压力是如何变化的。对有限元模型施加了三种载荷模式（前屈、侧屈和轴向旋转），以模拟腰椎的运动。结果显示，在站立和直坐姿势之间的运动过程中，代表椎间盘内压力的纤维环和髓核以及皮质骨上的压力分布没有显著差异。然而，与站立或直坐在椅子上相比，瘫坐在椅子上和坐在地板上这两种姿势在所有三种运动中均显著增加了髓核、纤维环和皮质骨上的压力。值得注意的是，与瘫坐在椅子上相比，坐在地板上会使髓核和纤维环承受更高的压力。坐在地板上时腰椎前凸减小，导致腰椎纤维环和髓核上的压力增加幅度最大。总之，在坐姿活动期间保持腰椎前凸增加的直坐姿势，可有效降低与椎间盘退变疾病和脊柱畸形相关的椎间盘内压力和皮质骨应力。
