Rizzi M A, DeSilva C N
Arch Orthop Unfallchir. 1976 Oct 25;86(2):219-26. doi: 10.1007/BF00415333.
The body's equilibrium is possible thanks to the integration of skeletal structure, vertebrae, ligaments and muscles to form one functional unity. The forces which determine posture are composed of two complementary systems, the ligamentary and the muscular systems, which together determine a dynamic act of balance. The ligaments operate mainly against the visco-hydraulic pressure of the nucleus pulposus and bind the vertebral bodies together, whereas the muscles exhibit an antigravity function and support spinal stability. A mathematical model based on a mixed theory of directed and oriented curves is proposed. Through this model it is possible to develop an exact theory governing the deformation of the ligamentous spine. This theory should be universal in the sense that it can be used to supply the spine in any of its environments.
人体的平衡得益于骨骼结构、椎骨、韧带和肌肉整合形成一个功能统一体。决定姿势的力量由两个互补系统组成，即韧带系统和肌肉系统，它们共同决定一种动态的平衡行为。韧带主要抵抗髓核的粘液压并将椎体连接在一起，而肌肉则发挥抗重力功能并维持脊柱稳定性。提出了一种基于定向和有向曲线混合理论的数学模型。通过该模型，有可能发展出一种精确的理论来支配韧带性脊柱的变形。从可以用于为处于任何环境中的脊柱提供依据的意义上来说，该理论应该具有通用性。
