Aspden R M
Department of Medical Biophysics, University of Manchester, UK.
Clin Biomech (Bristol). 1987 Aug;2(3):168-74. doi: 10.1016/0268-0033(87)90010-6.
Intra-abdominal pressure has been suggested as a mechanism for reducing the compressive load on the spine. The cantilever model of the spine, on which the mechanism is based, is described and the nature of the intra-abdominal pressure response examined within this context. This model is also the basis for the proposal to use intra-abdominal pressure as an index of compressive stress on the spine, although the dependence on the model is not always acknowledged, and the validity of this approach is discussed. Experimental evidence relating intra-abdominal pressure to posture and loading is examined and compared with the predictions of the model and these are often found to disagree. A fundamental problem in spinal mechanics, that of explaining why the vertebrae are not crushed during the lifting of even relatively small loads, is shown to be unresolved. This suggests that a new model of the spine is required, within which there is a useful role for intra-abdominal pressure with the described characteristics. A model based on an analysis of the spine as an arch is proposed.
腹腔内压力被认为是一种减轻脊柱压缩负荷的机制。文中描述了该机制所基于的脊柱悬臂模型，并在此背景下研究了腹腔内压力反应的性质。该模型也是将腹腔内压力用作脊柱压缩应力指标这一提议的基础，尽管对该模型的依赖并非总是得到认可，且本文讨论了这种方法的有效性。文中研究了将腹腔内压力与姿势和负荷相关联的实验证据，并将其与模型预测进行比较，结果发现二者常常不一致。脊柱力学中的一个基本问题，即解释为何即使在举起相对较小负荷时椎骨也不会被压碎，仍未得到解决。这表明需要一个新的脊柱模型，在该模型中腹腔内压力具有所述特征并发挥有益作用。本文提出了一个基于将脊柱分析为拱形的模型。
