Kolditz D, Krämer J, Gowin R
Z Orthop Ihre Grenzgeb. 1985 Mar-Apr;123(2):235-8. doi: 10.1055/s-2008-1045141.
The human intervertebral disc acts as an osmotic system. Water, salt and other low-molecular substances penetrate the cartilage plates and anulus fibrosus. The content of water, sodium, potassium and ashes in different regions of 69 human lumbar intervertebral discs was examined before and after loading them with certain weights. Under load the disc looses water - anulus 11%, nucleus 8% - and gains sodium and potassium. The higher concentration of electrolytes in the disc after a long period of weight-bearing enlarge its osmotic absorptive forces and enable the disc to hold the rest-water also against a great amount of pressure. After reducing the pressure water is quickly reabsorbed and the disc gains height and volume. The pumping mechanism keeps up the nutrition and biomechanical function of the intervertebral disc.
人类椎间盘起着渗透系统的作用。水、盐和其他低分子物质可穿透软骨终板和纤维环。在对69个人类腰椎间盘的不同区域施加一定重量前后，检测了其水、钠、钾和灰分的含量。在负荷作用下，椎间盘会失水——纤维环失水11%，髓核失水8%——并增加钠和钾的含量。长时间负重后椎间盘内较高浓度的电解质会增大其渗透吸收力，使椎间盘即使在承受大量压力的情况下也能留住剩余的水分。减压后，水分会迅速被重新吸收，椎间盘的高度和体积会增加。这种抽吸机制维持着椎间盘的营养和生物力学功能。
