Analysis of Rabbit Intervertebral Disc Physiology Based on Water MetabolismII. Changes in Normal Intervertebral Discs under Axial Vibratory Load

摘要

Metabolic changes Induced by axial vibratory load to the spine were Investigated based on water metabolism in normal intervertebral discs of rabbits with or without pentobarbltal anesthesia. Tritiated water concentration in the intervertebral discs of unanesthetized rabbits was reduced remarkably by axial vibration for 30 minutes using the vibration machine developed for this study. Repeated vibratory load for 18 and 42 hours duration showed the recovery of3H2O concentration of the intervertebral disc without anesthesia. Computer simulation suggested a reduction of blood flow surrounding the Intervertebral disc following the vibration stress. However, no reduction of the3H2O concentration in the intervertebral disc was noted under anesthesia. Emotional stress cannot be excluded as a factor in water metabolism in the intervertebral disc.