Experimental Evaluations for Compression Damage in White/Gray Matter of Bovine Spinal Cord

Abstract

In this study, the compression tests were performed for white and gray matter in cervical spinal cord of bovine to evaluate thire resistance against the compressive damage. Then the compressive damage rate C_d was measured on the basis of the compressive load-time diagrams. The value of C_d increased with increase in compresion rate D_R, and the C_d value in the gray matter was greater than the one in the white matter. The larger C_d was comfirmed in the longer compression holding time in D_R= 50%, while C_dvalues did not show large variation in D_R= 30 and 70%, becase the tissues exhibits the elastic state totally in D_R= 30% (small compression) and the elastic recovery did not occure in D_R= 70% because of the huge damage of the tissues. In the longer unloading holding time, C_dvalues became smaller becase of the visco-elastic behavior of these tissues.