Abstract

Histology and scanning electron microscopy were used to evaluate the rhesus monkey spinal unit following controlled compression. Indications of cortical and end plate damage to the compressed vertebral units were present on radiographs following testing, and more extensive damage was observed with microscopy. The cartilaginous end plate was separated from the underlying bone of the vertebral body. The superior body of the spinal unit was more severely damaged than the inferior body, due largely to the direction of compression loading. Even relatively low strain rates (8.89×10−5 m/s) should be considered detrimental to the integrity of the spinal unit based on the observations of this study.

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