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Length, Tension And Tissue Pressure Relationships During Spinal Cord Distraction: An In-vitro Study

Spinal distraction during surgical procedures is a well-known cause of paresis. To determine whether the decreased blood flow noted in experimental distraction injury is related to elevated tissue pressures, we examined the in-vitro relationship of spinal cord tensile load, tissue pressure, and strain. We noted a linear relationship between tensile load and tissue pressure. Tissue pressures as high as 25 mmHg were possible with loads of 1250 gm. We conclude that cord distraction may cause tissue pressure elevations that may arrest microvascular circulation.