ObjectiveTo explore the changes of bloodstream around spinal cord under different axial spinal cord tensions in experimental pigs.MethodsThree male Guangxi white pigs were used for modeling. Intraoperative ultrasound was used to measure the diameter of spinal cord cross section and sagittal plane, spinal cord M-wave amplitude and time-intensity curve of bloodstream around spinal cord in porcine spinal cord original state, lumbar intervertebral space L_3/4 distraction 5 mm state and lumbar intervertebral space L_3/4 shortening 5 mm state, and the data were compared by paired t test.ResultsCompared with those in the original state of porcine spinal cord, in the distraction state the porcine spinal cord diameter was significantly smaller, the pulsation amplitude was significantly decreased, the perispinal bloodstream was significantly slower, the rising amplitude was significantly decelerated, and the blood perfusion was significantly decreased (all P < 0.05). Compared with the original state, in the shortening state the diameter of the spinal cord was significantly larger, the pulsation amplitude was significantly increased, the rising amplitude of bloodstream curve around the spinal cord was significantly slower, and the blood perfusion was significantly decreased (all P < 0.05).ConclusionThe changes of porcine spinal cord tension are related to the pulsatile amplitude of spinal cord and perispinal blood perfusion.