Abstract: Objective To apply the three dimensional reconstruction thoracolumbar pedicle anatomical parameters in spine surgery pedicle screw implantation. Methods 6 healthy specimen spines were chosen and three dimensional spine reconstruction was based on 2 mm CT scan of the spines. The anatomical parameters including length and angle parameters were calculated based on the three dimensional reconstruction images. Results The pedicle width of T₉～L4 was 4.68～8.70 mm, and increased gradually from T₉ to L4. But the pedicles width of T₁₂, L1 and L2 were smaller than the others. The pedicle height of T₉～L4 was 8.19～12.76 mm. There was no significant difference from T₉ to L4. The pedicle height of T₁₂ was the biggest among them. The pedicle transverse angle was from 6.26 º to 13.06 º and increased gradually from T₉ to L4. But for the pedicle sagittal angle, the difference is not obvious and most of them are in the range of ±5 º. Conclusion Three dimensional reconstruction and calculation of thoracolumbar pedicle can show the anatomical characteristics of the spine and provide evidence for individual pedicle screw implantation.

Key words: thoracolumbar vertebrae, pedicle, anatomy, three dimensions