Table 1 Nomenclature for parameters measured on CT reconstruction images
Measurement | Abbreviation | Descriptions |
|---|---|---|
Outer pedicle width | OPW | Outer mediolateral diameter of the pedicle isthmus measured from Axial CT image |
Inner pedicle width | IPW | Inner mediolateral diameter of the pedicle isthmus (the width of the cancellous core) measured from Axial CT image |
Outer pedicle height | OPH | Outer superoinferior diameter of the pedicle isthmus measured from Axial reconstruction image perpendicular to the longitudinal pedicle axis |
Inner pedicle height | IPH | Inner superoinferior diameter of the pedicle isthmus (cancellous core diameter) measured from Axial reconstruction image perpendicular to the longitudinal pedicle axis |
Pedicle transverse angle | PTA | The angle between the pedicle axis projection and the anatomical sagittal plane measured from Axial CT image |
Pedicle sagittal angle | PSA | The angle between the inferior endplate and longitudinal pedicle axis measured from Axial reconstruction image along the plane of longitudinal pedicle axis |