From: Fit to play: posture and seating position analysis with professional musicians - a study protocol
Spine parameter | |
Trunk length D (mm) | Spatial distance between the markers VP and DM |
Trunk length S (mm) | Spatial distance between the markers VP and SP |
Sagittal trunk decline (°) | Inclination of the trunk length D marked line from the perpendicular to the sagittal plane. Tilt anteriorly (negative values) = possible lordosis Tilt dorsally (positive values) = possible kyphosis |
Frontal trunk decline (°) | Inclination of the trunk length D marked line from the perpendicular to the frontal plane. Tilt anteriorly (negative values) = possible lordosis Tilt dorsally (positive values) = possible kyphosis |
Axis decline (°) | Deviation of the line of the area marked by the trunk length D line of the 90 ° rotated distance DL-DR →decline between upper body and pelvis |
Thoracic bending angle (°) | Deviation of the distance VP - KA from the perpendicular |
Lumbar bending angle (°) | Deviation of the distance KA - LA from the perpendicular |
Standard deviation lateral deviation (mm) | Root mean squared deviation of the median line of the distance VP - DM |
Maximal lateral deviation (mm) | Maximum deviation of the median line of the distance VP - DM Negative values = deviation to the left Positive values = deviation to the right |
Standard deviation rotation (°) | Root mean square deviation of surface rotation of the median line (torsion of the spinous processes of the spine) |
Maximal rotation (°) | Maximum positive or negative surface rotation on the median line |
Kyphosis angle (°) | In the sagittal plane measured angle between the upper inflection point of the spine at the thoracolumbar and VP inflection point IP; point of greatest negative surface decline |
Lordosis angle (°) | Angle between the inflection point at DM and the thoracolumbar inflection point IP |
Pelvis parameter | |
Pelvis distance (mm) | Spatial distance between SIPS L and SIPS R. |
Pelvis height (°) and (mm) | Decline of the connecting line between SIPS L and SIPS R to the horizontal in the frontal plane in degrees and millimeter |
Pelvis torsion (°) | Angle between the surface normal on the two dimples SIPS L and SIPS R Negative differential angle = Normal at point SIPS L is stronger upward as at point SIPS R Positive difference angle = Normal at point SIPS L is stronger downward as at point SIPS R. |
Pelvis rotation (°) | Rotation of the distance SIPS L – SIPS R in the transversal plane |
Shoulder parameter | |
Scapular distance (mm) | Distance between the left (AISL) and the lower right scapular angle (AISR). |
Scapular height (°) | Height difference between the points AISL and AISR Positive value = AISR higher than AISL Negative value = AISR deeper than AISL |
Scapular rotation (°) | Rotation of the distance DL-DR in the transversal plane |
Scapular angle left (°) / Scapula angle right (°) | Best fit straight line on the shoulders to the horizontal. The center point of the regression line is set vertically above AISL / AISR. The greater the angle, the more caudally located the shoulder. |