Fig. 3

The graphs illustrate sagittal rotation in segments of the lower cervical spine (block C4-C7) during the extension of the entire cervical spine. Sagittal rotation (‘Rotation’, y-axis) of the individual motion segments of the lower cervical spine, set against cumulative sagittal rotation in the segment C4-C7 (i.e. the amount of extension in block C4-C7). The y-axis represents sagittal rotation (in degrees) of the individual motion segments of the lower cervical spine, while on the x-axis the cumulative sagittal rotation (in degrees) in C4-C7 is displayed. In Fig. 3A, an individual is depicted with observable motion, although no consistent pattern can be identified (S02, T1). In Fig. 3B, another individual is shown with minimal amount of cumulative motion, and the segments exhibit high variability in contributions, including instances of negative motion (S01, T2)