Three-Dimensional Motion Analysis of the 2nd Cervical Spinous Process at End Range Cervical Rotation in Different Scapular Positions Using 3D Digitizer

Figure 2

Analysis of C2 displacement at end range cervical rotation. The diagram in the upper section presents the data from one of the subjects analyzed with 3D coordinates consisting of both mastoid processes, C2 spinous process, and additional lines constructed by the modelling software. C2 displacement was calculated as the change in distance between the left mastoid process and the point of intersection from a perpendicular line drawn from the C2 spinous process to a line drawn between both mastoid processes, comparing the neutral position and each end range cervical rotation position. D1: C2 displacement at end range cervical left rotation. D2: C2 displacement at neutral position. D3: C2 displacement at end range cervical right rotation.