Table 2.
Three-Dimensional ROM, Extension to Flexion
| Follow-up (Months) | Rx Flex/Ext | Rotations (°) Ry Axial | Rz Lat Bend | Tx Lateral | Translation (mm) Ty Vertical | Tz AP |
|---|---|---|---|---|---|---|
| 1.5 | 2.5 | -0.1 | 0.1 | -0.2 | -0.1 | 0.3 |
| 3 | 5.6 | -0.6 | 0.5 | -0.2 | -0.4 | 1.5 |
| 6 | 6.6 | 0.2 | -0.2 | -0.1 | -0.9 | 2.6 |
| 12 | 6.3 | -0.4 | 0.2 | -0.1 | -1.2 | 2.4 |
The 3-dimensional ROM results of patients following ProDisc-L total disc replacement while moving from extension to fl exion measured using RSA technique. Rotational motion in the x-axis (Rx) corresponds to the primary motion for the plane of interest (sagittal plane); other rotations (Ry and Rz) are coupled motions.