Table 4.
Joint motion surplus to end-range in quartiles. The quartiles of pro-directional surplus flexion and extension motion for joints C0/C1 to C6/C7. The motions were divided into quartiles of end-range motion, with the smallest end-range motion in quartile 1 and the largest end-range motion in quartile 4. Each quartile shows the pro-directional surplus motion in degrees and as a percentage of the associated end-range motion. The first column from the left shows quartiles, the second column shows motion direction, degrees and percentages and the next seven columns show joints C0/C1, C1/C2, C2/C3, C3/C4, C4/C5, C5/C6 and C6/C7, the last two columns show upper cervical joints C0/C3 and lower cervical joints C3/C7. The table is divided in two, with the upper half showing flexion motion and a lower half showing extension motion. The number of joints in each quartile is given in the bottom row of each half. The calculations for flexion of C5/C6 and C6/C7 included only 8 and 5 joints respectively. The smallest number of joint observations in the extension table was eight, seen at C0/C1
| Quartile | Flexion | C0C1 | C1C2 | C2C3 | C3C4 | C4C5 | C5C6 | C6C7 | C0C3 | C3C7 |
| 1 | Degrees | 2.20° | 4.36° | 4.13° | 1.96° | 2.50° | 1.68° | 2.73° | 3.56° | 2.22° |
| 1 | Percent | 200.70% | 204.06% | 359.44% | 92.64% | 93.97% | 37.43% | 75.65% | 254.73% | 74.92% |
| 2 | Degrees | 1.52° | 2.92° | 3.76° | 2.26° | 0.57° | 2.56° | 0.44° | 2.73° | 1.45° |
| 2 | Percent | 78.63% | 62.41% | 100.75% | 50.42% | 11.93% | 38.11% | 7.87% | 80.60% | 27.08% |
| 3 | Degrees | 1.91° | 4.35° | 1.18° | 1.44° | 1.49° | 1.25° | 0.38° | 2.48° | 1.14° |
| 3 | Percent | 69.01% | 61.71% | 21.16% | 25.61% | 20.38% | 11.61% | 4.04% | 50.62% | 15.41% |
| 4 | Degrees | 3.86° | 3.33° | 2.41° | 1.63° | 1.14° | 0.12° | 1.12° | 3.20° | 1.0° |
| 4 | Percent | 76.01% | 31.31% | 26.26% | 17.10% | 9.59% | 0.77% | 8.85% | 44.52% | 9.08% |
| Number of joints | 18 | 22 | 22 | 20 | 18 | 8 | 5 | 62 | 51 | |
| Quartile | Extension | C0C1 | C1C2 | C2C3 | C3C4 | C4C5 | C5C6 | C6C7 | C0C3 | C3C7 |
| 1 | Degrees | 2.38° | 4.53° | 3.37° | 1.51° | 1.25° | 0.99° | 1.49° | 3.43° | 1.31° |
| 1 | Percent | 184.00% | 171.05% | 232.31% | 89.68% | 33.89% | 29.69% | 137.52% | 195.85% | 72.69% |
| 2 | Degrees | 1.92° | 3.26° | 1.73° | 2.02° | 1.73° | 3.20° | 1.20° | 2.30° | 2.04° |
| 2 | Percent | 35.05% | 75.04% | 48.18% | 40.39% | 25.11% | 53.14% | 36.12% | 52.75% | 38.69% |
| 3 | Degrees | 0.96° | 2.64° | 2.88° | 1.61° | 0.77° | 2.39° | 1.22° | 2.16° | 1.45° |
| 3 | Percent | 8.55% | 40.16% | 46.93% | 22.44% | 7.31% | 28.85% | 27.24% | 31.88% | 21.46% |
| 4 | Degrees | 2.68° | 3.11° | 1.28° | 0.66° | 0.33° | 0.52° | 1.42° | 2.36° | 0.74° |
| 4 | Percent | 12.39% | 25.81% | 13.19% | 6.35% | 2.24% | 3.27% | 24.42 | 17.13% | 9.07% |
| Number of joints | 8 | 20 | 16 | 16 | 16 | 16 | 17 | 44 | 65 | |