TABLE II.
Effect of RCR on Driving Fitness When Performing Specific Maneuvers
| Maneuver | Kinematic Metric | Outcome | Baseline | Postoperative Week | |||
|---|---|---|---|---|---|---|---|
| 2 | 4 | 6 | 12 | ||||
| Straightaways (Events 8, 10, and 11) | Minimum longitudinal acceleration (g) | Mean* | 0.203 ± 0.007 | 0.202 ± 0.006 | 0.207 ± 0.006 | 0.207 ± 0.007 | 0.209 ± 0.007† |
| Estimated difference‡ | −0.018 (−0.037 to 0.001) | −0.013 (−0.032 to 0.006) | −0.004 (−0.023 to 0.015) | −0.29 (−0.048 to −0.010)† | |||
| Maximum lateral jerk (milli-g/sec) | Mean* | 1.6 ± 0.089 | 1.6 ± 0.098 | 1.6 ± 0.088 | 1.5 ± 0.087 | 1.4 ± 0.077† | |
| Estimated difference‡ | −0.053 (−0.190 to 0.080) | −0.051 (−0.180 to 0.080) | −0.038 (−0.090 to 0.17) | 0.220 (0.090 to 0.36)† | |||
| Left turns (Events 5, 6, and 7) | Maximum absolute lateral acceleration (g) | Mean* | 0.212 ± 0.006 | 0.216 ± 0.006 | 0.217 ± 0.005 | 0.217 ± 0.005 | 0.229 ± 0.005§ |
| Estimated difference‡ | −0.006 (−0.016 to 0.005) | −0.005 (−0.015 to −0.006)‡ | −0.005 (−0.016 to 0.006)‡ | −0.017 (−0.027 to −0.006)§ | |||
| Maximum absolute yaw (deg/sec) | Mean* | 26.2 ± 0.4 | 25.0 ± 0.4 | 24.8 ± 0.4† | 25.0 ± 0.4 | 25.3 ± 0.5 | |
| Estimated difference‡ | 1.1 (0.3 to 1.9) | 1.5 (0.7 to 2.3)† | 1.2 (0.4 to 2.0) | 0.9 (0.1 to 1.7) | |||
| Right turns (Events 12 and 14) | Maximum absolute yaw (deg/sec) | Mean* | 17.0 ± 0.3 | 17.2 ± 0.3 | 17.3 ± 0.3 | 18.1 ± 0.4 | 18.3 ± 0.3§ |
| Estimated difference‡ | −0.16 (−0.92 to 0.60) | −0.28 (−1.03 to 0.47) | −1.02 (−1.77 to −0.27) | −1.30 (−2.05 to −0.55)§ | |||
| Yields (Events 9 and 13) | Minimum longitudinal acceleration (g) | Mean* | −0.101 ± 0.009 | −0.075 ± 0.008 | −0.067 ± 0.009 | −0.081 ± 0.009 | −0.068 ± 0.009† |
| Estimated difference‡ | −0.027 (−0.049 to −0.004) | −0.034 (−0.057 to −0.012) | −0.020 (−0.042 to 0.003) | −0.033 (−0.056 to −0.011)† | |||
| Highway (on and off ramps) (Events 15 and 16) | Minimum longitudinal acceleration (g) | Mean* | −0.034 ± 0.010 | 0.000 ± 0.006† | 0.007 ± 0.006† | 0.011 ± 0.005† | 0.015 ± 0.0106† |
| Estimated difference‡ | −0.035 (−0.050 to −0.019)† | −0.041 (−0.057 to −0.025)† | −0.045 (−0.061 to −0.029)† | −0.048 (−0.064 to −0.033)† | |||
| Standard deviation of longitudinal acceleration (g) | Mean* | 0.064 ± 0.003 | 0.056 ± 0.003† | 0.053 ± 0.003† | 0.053 ± 0.003† | 0.053 ± 0.003† | |
| Estimated difference‡ | 0.008 (0.003 to 0.013)† | 0.011 (0.006 to 0.016)† | 0.011 (0.006 to 0.016)† | 0.011 (0.006 to 0.016)† | |||
| Maximum longitudinal jerk (milli-g/sec) | Mean* | 0.700 ± 0.039 | 0.640 ± 0.032 | 0.580 ± 0.033† | 0.610 ± 0.043 | 0.620 ± 0.039 | |
| Estimated difference‡ | 0.056 (−0.020 to 0.130) | 0.120 (0.040 to 0.190)† | 0.085 (0.010 to 0.160) | 0.079 (0.000 to 0.150)‡ | |||
| Maximum lateral jerk (milli-g/sec) | Mean* | 0.770 ± 0.038 | 0.750 ± 0.027 | 0.730 ± 0.033 | 0.680 ± 0.025† | 0.690 ± 0.026 | |
| Estimated difference‡ | 0.021 (−0041 to 0.080) | 0.039 (−0.024 to 0.100) | 0.094 (0.033 to 0.160)† | 0.080 (0.018 to 0.140) | |||
| Maximum absolute yaw (deg/sec) | Mean* | 8.5 ± 0.9 | 8.6 ± 0.9 | 8.7 ± 0.9 | 8.8 ± 0.9 | 9.3 ± 1.0§ | |
| Estimated difference‡ | −0.1 (−0.5 to 0.3) | −0.2 (−0.6 to 0.2) | −0.3 (−0.7 to 0.1) | −0.8 (−1.2 to −0.4)§ | |||
*
The values are given as the mean and the standard error. g = gravitational force equivalent.
†
Detectable differences in the conservative direction.
‡
The values are given as the estimated differences (baseline – postoperative), with the 95% CIs of kinematic metrics that showed a detectable difference when comparing baseline with postoperative drives within specific maneuver types.
§
Detectable differences in the reckless direction.