Table I.
A statistical comparisons of outcomes between the robotic arm-assisted surgery and manual surgery at five years.
| Variable | Robotic arm-assisted (n = 55) | Manual (n = 49) | p-value |
|---|---|---|---|
| Median American Knee Society Score (IQR) | |||
| Objective, 0 to 100 | 89 (80 to 97) | 88 (83.75 to 98) | 0.817* |
| Function, 0 to 100 | 80 (60 to 90) | 90 (70 to 90) | 0.636* |
| Total, 0 to 200 | 167 (139.75 to 185) | 177 (145 to 188.25) | 0.532* |
| Median Oxford Knee Score, 0 to 48 (IQR) | 40 (35 to 44) | 41 (34.75 to 44) | 0.812* |
| Mean pain VAS, 0 to 100 (SD) | 18.6 (22.6) | 15.9 (22.8) | 0.454* |
| Mean stiffness VAS, 0 to 100 (SD) | 19.1 (22.3) | 23.1 (26.4) | 0.443* |
| Median Forgotten Joint Score, 0 to 100 (IQR) | 50 (22.9 to 85.4) | 52.0 (28.1 to 72.9) | 0.784* |
| Median EQ-5D-3L, -0.594 to 1 (IQR) | 0.72 (0.587 to 1) | 0.8 (0.69 to 1) | 0.353* |
| Mean EQ-5D VAS, 0 to 100 (SD) | 80.3 (16.4) | 76.3 (18.2) | 0.316* |
| Median Pain Catastrophizing Scale, 0 to 10 (IQR) | 1 (0 to 10) | 0 (0 to 7.5) | 0.555* |
| Median ROM, ° (IQR) | 122.5 (115 to 130) | 120 (120 to 130) | 0.856* |
| Median five years to preoperative ROM change, ° (IQR) | 10 (3.75 to 20) | 5 (0 to 20) | 0.208* |
| Revisions, n | 0 | 2 | 0.476† |
| All cause reintervention, n | 0 | 6 | < 0.001† |
*
Mann-Whitney U test.
†
Kaplan-Meier regression log-rank statistic.
EQ-5D, EuroQol-five dimension; EQ-5D-3L, EuroQol-five dimension three-level; IQR, interquartile range; ROM, range of motion; SD, standard deviation; VAS, visual analogue scale.