Table 2.
Comparison between the Non-Redislocation Group and the Redislocation Group
| Parameter | Non-redislocation group | Redislocation group | p-value |
|---|---|---|---|
| No. of patients | 9 | 9 | |
| Age (yr) | 66±10 | 64±10 | 0.960 |
| Sex (female/male) | 6/3 | 9/0 | 0.245 |
| Body mass index (kg/m2) | 25±7 | 26±5 | 0.213 |
| Direction of 1st bearing dislocation | |||
| Anterior | 4 | 5 | 0.343 |
| Posterior | 5 | 2 | 0.040 |
| Medial | 0 | 1 | 0.250 |
| Anterior & posterior | 0 | 1 | 0.250 |
| Bearing thickness (mm) | |||
| Index operationa) | 3 (3), 4 (4), 6 (2) | 3 (2), 4 (5), 5 (1), 6 (1) | 0.611 |
| Revisiona) | 4 (2), 5 (4), 6 (1), 7 (1), 9 (1) | 4 (5), 5 (1), 6 (1), 7 (2) | 0.693 |
| Thickness changeb) | 0 (1), 1 (4), 2 (3), 3 (1) | 0 (3), 1 (4), 2 (2) | 0.647 |
| Preoperative mechanical FTA (°)c) | 173.6±3.4 | 173.9±2.0 | 0.880 |
| Postoperative mechanical FTA (°)c) | 178.9±4.0 | 179.2±1.5 | 0.960 |
| Femoral implant coronal alignment (°)d) | −0.8±2.8 | −1.3±5.2 | 1 |
| Femoral implant sagittal alignment (°)d) | 5.6±7.6 | 1.0±7.2 | 0.238 |
| Tibial implant coronal alignment (°)d) | 1.2±2.3 | 1.9±1.0 | 0.275 |
| Tibial implant sagittal alignment (°)d) | 8.5±2.6 | 7.6±2.8 | 0.528 |
Values are presented as mean±standard deviation or number.
FTA: femorotibial angle.
a)
Values represent bearing thickness (no. of patients).
b)
Bearing thickness change between revision and index operation (no. of patients).
c)
A value of <180° means varus alignment; a value of >180° means valgus alignment.
d)
Positive value means varus or flexion of implant; negative value means valgus or extension of implant.