Table 1. Patient Demographics.
| Variable | Acceptable (n = 286) | Outlier (n = 48) | p-value* |
|---|---|---|---|
| Sex (male:female) | 23 : 263 | 4 : 44 | 0.378 |
| Age (yr) | 70.2 ± 9.0 | 71.0 ± 8.0 | 0.476 |
| Body mass index (kg/m2) | 27.05 | 29.41 | 0.113 |
| Preoperative ROM | 129.3 ± 19.2 | 127.5 ± 15.7 | 0.421 |
| Mean MA (°) | 11.7 ± 7.0 | 11.4 ± 6.1 | 0.526 |
| Immediate postoperative MA (°) | 0.7 ± 1.7 | 3.5 ± 4.5 | 0.000 |
| Follow-up duration (yr) | 10.0 ± 0.5 | 10.3 ± 0.6 | 0.741 |
| Etiology | |||
| Osteoarthritis | 272 (95.1) | 46 (95.8) | 0.511 |
| Rheumatoid arthritis | 8 (2.8) | 1 (2.1) | 0.120 |
| Others | 6 (2.1) | 1 (2.1) | 0.273 |
| Implant type | |||
| Nexgen CR | 72 (26) | 11 (23) | 0.422 |
| Nexgen PS | 92 (32) | 16 (33) | 0.742 |
| E.motion CR | 122 (42) | 21 (44) | 0.676 |
Values are presented as mean ± standard deviation or number (%).
ROM: range of motion, MA: mechanical axis, CR: cruciate retaining, PS: posterior stabilized.
*Independent t-test. The p-values are of intergroup comparisons. Statistical significance was considered when p-values were below 0.05.