Table 1.
Post-operative outcome measures and the difference relative to pre-operative scores for the all patients according to group
| Functional Measure | Increased Stiffness | Difference | 95% CI | p value* | |||
|---|---|---|---|---|---|---|---|
| Yes (n = 129) | No (n = 2460) | Lower | Upper | ||||
| WOMAC | |||||||
| Total | 1 year | 55.8 (22.4) | 75.7 (19.5) | 20.0 | 16.5 | 23.4 | < 0.001 |
| Change (95% CI) | 9.8 (6.9 to 12.7) | 39.7 (38.9 to 40.5) | 29.9 | 26.4 | 33.4 | < 0.001 | |
| p value** | < 0.001 | < 0.001 | |||||
| Pain | 1 year | 63.1 (24.0) | 81.0 (19.8) | 18.0 | 14.4 | 21.5 | < 0.001 |
| Change (95% CI) | 20.7 (16.9 to 24.5) | 46.0 (45.1 to 46.8) | 25.2 | 21.3 | 29.2 | < 0.001 | |
| p value** | < 0.001 | < 0.001 | |||||
| Function | 1 year | 55.4 (23.6) | 74.5 (20.7) | 19.1 | 15.4 | 22.8 | < 0.001 |
| Change (95% CI) | 10.1 (6.9 to 13.3) | 38.2 (37.4 to 39.0) | 28.1 | 24.2 | 31.7 | < 0.001 | |
| p value** | < 0.001 | < 0.001 | |||||
| Stiffness | 1 year | 41.0 (22.4) | 73.2 (21.3) | 32.3 | 28.5 | 36.0 | < 0.001 |
| Change (95% CI) | − 20.0 (17.9 to 22.0) | 37.3 (36.4 to 38.2) | 57.2 | 53.1 | 61.3 | < 0.001 | |
| p value** | < 0.001 | < 0.001 | |||||
| SF-12 | |||||||
| PCS | 1 year | 31.8 (8.8) | 37.9 (11.1) | 6.1 | 4.2 | 8.1 | < 0.001 |
| Change (95% CI) | 3.4 (1.8 to 5.0) | 10.3 (9.9 to 10.7) | 6.9 | 5.1 | 8.8 | < 0.001 | |
| p value** | < 0.001 | < 0.001 | |||||
| MCS | 1 year | 44.0 (14.7) | 49.5 (12.7) | 5.5 | 3.2 | 7.8 | < 0.001 |
| Change (95% CI) | − 2.2 (− 0.1 to − 4.4) | 2.4 (1.9 to 2.9) | 4.7 | 2.5 | 6.9 | < 0.001 | |
| p value** | 0.04 | < 0.001 | |||||
*t test
**Paired t test