Table 2.
Mean (standard deviation) health outcome scores of patients before and after surgery*
| Pre-surgery | Six-months follow-up | Two-years follow-up | |
|---|---|---|---|
| SF-36 | |||
| Physical functioning | 32.7(20.2) | 55.4(23.4) | 59.8(23.6) |
| Role physical | 38.8(40.7) | 71.9(41.5) | 68.9(42.7) |
| Bodily pain | 41.7(14.3) | 47.6(18.0) | 40.9(14.0) |
| General health | 56.1(8.9) | 56.2(9.0) | 52.2(8.3) |
| Role emotional | 81.2(38.6) | 96.8(16.2) | 93.3(23.8) |
| Social functioning | 52.8(14.0) | 54.3(15.6) | 51.0(9.7) |
| Vitality | 56.4(12.8) | 56.2(13.4) | 55.9(11.2) |
| Mental health | 64.7(10.2) | 65.9(11.4) | 65.5(8.7) |
| Oxford Knee Score | 49.1(16.9) | 77.7(15.4) | 83.1(13.5) |
| Knee Society Clinical Rating Scale | |||
| Knee score | 47.5(16.0) | 85.0(12.3) | 89.1(5.9) |
| Functioning score | 46.2(20.1) | 62.4(22.0) | 67.3(21.6) |
*The GEE does not provide a global p-value to test whether the means were the same across all three time periods, however the p-values comparing 6 months and 12 months vs. pre-op were both < 0.0001.