Table 3 Preoperative and postoperative outcomes among four subgroups classified by LSR scores (mean ± standard deviation)
LSR | 5–10 | 11–15 | 16–20 | 21–25 | p value |
|---|---|---|---|---|---|
Number | 12 | 108 | 314 | 98 | – |
Satisfaction (%) | 50.0 | 82.4 | 84.7 | 84.7 | 0.016* |
Pre-op WOMAC | |||||
WOMAC pain | 11.1 ± 1.5 | 9.5 ± 2.0 | 8.5 ± 1.8 | 8.3 ± 1.9 | 0.001* |
WOMAC stiffness | 4.8 ± 0.6 | 4.7 ± 0.7 | 4.6 ± 0.7 | 4.6 ± 0.8 | 0.386 |
WOMAC function | 32.2 ± 3.9 | 32.3 ± 4.7 | 31.5 ± 6.0 | 31.8 ± 5.2 | 0.625 |
Pre-op SF-36 | |||||
SF-36 PCS | 27.3 ± 8.7 | 31.4 ± 11.2 | 31.9 ± 9.5 | 31.9 ± 9.9 | 0.450 |
SF-36 MCS | 51.8 ± 6.9 | 52.2 ± 8.2 | 52.4 ± 8.5 | 52.3 ± 9.1 | 0.993 |
Post-op WOMAC | |||||
WOMAC pain | 6.8 ± 1.6 | 5.3 ± 2.0 | 4.2 ± 1.8 | 3.9 ± 1.8 | 0.001* |
WOMAC stiffness | 1.8 ± 0.4 | 1.4 ± 0.6 | 1.2 ± 0.5 | 1.1 ± 0.7 | 0.001* |
WOMAC function | 19.1 ± 3.9 | 18.9 ± 4.9 | 17.6 ± 6.0 | 18.1 ± 5.1 | 0.213 |
Post-op SF-36 | |||||
SF-36 PCS | 41.3 ± 9.5 | 46.5 ± 11.3 | 46.7 ± 9.5 | 47.1 ± 9.8 | 0.288 |
SF-36 MCS | 49.4 ± 7.4 | 55.9 ± 8.3 | 54.4 ± 8.5 | 53.5 ± 9.5 | 0.046* |
Post-op ROM | 115.9 ± 18.4 | 121.3 ± 13.4 | 119.3 ± 13.8 | 118.1 ± 12.8 | 0.287 |
Change in WOMAC | |||||
WOMAC pain | 4.3 ± 0.9 | 4.2 ± 0.8 | 4.3 ± 0.9 | 4.4 ± 0.9 | 0.553 |
WOMAC stiffness | 3.0 ± 0.7 | 3.2 ± 0.9 | 3.4 ± 0.9 | 3.5 ± 1.0 | 0.097 |
WOMAC function | 13.1 ± 1.4 | 13.4 ± 2.7 | 13.9 ± 3.2 | 13.6 ± 4.0 | 0.546 |
Change in SF-36 | |||||
SF-36 PCS | 14.0 ± 2.4 | 15.1 ± 2.0 | 14.8 ± 2.9 | 15.2 ± 3.0 | 0.340 |
SF-36 MCS | 2.4 ± 0.7 | 3.6 ± 0.7 | 2.0 ± 0.9 | 1.2 ± 0.9 | 0.001* |
Satisfaction scores | 68 ± 6.4 | 76 ± 8.9 | 81 ± 8.6 | 82 ± 6.1 | 0.001* |