Table II.
Changes in validated measures from pre-operative assessment to six and 12 months post-operatively using linear mixed model (n = 206)
| Mean (sd) score | Change over time | p-values (Sidak-corrected) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Outcome measure | Pre-operative (n = 206) | 6 months (n = 188) | 12 months (n = 181) | F | df | p-value | Pre vs 6 mths | Pre vs 12 mths | 6 vs 12 mths | ||
| WOMAC* | |||||||||||
| Pain | 11.4 (3.7) | 3.1 (3.8) | 2.7 (3.7) | 375.62 | 2, 660.66 | < 0.001 | < 0.001 | < 0.001 | 0.280 | ||
| Stiffness | 4.9 (1.6) | 2.2 (1.6) | 2.0 (1.7) | 281.77 | 2, 383.37 | < 0.001 | < 0.001 | < 0.001 | 0.224 | ||
| Physical function | 40.5 (12.7) | 15.7 (13.6) | 15.3 (14.0) | 370.65 | 2, 370.65 | < 0.001 | < 0.001 | < 0.001 | 0.751 | ||
| OHS† | 18.5 (8.1) | 36.8 (9.6) | 37.9 (9.5) | 631.28 | 2, 374.50 | < 0.001 | < 0.001 | < 0.001 | 0.089 | ||
| SF-36‡ | |||||||||||
| Total Physical Score | 28.2 (8.5) | 40.1 (11.1) | 40.9 (11.6) | 233.15 | 2, 375.70 | < 0.001 | < 0.001 | < 0.001 | 0.471 | ||
| Total Mental Score | 47.2 (14.0) | 50.7 (12.1) | 50.4 (13.3) | 9.70 | 2, 369.77 | < 0.001 | < 0.001 | 0.002 | 0.933 | ||
| HADS§ | |||||||||||
| Anxiety score | 7.6 (4.6) | 4.8 (4.3) | 4.9 (4.5) | 81.19 | 2, 372.72 | < 0.001 | < 0.001 | < 0.001 | 0.698 | ||
| Depression score | 7.4 (3.9) | 4.1 (3.8) | 3.8 (3.8) | 132.16 | 2, 369.14 | < 0.001 | < 0.001 | < 0.001 | 0.846 | ||
* WOMAC, Western Ontario and McMaster Universities osteoarthritis index: pain (0 to 20), stiffness (0 to 8) and physical function (0 to 68) subscores, with lower scores indicating better function † OHS, Oxford hip score (0 to 48, higher score indicating better outcome following THR) ‡ SF-36, Short-Form 36: Total Physical and Total Mental Scores (both from 0 to 100), with higher scores indicating better quality of life and norm-based scoring with a mean of 50 (sd 10) § HADS, Hospital Anxiety and Depression Scale: anxiety (0 to 21) and depression (0 to 21), each graded as normal (0 to 7), mild (8 to 10), moderate (11 to 15) and severe (16 to 21)