Baseline pain, function, and health status for hip and knee patients by surgical outcome for total joint replacement
| Outcome score, mean (SD) | |||||
|---|---|---|---|---|---|
| Scale | Total sample (n = 257) | TJR (n = 107) | No TJR (n = 110) | Loss to follow-up (n = 40) | P-value for TJR vs no TJR |
| VAS pain (0 = no pain to 10 = worse pain) | |||||
| Hip patients | 6.5(2.0) | 7.0(1.6) | 5.5(2.4) | 6.8(1.9) | 0.001 |
| Knee patients | 6.4(2.2) | 7.1 (1.8) | 5.8(2.3) | 6.8(2.0) | 0.003 |
| WOMAC pain (0 = no pain to 20 = extreme pain) | |||||
| Hip patients | 10.9 (3.6) | 11.5 (3.6) | 9.9 (3.6) | 10.9 (3.5) | 0.025 |
| Knee patients | 10.7(3.4) | 11.7(2.9) | 10.1 (3.8) | 10.8(2.5) | 0.034 |
| WOMAC physical function (0 = no difficulty to 68 = extreme difficulty) | |||||
| Hip patients | 38.4(12.0) | 41.8(10.7) | 34.1 (11.7) | 36.5(13.5) | 0.001 |
| Knee patients | 35.9 (12.1) | 39.1 (11.2) | 34.0 (13.1) | 35.8(9.4) | 0.044 |
| WOMAC stiffness (0 = no stiffness to 8 = extreme stiffness) | |||||
| Hip patients | 4.8(1.6) | 5.3 (1.3) | 4.2(1.5) | 4.6 (1.9) | <0.001 |
| Knee patients | 4.8(1.7) | 5.2(1.5) | 4.6(1.8) | 4.6(1.4) | 0.05 |
| Oxford (12 = least difficulties to 60 = most difficulties) | |||||
| Oxford Hip Score | 39.7(8.6) | 42.3(7.7) | 36.4(8.4) | 38.3(9.6) | <0.001 |
| Oxford Knee Score | 39.1 (8.7) | 41.7 (8.3) | 37.4(9.2) | 39.8(6.4) | 0.018 |
| SF-36 paina | |||||
| Hip patients | 30.7 (19.5) | 25.9 (18.3) | 37.9 (19.4) | 30.9 (19.8) | 0.001 |
| Knee patients | 35.0(20.4) | 31.7(19.9) | 37.0(20.7) | 35.3(20.5) | 0.157 |
| SF-36 physical function | |||||
| Hip patients | 27.3(20.9) | 22.7(17.8) | 36.0(23.5) | 24.2(19.6) | 0.005 |
| Knee patients | 27.3 (19.9) | 20.4(17.5) | 32.6 (21.1) | 22.8(14.5) | 0.002 |
| SF-36 role limitation (physical) | |||||
| Hip patients | 23.3 (10.2) | 21.3 (9.6) | 27.4(10.0) | 21.5 (10.5) | 0.002 |
| Knee patients | 23.9(10.4) | 21.0(9.6) | 26.1 (10.8) | 22.5(8.7) | 0.016 |
| SF-36 role limitation (mental) | |||||
| Hip patients | 33.7(13.4) | 31.4(14.0) | 36.3(11.9) | 33.6 (13.4) | 0.029 |
| Knee patients | 33.8(14.2) | 32.0 (13.6) | 35.8(15.2) | 30.4(9.9) | 0.141 |
| SF-36 mental health | |||||
| Hip patients | 60.1 (16.3) | 59.6 (16.0) | 61.9 (13.4) | 58.3 (21.2) | 0.521 |
| Knee patients | 60.2(17.9) | 59.3(17.3) | 62.0(18.6) | 55.3(16.3) | 0.317 |
| SF-36 social function | |||||
| Hip patients | 53.2(29.6) | 51.7(29.4) | 60.3(26.5) | 44.0 (32.2) | 0.079 |
| Knee patients | 56.6 (28.3) | 54.2 (28.6) | 59.1 (28.9) | 52.9 (25.6) | 0.359 |
| SF-36 energy and vitality | |||||
| Hip patients | 40.8(18.1) | 39.5 (18.7) | 44.4(16.4) | 37.6 (18.6) | 0.147 |
| Knee patients | 39.7 (17.9) | 40.7(18.1) | 38.8(17.8) | 40.8(18.7) | 0.671 |
| SF-36 health perceptions | |||||
| Hip patients | 58.3(22.9) | 60.6(22.7) | 59.3(22.7) | 49.5(22.7) | 0.885 |
| Knee patients | 51.3 (23.2) | 50.4(23.2) | 52.5 (21.9) | 48.5 (28.7) | 0.725 |
| SF-36 change in health | |||||
| Hip patients | 33.5 (21.4) | 32.0 (22.8) | 34.6 (17.7) | 37.5 (22.8) | 0.459 |
| Knee patients | 35.0 (19.7) | 34.4 (22.4) | 35.2 (18.6) | 35.3 (17.8) | 0.721 |
↵a All SF-36 scores: lower scores indicate worse outcomes. SF-36 = Short Form-36. TJR = total joint replacement. VAS = visual analogue scale. WOMAC = Western Ontario and McMaster Universities Osteoarthritis Index