Table 1.
Characteristics of the five patient groups
| Mild OA (n = 36) | Moderate OA (n = 62) | Severe OA (n = 47) | TKA (n = 63) | Revision of TKA (n = 54) | |
| Age in years | 36 (27–50) | 56 (27–72) | 65 (42–81) | 61(42–78) | 77 (36–89) |
| Gender, women % | 22 | 32 | 52 | 51 | 78 |
| VAS pain | 0.7 (0.0–6.7) | 3.9 (0.0–10.0) | 6.1 (1.0–10.0) | 1 (0.0–9.4) | 5.0 (0–10) |
| KOOS | |||||
| Pain | 85.3 ± 18.5 | 62.9 ± 25.7 | 41.8 ± 18.9 | 70.1 ± 24.5 | 61.6 ± 23.4 |
| Symptoms | 78.6 ± 7.1 | 63.2 ± 24.4 | 46.4 ± 18.7 | 72.3 ± 18.5 | 64.7 ± 21.5 |
| ADL | 91.2 ± 15.1 | 69.3 ± 24.2 | 43.4 ± 19.4 | 72.8 ± 23.3 | 56.6 ± 21.9 |
| Sport/recreation | 71.0 ± 23.4 | 36.2 ± 32.0 | 29.1 ± 39.2 | 33.2 ± 24.1 | 26.8 ± 34.1 |
| QoL | 67.0 ± 21.6 | 44.6 ± 26.3 | 30.9 ± 25.5 | 52.2 ± 23.8 | 36.6 ± 26.6 |
| SF-36 | |||||
| BP | 84.7 ± 19.7 | 63.6 ± 24.0 | 34.6 ± 22.1 | 70.7 ± 24.9 | 55.4 ± 27.2 |
| PF | 86.4 ± 17.2 | 61.1 ± 24.8 | 34.9 ± 20.6 | 61.7 ± 23.9 | 32.9 ± 24.4 |
| SF | 92.4 ± 10.5 | 82.8 ± 21.9 | 61.7 ± 28.1 | 81.8 ± 28.6 | 64.1 ± 29.0 |
| RF | 77.8 ± 38.2 | 64.8 ± 39.7 | 26.6 ± 34.7 | 57.4 ± 43.7 | 31.0 ± 38.8 |
| RE | 91.7 ± 25.7 | 87.4 ± 28.5 | 57.4 ± 44.3 | 69.7 ± 43.6 | 59.9 ± 42.6 |
| MH | 86.8 ± 13.4 | 79.6 ± 19.2 | 69.1 ± 20.0 | 74.6 ± 21.7 | 70.3 ± 20.7 |
| VT | 75.4 ± 13.4 | 68.9 ± 19.3 | 53.9 ± 19.3 | 66.5 ± 21.8 | 55.5 ± 19.1 |
| GH | 84.0 ± 12.8 | 65.0 ± 20.8 | 60.2 ± 23.0 | 66.8 ± 24.1 | 51.4 ± 21.3 |
Results are presented as median (range) or mean ± SD. Abbreviations: OA; osteoarthritis, TKA; total knee arthroplasty, Revision of TKA; Revision of total knee arthroplasty; VAS, Visual Analogue Scale; BP, bodily pain; PF, physical function; SF, social function; RF, role limitations because of physical problems; RE, role limitations because of emotional problems; MH, mental health; VT, vitality; GH, general health perception; ADL, Activities of daily living; QoL, Quality of life.