Table 2.
Surgical history
| Japan | US | EUR | p-value | |
|---|---|---|---|---|
| History | n = 302 | n = 527 | n = 1487 | |
| Previous surgery, n (%) | 30 (10%) | 113 (21%) | 250 (17%) | < 0.001a |
| Willing to have surgery | n = 217 | n = 274 | n = 704 | 0.013a |
| Total | 36 (17%) | 88 (32%) | 279 (38%) | 0.013 a |
| Male | 9 (25%) | 47 (53%) | 114 (42%) | |
| Female | 27 (75%) | 41 (47%) | 156 (58%) | |
| Procedure | n = 20 | n = 76 | n = 164 | |
| Total knee replacement, n (%) | 17 (85%) | 35 (46%) | 76 (48%) | 0.005a |
| Arthroscopic washout/debridement, n (%) | 0 (0%) | 29 (38%) | 45 (28%) | 0.004a |
| Synovectomy procedure, n (%) | 1 (5%) | 2 (3%) | 8 (5%) | 0.612b |
| Osteotomy, n (%) | 0 (0%) | 2 (3%) | 8 (5%) | 0.584b |
| Joint revision, n (%) | 1 (5%) | 0 (0%) | 7 (4%) | 0.102b |
| Conversion to joint replacement, n (%) | 0 (0%) | 2 (3%) | 4 (3%) | 1.000b |
| Arthrodesis, n (%) | 0 (0%) | 2 (3%) | 3 (2%) | 0.776b |
aChi-squared test
bFisher’s exact test