Table 1.
Characteristics of the study subjects.
| Study group | n (% women) | Age, mean years (SD, range) | Time after injury, range in weeks (years) |
|---|---|---|---|
| All subjects | 122 (31) | 40 (18, 14–86) | – |
| Reference | 10 (10) | 60 (11, 45–77) | – |
| Acute inflammatory arthritisa | 13 (46) | 63 (15, 29–81) | – |
| Injuryb | 79 (28) | 31 (12, 14–69) | 0–549 (0–10.5 years) |
| Osteoarthritis | 20 (45) | 51 (16, 24–86) | – |
a12 had pyrophosphate arthritis, and 1 Yersinia-triggered reactive arthritis.b12 had isolated anterior cruciate ligament (ACL) injury, 46 ACL injury with concomitant meniscus injury, and 21 had isolated meniscus injury.