Discrepant cases and the diagnoses given in each report (n = 9)
| Fluid diagnosis | Biopsy diagnosis |
|---|---|
| Haemorrhage | Reactive arthritis |
| Osteoarthritis | Primary inflammatory arthritis |
| Non-inflammatory | Inflammatory arthritis |
| Non-inflammatory | Inflammatory arthritis |
| Non-inflammatory | Primary inflammatory arthritis |
| Non-inflammatory | Primary inflammatory/juvenile chronic arthritis |
| Haemarthrosis and seronegative arthritis | Osteoarthritis |
| Non-inflammatory | Primary inflammatory arthritis |
| Non-inflammatory | Primary inflammatory arthritis |