| Staff | Percentage (%) |
Bone erosions | 43 | 81.1 |
Bone demineralization | 28 | 52.8 |
Joint pinching | 20 | 37.7 |
Joint deformation | 16 | 30.2 |
Swelling of the soft parts | 3 | 5.7 |
Geodes | 2 | 3.8 |