Discordance between grades for lateral tibiofemoral joint space narrowing (JSN) using the Osteoarthritis Research Society (OARS) and line drawing atlases. All scores graded by the three observers at the first reading are shown
| Lateral tibiofemoral JSN: OARS atlas | Lateral tibiofemoral JSN: line drawing atlas | ||||
|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | Total | |
| 0 | 200 | 7 | 207 | ||
| 1 | 38 | 30 | 1 | 69 | |
| 2 | 2 | 15 | 17 | ||
| 3 | 7 | 7 | |||
| Total | 238 | 39 | 16 | 7 | 300 |