A comparison of findings (number of hips) using quantitative measurement of minimum joint space and the Kellgren and Lawrence qualitative global assessment. The horizontal and vertical lines denote the cut off point for definition of hip OA in the two assessment systems
| Minimum joint space (mm) | Kellgren and Lawrence grade | |||||
|---|---|---|---|---|---|---|
| 0 | I | II | III | IV | Total number of hips | |
| 0 | 0 | 0 | 8 | 30 | 17 | 55 |
| 0.5 | 0 | 0 | 0 | 3 | 0 | 3 |
| 1 | 0 | 0 | 11 | 16 | 1 | 28 |
| 1.5 | 0 | 1 | 11 | 2 | 0 | 14 |
| 2 | 1 | 8 | 31 | 12 | 0 | 52 |
| 2.5 | 7 | 29 | 21 | 3 | 0 | 60 |
| 3 | 323 | 127 | 16 | 2 | 0 | 468 |
| 3.5 | 252 | 22 | 2 | 0 | 0 | 276 |
| 4 | 1275 | 91 | 12 | 1 | 0 | 1379 |
| 4.5 | 134 | 10 | 0 | 0 | 0 | 144 |
| 5 | 486 | 9 | 2 | 0 | 0 | 497 |
| 5.5 | 3 | 0 | 0 | 0 | 0 | 3 |
| 6 | 17 | 1 | 1 | 0 | 0 | 19 |
| 7 | 4 | 0 | 0 | 0 | 0 | 4 |
| Total number of hips | 2502 | 298 | 115 | 69 | 18 | 3002 |