The number (%) of marginal osteophytes in the PFJ of the contralateral knee. Osteophytes at the superior and the inferior pole of the patella were graded 0–1 and at the other locations 0–3
| Grade | Medial patella | Lateral patella | Patella superior pole | Patella inferior pole | Medial femur | Lateral femur |
|---|---|---|---|---|---|---|
| 0 | 41 (72) | 35 (61) | 33 (63) | 44 (85) | 40 (71) | 51 (91) |
| 1 | 15 (26 | 22 (39) | 19 (37) | 8 (15) | 15 (27) | 5 (9) |
| 2 | 1 (2) | — | — | — | ||
| 3 | — | — | 1 (2) | — | ||
| Total | 57 | 57 | 52 | 52 | 56 | 56 |