Table 1.
Frequencies of Posterior Horn Meniscal Damage and Posterior Synovitis According to Radiographic OA Severity
| Radiographic OA Status (K/L Grade) | K/L 0 N (%)a |
K/L 1 | K/L 2 | K/L 3 | K/L 4 | All Grades N (%)b |
|---|---|---|---|---|---|---|
| Posterior horn meniscal damagec | ||||||
| 0 | 184 (74.5) | 34 (13.8) | 20 (8.1) | 6 (2.4) | 3 (1.2) | 247 (65.5) |
| 1 | 10 (52.6) | 4 (21.1) | 3 (15.8) | 2 (10.5) | 0 (0.0) | 19 (5.0) |
| 2 | 27 (42.2) | 16 (25.0) | 12 (18.8) | 9 (14.1) | 0 (0.0) | 64 (17.0) |
| 3 and 4 | 12 (26.1) | 7 (15.2) | 6 (13.0) | 17 (37.0) | 4 (8.7) | 46 (12.2) |
| Synovitis around posterior hornd | ||||||
| 0: <2 mm | 165 (7.1) | 40 (16.3) | 23 (9.4) | 15 (6.1) | 3 (1.2) | 246 (65.3) |
| 1: 2–4 mm | 48 (60.0) | 11 (13.8) | 11 (13.8) | 10 (12.5) | 0 (0.0) | 80 (21.2) |
| 2: >4 mm | 20 (40.0) | 10 (20.0) | 7 (14.0) | 9 (18.0) | 4 (8.0) | 50 (13.3) |
| Synovitis posterior to the PCL | ||||||
| 0: <2 mm | 137 (72.1) | 33 (17.4) | 11 (5.8) | 9 (4.7) | 0 (0.0) | 190 (50.4) |
| 1: 2–4 mm | 42 (52.5) | 12 (15.0) | 17 (21.3) | 7 (8.8) | 2 (2.5) | 80 (21.2) |
| 2: >4 mm | 54 (50.9) | 16 (15.1) | 13 (12.3) | 18 (17.0) | 5 (4.7) | 106 (28.1) |
a
% in regard to meniscal/synovitis grade in rows.
b
In regard to all knees: n = 377.
c
Medial only, lateral only, or both, medial and lateral.
d
Either medial or lateral or both.