Table 2 Ahlbäck grade in the series
Ahlbäck grading | N | % |
|---|---|---|
I Narrowing of the joint space (with or without subchondral sclerosis) (*) | 243 | 18.3 |
II Obliteration of the joint space | 358 | 26.9 |
III Bone defect/loss <5 mm | 416 | 31.3 |
IV Bone defect/loss between 5 and 10 mm | 241 | 18.1 |
V Bone defect/loss >10 mm, often with subluxation and arthritis of the other compartment | 71 | 5.3 |
Total | 1329 | 100.0 |