[1986] Criteria for
Classification of Idiopathic Osteoarthritis (OA) of the Knee*.
| Clinical
and laboratory |
Clinical
and radiographic |
Clinical† |
| Knee pain |
Knee pain |
Knee pain |
| + at least 5 of
9: |
+ at least 1 of
3: |
+ at least 3 of
6: |
- Age > 50 years
|
- Age > 50 years
|
- Age > 50 years
|
- Stiffness
< 30 minutes |
- Stiffness < 30
minutes |
- Stiffness < 30
minutes |
- Crepitus |
- Crepitus |
- Crepitus |
- Bony Tenderness |
+ Osteophytes
|
- Bony Tenderness |
- Bony enlargement |
|
- Bony enlargement |
- No palpable warmth |
|
- No palpable warmth |
- ESR <40 mm/hour |
|
|
- RF <1:40 |
|
|
- SF OA |
|
|
| |
|
|
| 92%
sensitive |
91%
sensitive |
95%
sensitive |
| 75%
specific |
86%
specific |
69%
specific |
*
ESR = erythrocyte sedimentation rate (Westergren); RF = rheumatoid factor; SF
OA = synovial fluid signs of OA (clear, viscous, or white blood cell count <2,000/mm3).
†
Alternative for the clinical category would be 4 of 6, which is 84% sensitive
and 89% specific.
R. Altman, E. Asch,
D. Bloch, G. Bole, D. Borenstein, K. Brandt, et al. The American College of
Rheumatology criteria for the classification and reporting of osteoarthritis
of the knee. Arthritis Rheum 1986;29:1039--1049.
