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.