Table 1 Hand osteoarthritis classification criteria
American College of Rheumatology criteria | Criteria for symptomatic hand OA using NHANES III data adapted from Dillon and colleagues a |
|---|---|
Hand OA is identified if participants meet criteria 1 to 4: | Hand OA is identified if participants meet criteria 1 to 4: |
   1. Hand pain, aching, or stiffness |    1. Ever had history of hand pain, aching, stiffness lasting more than 6 weeks |
   2. Hard tissue enlargement of two or more of 10 selected joints |    2. At least two sites of hard tissue enlargement, with the combination of first CMC and one other site with Heberden's or Bouchard's nodes |
   3. Fewer than three swollen metacarpal-phalangeal joints |    3. Fewer than three swollen metacarpal-phalangeal joints or participants do not meet the criteria for rheumatoid arthritis |
   4a. Either hard tissue enlargement of two or more DIP joints, or |    4. The presence of bilateral Heberden's nodes at any site |
   4b. deformity of one out of 10 joints |    (would remove this number "5" as this is not one of the criteria used in Dillon's NHANES study. The text was put here to compare with ACR criteria. No such data available from NHANES III |