Perceptual variation in categorizing individuals according to American College of Rheumatology classification criteria for hand, knee, and hip osteoarthritis (OA): observations based on an Australian Twin Registry study of OA.

Abstract

Since clinical agreement was extremely high in all 3 anatomic sites, and for both pairs of assessors, we conclude that for genetic epidemiology purposes, subjects can be examined by a single experienced rheumatologist using the ACR classification criteria.