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With great interest we read the recently published letter by Rubbert-Roth et al.1 In a post-hoc analysis of the U-Act-Early trial in 317 patients with very early rheumatoid arthritis (RA),2 it was observed that patients with large joint involvement (LJI) at baseline had significantly more disease activity and more functional disability at baseline. In addition, while the disease activity score (DAS) was similar after 2 years of follow-up compared with patients without LJI, the difference in functional disability remained. Furthermore, patients without LJI had a higher chance of achieving drug-free remission. The authors concluded that equal weighting of joints in the DAS is contrasting an unequal impact on physical function.1
The idea of a weighted joint score is not new. A joint index that takes the joint surface into account, thus weighing large joints heavier than small joints, is the Lansbury index.3 It has been reported that this index correlates better with C reactive protein (CRP) than joint …
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