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Trajectory plots of swan-neck deformity scores, boutonnière deformity scores, ulnar drift scores and the Kapandji index over time. Trajectory plots of swan-neck deformity scores (a), boutonnière deformity scores (b), ulnar drift scores (c), and the Kapandji index (d). Differences between clusters are shown. Functional impairment did not worsen during the 11 years of the study
