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Response to ‘In erosive hand osteoarthritis more inflammatory signs on ultrasound are found than in the rest of hand osteoarthritis’ by Kortekaas et al
  1. Ai Lyn Tan1,2,
  2. Andrew Grainger1,2,
  3. Dennis McGonagle1,2
  1. 1NIHR Leeds Musculoskeletal Biomedical Research Unit, Chapel Allerton Hospital, Leeds, UK
  2. 2Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, UK
  1. Correspondence to Dr Ai Lyn Tan, Institute of Rheumatic and Musculoskeletal Medicine, Chapel Allerton Hospital, Leeds, LS7 4SA, UK; a.l.tan{at}leeds.ac.uk

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We read with interest the article ‘In erosive hand osteoarthritis more inflammatory signs on ultrasound are found than in the rest of hand osteoarthritis’ by Kortekaas et al.1 The authors found that interphalangeal joints of erosive osteoarthritis (EOA) patients, with erosions being defined by conventional radiography (CR), demonstrated more sonographic inflammatory changes in adjacent non-CR-eroded joints compared with patients without EOA. This may give the impression that a joint showing erosions on hand CR points towards a more severe generalised inflammatory phenotype and we would like to clarify this.

We are unsure what the significance and robustness of these observations are, given the increasing pathophysiological understanding of hand osteoarthritis that has …

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