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Response to: ‘Synovitis in knee osteoarthritis: a precursor or concomitant feature?’ by Zeng et al
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We thank Zeng et al1 for their interest in our paper ‘Synovitis in knee osteoarthritis: a precursor of disease?’.2 We would like to clarify the reason we chose radiographs over MRI to identify early radiographic knee osteoarthritis (OA). We agree with the author's statement that MRI is more sensitive than knee radiographs for identification of early knee OA.3 However, at the moment the MRI definition of knee OA has not been …