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The following article was originally published with an incorrect digital object identifier (doi): Song IH, Althoff CE, Hermann KG, Scheel AK, Knetsch T, Schoenharting M, et al. Knee osteoarthritis. Efficacy of a new method of contrast-enhanced musculoskeletal ultrasonography in detection of synovitis in patients with knee osteoarthritis in comparison with magnetic resonance imaging. Ann Rheum Dis 2008;67:19-25. It has been updated with the correct doi: 10.1136/ard.2007.067462. We apologise for any inconvenience caused.