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Ann Rheum Dis 72:530-534 doi:10.1136/annrheumdis-2011-201114
  • Clinical and epidemiological research
  • Extended report

Detection, scoring and volume assessment of bone erosions by ultrasonography in rheumatoid arthritis: comparison with CT

  1. Mikkel Østergaard2
  1. 1Department of Rheumatology, Copenhagen University Hospital at Slagelse, Slagelse, Denmark
  2. 2Department of Rheumatology, Copenhagen University Hospital at Glostrup, Glostrup, Denmark
  3. 3Department of Rheumatology, Copenhagen University Hospital at Koege, Koege, Denmark
  4. 4Department of Rheumatology, Copenhagen University Hospital at Gentofte, Gentofte, Denmark
  5. 5Department of Diagnostic Radiology, Copenhagen University Hospital at Herlev, Herlev, Denmark
  1. Correspondence to Dr Uffe Møller Døhn, Department of Rheumatology, Copenhagen University Hospital at Slagelse, Slagelse DK-2600, Denmark; umd{at}dadlnet.dk
  1. Contributors UMD was involved in the planning of the study, recruitment of patients, performed all ultrasound examinations, carried out data collection, performed statistical analysis and was the main contributor in the manuscript preparation. LT and MS were involved in data collection and analysis and contributed substantially in the manuscript preparation. MSH, MLH, AH and ORM were involved in the planning of the study, recruitment of patients, clinical examination of patients, data collection and contributed in the manuscript preparation. MH and JM were involved in the imaging protocol and preparation of CT images. MØ is the principal investigator and mainly responsible for the study protocol, assessed all CT images, participated substantially in data collection, statistical analysis and preparation of the manuscript. All authors have read and approved the final manuscript.

  • Accepted 9 April 2012
  • Published Online First 15 May 2012

Abstract

Objectives To determine the accuracy of ultrasonography (US) for bone erosion detection in different areas of rheumatoid arthritis (RA) metacarpophalangeal (MCP) joints with multislice CT as the reference method. Second, to establish the necessary bone volume loss on CT for US to reliably detect it as an erosion, and finally to compare two semiquantitative US-erosion scoring methods.

Methods The 2nd–5th MCP joints of 49 patients with RA were examined by CT and US, and evaluated for the presence of bone erosion in each MCP joint quadrant. On CT, erosion volume was scored according to the OMERACT-RAMRIS score (bone volume loss in 10% increments of original bone volume). US erosions were scored 0–3 according to the Szkudlarek and Scoring by UltraSound Structural erosion (ScUSSe) systems, respectively.

Results Seven hundred and eighty-four MCP joint quadrants were examined. Erosions were detected by CT in 259 quadrants and by US in 142 quadrants. Sensitivity/specificity/accuracy of US was overall 44%/95%/78% compared with 71%/95%/90% in areas with good US accessibility (radial 2nd MCP, ulnar 5th MCP and all dorsal/palmar aspects). US detected 95% of erosions with bone volume loss >20%. In US accessible areas, 63% of erosions with 1–10% bone volume loss and 94% of erosions with >10% bone loss were detected. The two US scoring systems agreed well on large erosions, whereas the smallest erosions (Szkudlarek grade 1, of which 86% were confirmed by CT) were not scored by ScUSSe.

Conclusion In accessible areas, US was highly accurate for detection and semiquantitative assessment of RA bone erosion. Even the smallest erosions, only detected in one plane, were generally confirmed by CT.

Footnotes

  • Funding ABBOTT Denmark; The Danish Rheumatism Association; Aase and Ejnar Danielsens Foundation.

  • Competing interests None.

  • Provenance and peer review Not commissioned; externally peer reviewed.