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Rheumatology 2000; 39: 55-62
© 2000 British Society for Rheumatology

Comparison of sonography and magnetic resonance imaging for the diagnosis of partial tears of finger extensor tendons in rheumatoid arthritis

W. A. A. Swen, J. W. G. Jacobs1, P. C. G. Hubach2, J. H. Klasens3, P. R. Algra4 and J. W. J. Bijlsma1

Department of Rheumatology, Hospital: Medisch Centrum Alkmaar,
1 Department of Rheumatology and Clinical Immunology, University Medical Centre Utrecht,
2 Department of Orthopaedic Surgery,
3 Department of Plastic and Reconstructive Surgery and
4 Department of Radiology, Hospital: Medisch Centrum Alkmaar, The Netherlands

Correspondence to: W. A. A. Swen, Department of Rheumatology, Hospital: Medisch Centrum Alkmaar, Wilhelminalaan 12, 1815 JD Alkmaar, The Netherlands.

Objective. Finger extensor tenosynovitis in rheumatoid arthritis (RA) may lead to partial and eventually to complete tendon tears. The aim of this study was to investigate the diagnostic value of sonography (SG) and/or magnetic resonance imaging (MRI) to visualize partial tendon tears.

Methods. Twenty-one RA patients with finger extensor tenosynovitis for more than 12 months underwent SG, MRI and surgical inspection, the latter being the gold standard.

Results. For partial tears, sensitivity and specificity were 0.27 and 0.83 for MRI, and 0.33 and 0.89 for SG, respectively. Positive and negative predictive values were 0.35 and 0.78 for MRI, and 0.50 and 0.80 for SG, respectively. Accuracy was 0.69 for MRI and 0.75 for SG.

Conclusion. For visualization of partial finger extensor tendon tears in RA patients, SG performs slightly better than MRI, but both techniques are at present not sensitive enough to be used in daily practice.

KEY WORDS: Sonography, MRI, Partial tears, Finger extensor tendon, Rheumatoid arthritis, Diagnosis, Imaging


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