Rheumatology Advance Access originally published online on September 16, 2003
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Rheumatology 2004; 43: 85-88
© British Society for Rheumatology 2003; all rights reserved
Clinical |
Clinical assessment of sacroiliitis and HLA-B27 are poor predictors of sacroiliitis diagnosed by magnetic resonance imaging in psoriatic arthritis
Nuffield Orthopaedic Centre, Headington, Oxford OX3 7LD, UK.
Correspondence to: L. Williamson, Consultant Rheumatologist, The Great Western Hospital, Swindon, UK. E-mail: lyn.williamson{at}smnhst.swest.nhs.uk
Abstract
Objective. To determine the frequency and clinical predictors of sacroiliitis diagnosed by magnetic resonance imaging (MRI) in a psoriatic arthritis (PsA) population.
Methods. The studied comprised 103 patients with PsA. A careful clinical assessment for sacroiliitis was made from history and examination, and HLA-B27 testing was performed. Sixty-eight patients underwent tilted coronal fat-saturated T1-weighted and STIR MRI of the sacroiliac joints.
Results. Clinical features of moderate or severe sacroiliitis were found in 24/68 (35%) patients. MRI features of sacroiliitis were found in 26/68 (38%) patients. Clinical features of sacroiliitis were present in 14/42 (33%) with normal MRI scans and 10/26 (38%) with abnormal scans (normal vs abnormal scans, P = 0.7). The presence of sacroiliitis on MRI was associated with restricted spinal movements (P = 0.004) and the duration of PsA (P = 0.04). There was no correlation between HLA-B27 and sacroiliitis diagnosed by MRI.
Conclusion. Sacroiliitis diagnosed by MRI occurs commonly in PsA but is difficult to detect clinically.
KEY WORDS: Sacroiliitis, HLA-B27, MRI, Psoriatic arthritis, Clinical assessment.
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