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Rheumatology (Oxford). 2004 Jan;43(1):85-8. Epub 2003 Sep 16.

Clinical assessment of sacroiliitis and HLA-B27 are poor predictors of sacroiliitis diagnosed by magnetic resonance imaging in psoriatic arthritis.

Author information

1
Nuffield Orthopaedic Centre, Headington, Oxford OX3 7LD, UK. lyn.williamson@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.

PMID:
13130147
DOI:
10.1093/rheumatology/keg475
[Indexed for MEDLINE]

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