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. 2007 Dec;66(12):1669-71.
doi: 10.1136/ard.2007.072561. Epub 2007 Jul 6.

A modification of the Omeract RA MRI score for erosions for use with an extremity MRI system with reduced field of view

Jane E Freeston  1 , Ewa Olech, David Yocum, Elizabeth M A Hensor, Paul Emery, Philip G Conaghan
Affiliations

A modification of the Omeract RA MRI score for erosions for use with an extremity MRI system with reduced field of view

Jane E Freeston et al. Ann Rheum Dis. 2007 Dec.

Abstract

Objectives: To develop and test the reliability of a modified version of the OMERACT rheumatoid arthritis magnetic resonance imaging score (RAMRIS) for erosions using extremity MRI (eMRI) with reduced field of view (RAMRIS-RV).

Methods: Using a MagneVu 0.2 T machine, the preliminary RAMRIS-RV assessed erosions in metacarpophalangeal (MCP) joints 2-3, bases of metacarpal (MC) 2-5, and all wrist bones excluding base MC 1, pisiform and trapezium. T1 weighted images of >/=500 MCP and wrist bony sites from a mixed severity RA and control cohort were evaluated. An inter-reader reliability study evaluating 300 wrist and 160 MCP bony sites was then performed.

Results: Mean per cent exact (and close) agreement results were as follows: MCP proximal sites 83.5 (96.2), MCP distal 54.4 (77.2), bases MC 2-4 85.2 (96.7), carpal bones 79.0 (92.1), distal radius/ulna 66.4 (87.8). The base of MCP 5 was visualised in </=50% cases (13/25) and was removed from the final RAMRIS-RV.

Conclusions: The RAMRIS-RV is a practical tool that can be used with eMRI with a reduced field of view. This study shows excellent inter-reader reliability for erosion assessment, albeit in a reduced number of bony sites.

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Conflict of interest statement

Competing interests: None declared.

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