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Rheumatology 1999; 38: 1127-1129
© 1999 British Society for Rheumatology

Larsen scoring of digitized X-ray images

C. Solymossy, J. Dixey, M. Utley1, S. Gallivan1, A. Young2, N. Cox3, P. Davies4, P. Emery5, A. Gough6, D. James7, P. Prouse8, P. Williams9 and J. Winfield10

Robert Jones and Agnes Hunt Orthopaedic Hospital, Oswestry,
1 Clinical Operational Research Unit, University College London,
2 St Albans City Hospital, St Albans,
3 Royal Hampshire County Hospital, Winchester,
4 Broomfield Hospital, Chelmsford,
5 Rheumatology Research Unit, University of Leeds, Leeds,
6 Harrogate Hospital, Harrogate,
7 Grimsby Hospital, Grimsby,
8 Basingstoke District Hospital, Basingstoke,
Medway Hospital, Gillingham and
10 Royal Hallamshire Hospital, Sheffield, UK

Correspondence to: J. J. Dixey, Robert Jones and Agnes Hunt Orthopaedic and District Hospital NHS Trust, Oswestry, Shropshire SY10 7AG, UK.

Objective.To determine how Larsen scores from digitized X-rays compare to those from film originals.

Methods.A hundred sets of radiographs of patients recruited with early rheumatoid arthritis (RA) were assessed using the Larsen scoring system. Digitized copies of these sets were then viewed on a computer screen and scored according to Larsen in a random order. The quality of the digitized image was also recorded. For each set of X-rays, the signed difference between the score from film and the score from the digitized images was calculated.

Results.A total of 95% of the digitized X-ray sets were scored successfully; 5% were not scored due to the images being unreadable. The mean difference between the two sets of scores was -1.2 (95% CI [-2.06, -0.37]). There was no trend in the difference with respect to the mean of the two scores (P>0.1).

Conclusion.The Larsen scoring of digitized X-ray images has been validated.

KEY WORDS: Early RA, Erosive disease, Digitized images, Assessment of X-rays


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