© 1991 British Society for Rheumatology
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CLINICAL ASSESSMENT OF ANKYLOSING SPONDYLITIS: A STUDY OF OBSERVER VARIATION IN SPINAL MEASUREMENTS

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*Wellington Regional Rheumatic Diseases Unit, Hutt Hospital Wellingon, New Zealand
Department of Community Health, Wellington School of Medicine University of Otago Wellington, New Zealand
Department of Physiotherapy, Wellington Hospital Wellington, New Zealand
Correspondence to:
Correspondence to Dr M. R. Laurent, Department of Rheumatology, Royal North Shore Hospital, St Leonards 2065, Sydney, Australia
Twenty-two measurements repeated non-sequentially on each of 10 patients by five observers were undertaken to determine their reliability for routine clinical use. Measurements without significant inter-observer variation or with a coefficient of reliability greater than 0.70 were cervical rotation, cervical lateral flexion, tragus to wall distance, fingertip to floor distance on sagittal and lateral flexion, C7 to iliac crest line distraction and modified Schober index. It is concluded that many of the currently used measurements are either statistically unreliable or clinically unhelpful in mild or moderate ankylosing spondylitis. The most clinically useful were cervical rotation using a protractor, cervical lateral flexion using a goniometer, thoracolumbar flexion as the C7 to iliac crest line distraction, thoracolumbar lateral flexion as the fingertip to floor distance and the modified Schober index.
KEY WORDS: Reliability, Inter-observer, Intra-observer, Ankylosing spondylitis, Assessment
Present address: Department of Rheumatology, Royal North Shore Hospital, Sydney, Australia.
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