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Lookup NU author(s): Dr Ajay Abraham,
Dr Iain Goff,
Professor Mark Pearce,
Emeritus Professor Roger Francis,
Dr Fraser Birrell
Background: Radiographs are the main outcome measure in epidemiological studies of osteoarthritis (OA). Ultrasound imaging has unique advantages in that it involves no ionising radiation, is easy to use and visualises soft tissue structures. Our objective was to measure the inter-rater reliability and validity of ultrasound imaging in the detection of features of knee OA. Methods: Eighteen participants from a community cohort, had both knees scanned by two trained musculoskeletal sonographers, up to six weeks apart. Inter-rater reliability for osteophytes, effusion size and cartilage thickness was calculated by estimating Kappa (kappa) and Intraclass correlation coefficients (ICC), as appropriate. A measure of construct validity was determined by estimating kappa between the two imaging modalities in the detection of osteophytes. Results: Reliability: kappa for osteophyte presence was 0.77(right femur), 0.65(left femur) and 0.88 for both tibia. ICCs for effusion size were 0.70(right) and 0.85(left). Moderate to substantial agreement was found in cartilage thickness measurements. Validity: For osteophytes, kappa was moderate to excellent at 0.52(right) and 0.75(left). Conclusion: Substantial to excellent agreement was found between ultrasound observers for the presence of osteophytes and measurement of effusion size; it was moderate to substantial for femoral cartilage thickness. Moderate to substantial agreement was observed between ultrasound and radiographs for osteophyte presence.
Author(s): Abraham AM, Goff I, Pearce MS, Francis RM, Birrell F
Publication type: Article
Publication status: Published
Journal: BMC Musculoskeletal Disorders
Print publication date: 06/04/2011
Date deposited: 10/11/2011
ISSN (electronic): 1471-2474
Publisher: BioMed Central Ltd.
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