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Ultrasound of knee osteoarthritis: interobserver agreement and correlation with Western Ontario and McMaster Universities Osteoarthritis

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Abstract

The aim of this work was to assess the reproducibility of ultrasound findings of knee osteoarthritis and to correlate ultrasound findings with Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC). Prospective study was conducted upon 80 patients (56 F, 24 M; mean age 57 years) with primary osteoarthritis of knee joint. All patients underwent clinical assessment with calculation of WOMAC and high-resolution ultrasound of the knee joint. The ultrasound images were analyzed for cartilage thinning, osteophytes, synovial effusion, synovial proliferation, popliteal cyst, and meniscal protrusion. Image analysis was performed by two readers and linear regression analysis was used to determine association of ultrasound findings with WOMAC. There was excellent inter-observer agreement of both readers for cartilage thinning (k = 0.99, P = 0.001), osteophytes (k = 0.94, P = 0.001), synovial effusion (k = 0.98, P = 0.001), synovial thickening (k = 0.96, P = 0.001), popliteal cyst (k = 1.00, P = 0.001), and meniscal protrusion (k = 0.86, P = 0.001). There was significant association of WOMAC with cartilage changes (t = 3.406, 3.302, P = 0.001), osteophytes (t = 3.841, 3.006, P = 0.001), and synovial effusion (t = 4.140 and 2.787, P = 0.05) of both readers. We concluded that ultrasound is a reproducible method for assessment of knee osteoarthritis and well correlated with WOMAC.

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Authors and Affiliations

  1. Department of Diagnostic Radiology, Mansoura Faculty of Medicine, Mansoura University, Elgomheryia Street, Mansoura, 35512, Egypt

    Ahmed Abdel Khalek Abdel Razek

  2. Department of Rheumatology and Rehabilitation, Mansoura Faculty of Medicine, Mansoura University, Mansoura, Egypt

    Sherif Refaat El-Basyouni

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  1. Ahmed Abdel Khalek Abdel Razek
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Correspondence to Ahmed Abdel Khalek Abdel Razek.

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Razek, A.A.K.A., El-Basyouni, S.R. Ultrasound of knee osteoarthritis: interobserver agreement and correlation with Western Ontario and McMaster Universities Osteoarthritis. Clin Rheumatol 35, 997–1001 (2016). https://doi.org/10.1007/s10067-015-2990-2

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  • DOI: https://doi.org/10.1007/s10067-015-2990-2

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