4Karim Z,Wakcfield RJ,Qninn M,et al. Validation and Reproducibility of Ultrasonography in the Detection of Synovitis in the Knee:A Comparison With Arthroscopy and Clinical Examination [J]. Arthritis Rheum,2004,50: 387-394.
5Carotti M, Saliffi F, Manganelli P,et al. Power Doppler sonography in the assessment of synovial tissue of the knee joint in rheumatoid arthritis: a preliminary experience [J]. Ann Rheum Dis,2002,61:877-882.
6Ostergaard M,Wiell C. Ultrasonography in rheumatoid arthritis: a very promising method still needing more validation [J]. Curr Opin Rheumatol, 2004,16:223-230.