• 1
    Taylor W, Gladman D, Helliwell P, Marchesoni A, Mease P, Mielants H, and the CASPAR Study Group. Classification criteria for psoriatic arthritis: development of new criteria from a large international study. Arthritis Rheum 2006; 54: 266573.
  • 2
    Marsal S, Armadans-Gil L, Martinez M, Gallardo D, Ribera A, Lience E. Clinical, radiographic and HLA associations as markers for different patterns of psoriatic arthritis. Rheumatology (Oxford) 1999; 38: 3327.
  • 3
    Battistone MJ, Manaster BJ, Reda DJ, Clegg DO. The prevalence of sacroilitis in psoriatic arthritis: new perspectives from a large multicenter cohort. A Department of Veterans Affairs Cooperative Study. Skeletal Radiol 1999; 28: 196201.
  • 4
    Gladman DD, Shuckett R, Russell ML, Thorne JC, Schachter RK. Psoriatic arthritis (PSA): an analysis of 220 patients. Q J Med 1987; 238: 12741.
  • 5
    Mease PJ, Antoni CE, Gladman DD, Taylor WJ. Psoriatic arthritis assessment tools in clinical trials. Ann Rheum Dis 2005; 64 Suppl 2: ii4954.
  • 6
    Gladman DD, Inman R, Cook RJ, Maksymowych W, Braun J, Davis JC, et al. International spondyloarthritis reliability exercise: the INSPIRE study. II. Assessment of peripheral joints, enthesitis and dactylitis. J Rheumatol 2007; 34: 17405.
  • 7
    Taylor WJ, Zmierczack HG, Helliwell PS. Problems with the definition of axial and peripheral disease patterns in psoriatic arthritis. J Rheumatol 2005; 32: 9747.
  • 8
    Gladman DD. Axial disease in psoriatic arthritis. Curr Rheumatol Rep 2007; 9: 45560.
  • 9
    Gladman DD, Brubacher B, Buskila D, Langevitz P, Farewell VT. Differences in the expression of spondyloarthropathy: a comparison between ankylosing spondylitis and psoriatic arthritis patients. Clin Invest Med 1993; 16: 17.
  • 10
    Helliwell PS, Hickling P, Wright V. Do the radiological changes of classic ankylosing spondylitis differ from the changes found in the spondylitis associated with inflammatory bowel disease, psoriasis, and reactive arthritis? Ann Rheum Dis 1998; 57: 13540.
  • 11
    Gladman DD, Inman RD, Cook RJ, van der Heijde D, Landewe RB, Braun J, et al. International spondyloarthritis interobserver reliability exercise: the INSPIRE study. I. Assessment of spinal measures. J Rheumatol 2007; 34: 17339.
  • 12
    Gladman DD, Mease PJ, Healy P, Helliwell PS, Fitzgerald O, Cauli A, et al. Outcome measures in psoriatic arthritis. J Rheumatol 2007; 34: 115966.
  • 13
    Moll JM, Wright V. Psoriatic arthritis. Semin Arthritis Rheum 1973; 3: 5578.
  • 14
    Zochling J, Braun J, van der Heijde D. Assessment in ankylosing spondylitis. Best Pract Res Clin Rheumatol 2006; 20: 52137.
  • 15
    Viitanen JV, Heikkila S, Kokko ML, Kautiainen H. Clinical assessment of spinal mobility measurements in ankylosing spondylitis: a compact set for follow-up and trials? Clin Rheumatol 2000; 19: 1317.
  • 16
    Haywood KL, Garratt AM, Jordan K, Dziedzic K, Dawes PT. Spinal mobility in ankylosing spondylitis: reliability, validity and responsiveness. Rheumatology (Oxford) 2004; 43: 7507.
  • 17
    Heuft-Dorenbosch L, Spororenberg A, van Tubergen A, Landewe R, van der Tempel H, Mielants H, et al. Assessment of enthesitis in ankylosing spondylitis. Ann Rheum Dis 2003; 62: 12732.
  • 18
    Garrett S, Jenkinson T, Kennedy LG, Whitelock H, Gaisford P, Calin A. A new approach to defining disease status in ankylosing spondylitis: the Bath Ankylosing Spondylitis Disease Activity Index. J Rheumatol 1994; 21: 228691.
  • 19
    Calin A, Garrett S, Whitelock H, Kennedy LG, O'Hea J, Mallorie P, et al. A new approach to defining functional ability in ankylosing spondylitis: the development of the Bath Ankylosing Spondylitis Functional Index. J Rheumatol 1994; 21: 22815.
  • 20
    Ware JE, Kosinski M, Keller SD. A 12-item short-form health survey: construction of scales and preliminary tests of reliability and validity. Med Care 1996; 34: 22033.
  • 21
    Van der Linden S, Valkenburg HA, Cats A. Evaluation of diagnostic criteria for ankylosing spondylitis: a proposal for modification of the New York criteria. Arthritis Rheum 1984; 27: 3618.
  • 22
    Wanders AJ, Landewe RB, Spoorenberg A, Dougados M, van der Linden S, Mielants H, et al. What is the most appropriate radiologic scoring method for ankylosing spondylitis? A comparison of the available methods based on the Outcome Measures in Rheumatology Clinical Trials filter. Arthritis Rheum 2004; 50: 262232.
  • 23
    Kavanaugh A, Cassell S. The assessment of disease activity and outcomes in psoriatic arthritis. Clin Exp Rheumatol 2005; 23 Suppl 39: S1427.
  • 24
    Fransen J, Antoni C, Mease PJ, Uter W, Kavanaugh A, Kalden JR, et al. Performance of response criteria for assessing peripheral arthritis in patients with psoriatic arthritis: analysis of data from randomised controlled trials of two tumor necrosis factor inhibitors. Ann Rheum Dis 2006; 65: 13738.
  • 25
    Nash P. Therapies for axial disease in psoriatic arthritis: a systematic review. J Rheumatol 2006; 33: 14314.
  • 26
    Taylor WJ, Marchesoni A, Arreghini M, Sokoll K, Helliwell PS. A comparison of the performance characteristics of classification criteria for the diagnosis of psoriatic arthritis. Semin Arthritis Rheum 2004; 34: 57584.
  • 27
    Chandran V, O'Shea FD, Schentag CT, Inman RD, Gladman DD. Relationship between spinal mobility and radiographic damage in ankylosing spondylitis and psoriatic spondylitis: a comparative analysis. J Rheumatol 2007; 34: 24635.
  • 28
    Taylor WJ, Harrison AA. Could the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) be a valid measure of disease activity in patients with psoriatic arthritis? Arthritis Rheum 2004; 51: 3115.