Effect of Age on Active and Structural Magnetic Resonance Imaging Lesions in Sacroiliac Joints of Healthy Individuals and Patients With Nonspecific Back Pain

U. Weber, MD, Medical Centre Zenit, Department of Rheumatology, Schaffhausen, Switzerland.

S. Seven, MD, PhD, Copenhagen Center for Arthritis Research (COPECARE), Center for Rheumatology and Spine Diseases, Centre for Head and Orthopaedics, Rigshospitalet, Glostrup, Denmark.

S.J. Pedersen, MD, PhD, Copenhagen Center for Arthritis Research (COPECARE), Center for Rheumatology and Spine Diseases, Centre for Head and Orthopaedics, Rigshospitalet, Glostrup, and Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.

M. Østergaard, MD, PhD, DMSc, Copenhagen Center for Arthritis Research (COPECARE), Center for Rheumatology and Spine Diseases, Centre for Head and Orthopaedics, Rigshospitalet, Glostrup, and Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.

P.M. Machado, MD, PhD, Centre for Rheumatology and Department of Neuromuscular Diseases, University College London, and National Institute for Health Research University College London Hospitals Biomedical Research Centre, University College London Hospitals NHS Foundation Trust, and Department of Rheumatology, Northwick Park Hospital, London North West University Healthcare NHS Trust, London, UK.

S. Wichuk, BA, Department of Medicine, and Department of Radiology and Diagnostic Imaging, University of Alberta, Edmonton, Alberta, Canada.

X. Baraliakos, MD, Rheumazentrum Ruhrgebiet, Herne, and Ruhr-Universität Bochum, Bochum, Germany.

R.G.W. Lambert, MB BCh, Department of Radiology and Diagnostic Imaging, University of Alberta, Edmonton, Alberta, Canada.

W.P. Maksymowych, MB ChB, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada.