To the Editor:
The report by Christiansen, et al1 again emphasizes one of the limitations to clinical application of our diagnostic paradigms. Sacroiliac joints (SIJ) have highly irregular contours with 3-D topography2. Imaging artifacts related to the limited resolution of computed tomography (related to the subchondral bone thickness of SIJ) compromises its reliability in identifying or excluding not only erosions, but also bridging or fusion …
Address correspondence to Dr. B. Rothschild, Department of Medicine, West Virginia University School of Medicine, Morgantown, West Virginia 26506, USA. E-mail: spondylair{at}gmail.com