Abstract
Objective
Few imaging studies have investigated cartilage in gout. Magnetic resonance imaging (MRI) can image cartilage damage and also reveals other features of gouty arthropathy. The objective was to develop and validate a system for quantifying cartilage damage in gout.
Methods
3-T MRI scans of the wrist were obtained in 40 gout patients. MRI cartilage damage was quantified using an adaptation of the radiographic Sharp van der Heijde score. Two readers scored cartilage loss at 7 wrist joints: 0 (normal), 1 (partial narrowing), 2 (complete narrowing) and concomitant osteoarthritis was recorded. Bone erosion, bone oedema and synovitis were scored (RAMRIS) and tophi were assessed. Correlations between radiographic and MRI cartilage scores were investigated, as was the reliability of the MRI cartilage score and its associations.
Results
The GOut MRI Cartilage Score (GOMRICS) was highly correlated with the total Sharp van der Heijde (SvdH) score and the joint space narrowing component (R = 0.8 and 0.71 respectively, p < 0.001). Reliability was high (intraobserver, interobserver ICCs = 0.87 [0.57–0.97], 0.64 [0.41–0.79] respectively), and improved on unenhanced scans; interobserver ICC = 0.82 [0.49–0.95]. Cartilage damage was predominantly focal (82 % of lesions) and identified in 40 out of 280 (14 %) of joints. Cartilage scores correlated with bone erosion (R = 0.57), tophus size (R = 0.52), and synovitis (R = 0.55), but not bone oedema scores.
Conclusions
Magnetic resonance imaging can be used to investigate cartilage in gout. Cartilage damage was relatively uncommon, focal, and associated with bone erosions, tophi and synovitis, but not bone oedema. This emphasises the unique pathophysiology of gout.
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Acknowledgements
The authors acknowledge the expert assistance of the MRI technicians at Specialist Radiology and MRI Greenlane, especially Mrs Desiree Mulders. We also acknowledge the assistance of Auckland rheumatology nurses Megan Williams and Barbara Curteis, and we wish to thank the patients and their relatives for involvement in this study.
Conflict of interest
Q. Reeves is part-owner of Specialist Radiology and MRI, Greenlane, where the MRI scans were performed. However, all funding for the study (including the scans) was from the Auckland Medical Research Foundation, which is a charitable institution in New Zealand. All other authors have declared that they have no conflicts of interest.
Sources of support
I. Popovich was funded to take part by the University of Auckland Summer Studentship programme.
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Popovich, I., Dalbeth, N., Doyle, A. et al. Exploring cartilage damage in gout using 3-T MRI: distribution and associations with joint inflammation and tophus deposition. Skeletal Radiol 43, 917–924 (2014). https://doi.org/10.1007/s00256-014-1869-7
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DOI: https://doi.org/10.1007/s00256-014-1869-7