Summary
The knees of fifty-two patients suffering from rheumatoid arthritis (RA), 22 patients with seronegative spondylarthopathies (SA) as well as of 20 healthy volunteers were examined by magnetic resonance imaging (MRI). Osseous erosions (RA 52%-SA 18%; P<0.005), Baker cysts (RA 56%-SA 12%; P<0.005), pannus formation (RA 67%-SA 36%; P<0.05), and cartilage thinning with narrowing of the joint space (RA 46%-SA 18%; P<0.05) proved to be more frequent MRI findings in patients with RA. Additionally, in patients with RA erosions were more extensive. Follow-up MRI examinations of 19 patients revealed an improvment in MRI changes in SA within an average interval of 6 months. No substantial changes were noted in 7 of 13 RA patients. Quantitative and qualitative MRI findings of knee arthritis differ in patients with RA and SA and this was statistically significant. However, as there is considerable overlap of the MRI and radiographic changes in both groups the discriminating diagnostic value in the individual case was limited.
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Dedicated to Professor Dr. W. Wenz on his 65th birthday
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Mundinger, A., Ioannidou, M., Meske, S. et al. MRI of knee arthritis in rheumatoid arthritis and spondylarthropathies. Rheumatol Int 11, 183–186 (1991). https://doi.org/10.1007/BF00332559
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DOI: https://doi.org/10.1007/BF00332559