Abstract
Objective
To investigate the significance of lumbrical muscle enhancement (LME) on magnetic resonance imaging (MRI) in rheumatoid arthritis (RA).
Materials and methods
Blinded to the diagnoses, contrast-enhanced bilateral hand MRIs of patients with suspected early RA between 2014 and 2019 were reviewed by two observers for the presence and degree (weak/strong) of LME. The presence of other inflammatory findings was also noted. The patients were then stratified into RA (n = 41), control (n = 31), and other arthritides groups(n = 28) based on their final diagnoses in the hospital records within the following 12 months. Categorical variables were compared by chi-square test or Fisher’s exact test. Differences among the groups were evaluated by one-way ANOVA or Kruskal–Wallis tests. When the p-value from the Kruskal–Wallis test was statistically significant, multiple comparison test was used to identify group differences. Correlations between LME and flexor tenosynovitis were evaluated by Spearman rank correlation test. The agreement between two observers was assessed by Cohen’s Kappa (κ) statistic. P-value < 0.05 was considered as statistically significant.
Results
There were 100 patients (88 females) with mean age of 47.2 ± 11.2. There were no significant differences for age or sex between groups (p = 0.17, p = 0.84, respectively). RA patients showed significantly more frequent (p < 0.001) and stronger LME (p = 0.001).
There were no correlations between LME and flexor tenosynovitis (p > 0.05). Interrater agreement for the degree of LME on right and left sides was substantial (κ = 0.74, κ = 0.67, respectively).
Conclusion
RA patients demonstrated significantly more frequent and stronger LME with substantial interrater agreement. LME could constitute a subtle radiological clue for early RA.
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Acknowledgements
The authors gratefully acknowledge the support of the Turkish Fulbright Commission, the Scientific and Technological Research Council of Turkey, and National Institutes of Health (NIH) (grant numbers: R01AR078917 and R01AI125080) for Zehra Akkaya’s previous and ongoing research endeavors, unrelated to the subject matter of this manuscript. Zehra Akkaya also received consultation fees from Calico Life Sciences LLC, unrelated to the subject matter of this research. The authors confirm that the aforementioned funding sources did not play a role in the design, implementation, or analysis of this study.
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Akkaya, Z., Çoruh, A.G., Ünal, S. et al. Lumbrical muscle enhancement on MRI and its association with rheumatoid arthritis. Skeletal Radiol 52, 1975–1985 (2023). https://doi.org/10.1007/s00256-023-04353-0
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DOI: https://doi.org/10.1007/s00256-023-04353-0