Abstract
Objectives
To compare the amount of fluid in synovial sheaths of the ankle before and after running. Our hypothesis was that this amount would increase and that the threshold for what is normally acceptable should be adjusted after physical activity.
Methods
Twenty-one healthy volunteers (n = 42 ankles) ran for 40 min on a treadmill. They underwent 3 T MRI before and immediately after running using a dedicated ankle coil. The images were stored and subsequently measured in a standardized way and independently read by two readers for fluid in the tendon sheaths in the retro and inframalleolar area. Statistics were performed for each tendon (Wilcoxon signed rank test), and also for the pooled data. Intraclass correlation coefficients were calculated.
Results
For reader 1, for all tendons the values after running increased without reaching statistical significance. For reader 2 this was not the case for all tendons but for most. When all the data were pooled (n = 800 measurements), the statistical difference before and after running was significant (p < 0.001).
Conclusion
Data pre and post-running show a trend of increasing synovial fluid, however, not significant for each individual tendon. The pooled data for all tendons, (n = 800) show a statistically significant increase after running (p < 0.001). The clinical implication is that the threshold for normally acceptable fluid should be adjusted if the patient undergoes an MR study after recent physical activity.
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Availability of data and materials
All the available measurement data are provided in the manuscript.
Abbreviations
- PL:
-
Peroneus longus
- PB:
-
Peroneus brevis
- TP:
-
Tibialis posterior
- FDL:
-
Flexor digitorum longus
- FHL:
-
Flexor halluces longus
- TA:
-
Tibialis anterior
- EDL:
-
Extensor digitorum longus
- EH:
-
Extensor hallucis
- Pre:
-
Prior to running
- Post:
-
Following the running exercise
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MD: study design, manuscript writing, SD: data collection, VDG: data collection, NB: statistical analysis, JDM: study design, manuscript review, MS: manuscript writing and review, SP: study design, data collection, IW: study design, experiment, data analysis.
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De Maeseneer, M., Doering, S., De Grove, V. et al. Physical activity increases synovial fluid in ankle tendon sheaths: an adjustment of MR Criteria is needed. Surg Radiol Anat 45, 193–199 (2023). https://doi.org/10.1007/s00276-022-03068-6
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DOI: https://doi.org/10.1007/s00276-022-03068-6