Abstract
Objective
To evaluate the utility of apparent diffusion coefficient (ADC) measurements from ankle MRI diffusion-weighted imaging (DWI) studies in identifying neuropathic changes in diabetic patients.
Methods
In total, 109 consecutive ankle MRI scans (n = 101 patients) at a single tertiary care county hospital from November 1, 2019, to July 11, 2021, who met the inclusion criteria were identified. Patients were divided into 2 cohorts: diabetic (n = 62) and non-diabetic (n = 39). Demographics, HgbA1c, neuropathy diagnosis, and image quality data were collected. Abductor hallucis (AH) ADC mean and minimum (min) values and posterior tibial nerve (PTN) ADC mean and minimum values were measured. Student t-test and Pearson’s correlation coefficient analysis were performed using R.
Results
Diabetic patients had significantly higher mean and min ADC values (× 10−3 mm2/s) of the AH muscle (mean: 1.77 vs 1.39, p < 0.001; min: 1.51 vs 1.06, p < 0.001) and PTN (mean: 1.65 vs 1.18, p < 0.001; min: 1.33 vs 0.95, p < 0.001) compared to non-diabetic patients. HgbA1c positively correlated with AH and PTN ADC mean values (AH: p = 0.036; PTN: p = 0.004).
Conclusion
Our data suggests that an increasing diffusivity of water as quantified by ADC across neuronal and muscular membranes is a consequence of the pathophysiology of the disease. Thus, ankle MRI-DWI studies are useful in identifying neuropathic changes in diabetic patients and quantifying the severity noninvasively.
Key Points
• Diabetic patients had significantly higher mean and minimum ADC values of the abductor hallucis muscle and posterior tibial nerve compared to non-diabetic patients.
• HgbA1c positively correlated with ADC mean values (AH: p = 0.036; PTN: p = 0.004) suggesting that an increasing diffusivity of water across neuronal and muscular membranes is a consequence of the pathophysiology of diabetic neuropathy.
• Ankle MRI DWI can be used clinically to non-invasively identify neuropathic changes due to diabetes mellitus.
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Abbreviations
- AH:
-
Abductor hallucis
- DM:
-
Diabetes mellitus
- MRN:
-
Magnetic resonance neurography
- PTN:
-
Posterior tibial nerve
- ROS:
-
Reactive oxygen species
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The scientific guarantor of this publication is Avneesh Chhabra, MD, MBA.
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Avneesh Chhabra: Consultant: ICON Medical and TREACE Medical Concepts Inc., Book Royalties: Jaypee, Wolters, Speaker: Siemens, Medical advisor, and research grant: Image biopsy Inc. Additionally, Avneesh Chhabra is a Deputy Editor of European Radiology. He has not taken part in the review or selection process of this article. Others: None.
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One of the authors has significant statistical expertise. No complex statistical methods were necessary for this paper.
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• Retrospective
• cross-sectional study
• performed at one institution
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Amaya, J., Lue, B., Silva, F.D. et al. Diffusion-weighted MR imaging and utility of ADC measurements in characterizing nerve and muscle changes in diabetic patients on ankle DWI studies: a cross-sectional study. Eur Radiol 33, 4855–4863 (2023). https://doi.org/10.1007/s00330-023-09466-7
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DOI: https://doi.org/10.1007/s00330-023-09466-7