Introduction The pathophysiology of Charcot neuroarthropathy (CN) remains unclear. There are a number of hypotheses but these are not exclusive. In its clinical presentation, this complication intersects with the semiology of diabetic-induced neuropathy, such as peripheral hypervascularization and the appearance of arteriovenous shunt. The EPICHAR study is as yet an unpublished cohort of people living with diabetes complicated by CN (in active or chronic phase). Based on the findings of the EPICHAR study, this study aimed to investigate whether a reduction in the rate of hyperglycemia accompanies the onset of an active phase of CN. Research design and methods Hemoglobin A1c (HbA1c) levels were assessed 3 months (M3) and 6 months (M6) before the diagnosis of active CN (M0). Results 103 patients living with diabetes and presenting active CN were included between January and December 2019 from the 31 centers participating in this study (30 in France and 1 in Belgium). The mean age of the participants was 60.2 +/- 12.2 years; the vast majority were men (71.8%) living with type 2 diabetes (75.5%). Mean HbA1c levels significantly declined between M6 (median 7.70; 01, 03: 7.00, 8.55) and M3 (median 7.65; 01, 03: 6.90, 8.50) (p=0.012), as well as between M6 and M0 (median 7.40; 01, 03: 6.50, 8.50) (p=0.014). No significant difference was found between M3 and M0 (p=0.072). Conclusions A significant reduction in HbA1c levels seems to accompany the onset of the active phase of CN.Read less <