In an asymptomatic population, we investigated the relationships between glycated haemoglobin (HbA1c) and cartilage T2 relaxation time at the knee joint level. Fourteen and 17 participants with high and normal levels of HbA1c were recruited, respectively. A blood sample was used to determine the HbA1c level. T2 relaxation time (T2) of the superficial and deep parts of the femoral cartilage in the anterior, central, and posterior topographical sites was calculated using magnetic resonance (1.5 T) images. Each participant completed a knee injury and osteoarthritis outcome score questionnaire (KOOS) and a series of biomechanical analyses while running at their self-selected speed. The group with a high level of HbA1c had a lower score of KOOS symptoms than the other group (P < 0.05). HbA1c was found to be negatively related to the KOOS symptoms score. The group with a high level of HbA1c had low T2 values in all of the investigated topographical sites of the knee femoral cartilage (P < 0.05 in all cases). T2 was negatively correlated with HbA1c levels in all investigated knee femoral cartilage regions. Our data suggest that the subjects with high levels of HbA1c were those with low knee joint symptoms and lower values of T2. These results indicate that HbA1c could be correlated with cartilage deterioration due to its ability to dehydrate collagen fibre, possibly acting as a risk factor for the development of osteoarthritis.

Department of Cybernetics and Biomedical Engineering Faculty of Electrical Engineering and Computer Science VSB Technical University of Ostrava 17 Listopadu 15 Ostrava Poruba 70800 Czech Republic

Department of Diagnostic Radiology Oulu University Hospital Oulu Finland

Departments of Neurosciences Biomedicine and Movement Sciences University of Verona Verona Italy

Human Motion Diagnostic Center Department of Human Movement Studies University of Ostrava 70200 Ostrava Czech Republic

Physics and Technology Research Unit of Medical Imaging University of Oulu Oulu Finland

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