Assumptions and Objectives: The working hypotheses are: 1 - subjects with type 1 diabetes and / or type 2, compared to subjects without diabetes are at risk for osteopenia and / or abnormal bone structure the foot (calcaneus and ankle) can lead to bone deformities, fractures and final stage of Charcot foot. These anomalies are favored by the presence of peripheral neuropathy and plasma levels of advanced glycation end products higher than in diabetic subjects without bone abnormalities.