Abnormal glucose metabolism gradually impairs sensation in both feet. Impaired sensation leads to recurrent attacks of inflammation "acute Charcot arthritis". Eventually, the foot becomes deformed with abnormal shape of the plantar surface. During walking, both neuropathy and deformities cause abnormal distribution of pressure with some points in the plantar surface having a very high pressure. This high pressure leads to skin ulceration "pressure ulcer". These pressure ulcers tend to be recurrent or chronic as long as the problem of high pressure is not resolved.