Osteomyelitis is a frequent complication of diabetic foot ulcer. Several therapeutic strategies are used : medical treatment with antibiotics and foot offloading or surgical treatment consisting in the resection of infected bone and a shorter antibiotic course. The medical treatment risk is a longer healing time and a risk of bone infection relapse. The surgical treatment risk is the ulcer relapse because of the modification of the foot structure. These treatments need to be compared in terms of benefit/risk ratio. Our hypothesis is : 1) in the medical treatment group a 7 month mean healing time of and a 15% osteomyelitis recurrence rate;2) in the medical-surgical treatment group a 4 month mean healing time and a 10% osteomyelitis recurrence rate.