There are various grading methods for diabetic foot, commonly used are the three-stage classification method, Wagner grading, and TEXAS University diabetic foot grading and staging method mentioned earlier. Among them, the Wagner grading method is as follows? Grade 0: foot at risk of foot ulceration, no open skin lesions. grade 1: surface ulceration, no clinical infection. grade 2: deeper ulcerated infected lesions, often combined with soft tissue inflammation, no abscess or infection of bone. grade 3: deep infection with bone histopathy or abscess. grade 4: bone defect, partial gangrene of toe and foot. grade 5: major or total gangrene of foot.