Diabetic Foot Ulcer Classification and Management

Introduction to Classification Systems

The University of Texas classification system is a 4×4 matrix that combines wound depth grades (0-3) with stages (A-D) based on infection and ischemia status to categorize diabetic foot ulcers and predict complication risk, as recommended by the American Diabetes Association 1, 2

The UT system uses depth grades (0-3) and stages (A-D) to classify diabetic foot ulcers, with Grade 3 being a wound penetrating to bone or deep abscess, according to the Infectious Diseases Society of America 1
The system also categorizes ulcers into stages (A-D) based on infection and ischemia status, with Stage D indicating both infection and ischemia present, as described by the International Working Group on the Diabetic Foot 2

The UT system requires vascular assessment using clinical signs plus non-invasive testing to determine ischemia status, as recommended by the American College of Cardiology 2
The system successfully predicts complication likelihood, with higher grades and stages correlating with significantly higher amputation rates in wounds deeper than superficial ulcers, according to the American Diabetes Association 1, 6

The UT classification system does not include ulcer size/area, which independently predicts outcomes, as noted by the International Working Group on the Diabetic Foot 2
The system does not assess loss of protective sensation (neuropathy), critical for offloading recommendations, according to the American Diabetes Association 2, 4
The International Working Group on the Diabetic Foot strongly recommends against using the UT system to predict individual patient outcomes due to weak evidence quality and poor applicability 2, 5

For routine clinical communication and documentation, the SINBAD system is recommended, which includes site, ischemia, neuropathy, bacterial infection, area, and depth, as suggested by the International Working Group on the Diabetic Foot 5, 3
When infection is present or suspected, the IDSA/IWGDF infection classification system (grades 1-4) should be applied to guide antibiotic selection and hospitalization decisions, according to the Infectious Diseases Society of America 5, 3, 1, 6