UT Southwestern Diabetic Foot Ulcers (DFU) and Osteomyelitis (DFO) Recruitment Database, Data and Tissue Repository

Subjects will be consented during a scheduled visit for standard care at the Clements University Hospital, UT Southwestern Wound Clinic, Parkland Hospital or the Parkland ASC Wound Clinic. There will be 2 study visits: Baseline and operating room visit. At the time of scheduled procedures or laboratory blood draws (as part of standard of care or SOC), soft tissue (from wound debridement or surgery), and bone if possible (from surgery or bone biopsy) will be obtained for histological sectioning and/or laboratory analysis. Tissue and or bone (surgical waste will be sent to the plastic surgery laboratory for storage and analysis.

Tissues with or without bone will be sent to the clinical pathology core for paraffin/frozen sectioning. Histological sections will be used for immunostaining and laser capture microdissection to evaluate tissue ultrastructure and region /cell specific gene expression analysis. Samples will also be sent to the Research and Testing Laboratory in Lubbock, TX for bacterial analysis and to Dermagenesis, LLC in Pompano Beach, FL for isolation of cellular components from different wound specimens and to define characteristics such as proliferation and migration rates. Bone (surgical waste) will also be sent to the 1st Department of Internal Medicine, Laiko General Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece, for isolation of cellular components and cytokine analysis. In case infected bone is collected during surgery, it will be fixed and processed in the imaging core laboratory of our facility to evaluate biofilm with a Scanning Electron Microscope.

Relevant information obtained from the medical record will include age, gender, ethnicity, size (dimensions) of ulcer, location of ulcer, duration of ulcer, results of neurological and vascular testing, medical comorbidities, social history, laboratory data, offloading, and history of prior treatment (limited data set with no personal identifying information). Patient information will be de-identified and assigned a code. Bone and tissue samples will be banked in the UT Southwestern Department of Plastic Surgery Laboratory and tested for bacteria, biomarkers, inflammatory cytokines and other indicators of infection. All samples will be kept under the control of the principal investigator and used until exhausted. We will also follow these subjects for two (2) years to identify incidents of care and hospital readmissions for diabetic foot complications through review of the subject's electronic medical record.