Transient Thermal Behavior and Diabetic Foot

Study Overview
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Brief Summary
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In our study, the investigators propose to analyze the transient thermal responses taken at the level of the sole of the foot, following the application of a cold stimulus. By combining a spatio-temporal analysis of these temperature fields and a thermal modeling of the heat transfer in the thickness of the foot, the investigators want to highlight differences between healthy feet vs. pathological feet. Therefore, the investigators will determine the transient thermal responses at the level of the sole of the foot and correlate them with the podological grade.

Detailed Description
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Both plants of the patient's feet will be observed by a thermal camera. Static observations (taking a single image), or dynamic (taking a series of images) of the foot, will be made. In the latter case, the observation will be done after a brisk walk of 6 min. The instruction given to patients will be to go the furthest in 3 min and then come back in 3 min, all while walking. The observation will be made by cameras without contact. These thermal cameras are non-invasive and non-ionizing, there is no risk related to their use. The camera will be placed on a tripod, a few tens of centimeters from the foot, and connected to a laptop (for the images acquisition). A wooden box, painted black, will be placed around both feet to protect the scene from parasitic thermal radiation that can disturb temperature variations. Foam will protect the skin / wood interface. Electric resistances, fixed on the box, will be placed in the field of vision of the thermal camera to guarantee the good treatment of the images. These resistors will never be in contact with the patient. The area filmed by the camera will be limited to the sole arch and, sometimes, the hand of patients to see if a thermal anomaly is also present on this member.

Official Title
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Transient Thermal Behavior and Diabetic Foot

Conditions
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Diabetic Patients Type 1 and 2, Podologic Grade From 0 to 3

Intervention / Treatment
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* Other: Infrared Thermography


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Diabetic subjects (type 1 and 2) age above 18 years old able to walk affiliate to insurance regimen Exclusion Criteria: unable to stay motionless pregnancy subjects with feet wound

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Study participants<br>Measurements of the temperature of the plantar arch by thermal imaging. Result analysis regarding podologic grade ( 0-1-2-3) | Other: Infrared Thermography<br>* Measurements of the temperature of the plantar arch by thermal imaging (Infrared Thermography)<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Thermal signals measured on plantar foot | Determine the transient thermal responses at the plantar foot | At the inclusion | 
| Correlation with podologic grade | The classification of foot risk, mentioned in 2007 in the HAS report, is as follows ([HAS 2007]) Diabetic Foot Report http://www.has-sante.fr/portail/upload/docs/application/pdf/_foot_diabetic.pdf, 2007 : Grade 0: absence of sensitive neuropathy Grade 1: isolated sensitive neuropathy Grade 2: sensitive neuropathy associated with arteriopathy of the lower limbs and/or foot deformities Grade 3: history(s) of foot ulceration (grade3a) and/or lower limb amputation (grade 3b) | At the inclusion | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Microcirculation, Infrared Thermography, Diabetic foot, Six minutes walking test