The formation of friction blisters on the foot: the development of a laboratory-based blister creation model

Authors


Address:

Farina Hashmi

Research Fellow

Centre for Health Sciences Research

School of Health Sciences

Frederick Road Campus

University of Salford

M6 6PU, England

Tel: +44 161 295 5314

Fax: +44 161 295 24 32

e-mail: F.Hashmi@salford.ac.uk

Abstract

Background/Purpose

Friction blisters on the foot are a debilitating pathology that have an impact on activities of daily living and can severely impair function. The purpose of this study was to test the hypotheses that digital infrared thermographic imaging will reveal: 1) a correlation between load application to the skin and the creation of blisters, and 2) a correlation between thermographic readings and contact thermometric temperatures.

Methods

Apparatus was developed to cause the formation of heel blisters through controlled load application (70 kPa). One foot of each of the 30 healthy volunteers (21 men and 9 women), with an age range of 31 ± 8 years, was subjected to load until a blister formed, after which load application ceased and temperature measurements were taken at set times during the following 5.5 h. Temperature measurements were also taken using a contact thermometer.

Results

The majority of the participants (77%) blistered within 18 min of load application. All the blisters created showed significant increases in local temperature compared to baseline during blister creation (< 0.001) and 30 min post-blister creation (P < 0.001). There was a strong correlation between contact thermometry and thermographic temperature data (r > 8).

Conclusion

These results suggest that thermographic images may prove useful for the remote assessment of traumatically damaged foot skin.

Ancillary