The three-dimensional shapes of underground coal miners’ feet do not match the internal dimensions of their work boots

Abstract Mining work boots provide an interface between the foot and the ground, protecting and supporting miners’ feet during lengthy coal mining shifts. Although underground coal miners report the fit of their work boots as reasonable to good, they frequently rate their boots as uncomfortable, suggesting that there is a mismatch between the shape of their feet and their boots. This study aimed to identify whether dimensions derived from the three-dimensional scans of 208 underground coal miners’ feet (age 38.3 ± 9.8 years) differed from the internal dimensions of their work boots. The results revealed underground coal miners wore boots that were substantially longer than their feet, possibly because boots available in their correct length were too narrow. It is recommended boot manufacturers reassess the algorithms used to create boot lasts, focusing on adjusting boot circumference at the instep and heel relative to increases in foot length. Practitioner Summary: Fit and comfort ratings suggest a mismatch between the shape of underground coal miners’ feet and their boots exists. This study examined whether three-dimensional scans of 208 miners’ feet differed from their boot internal dimensions. Miners wore boots substantially longer than their feet, possibly due to inadequate width.

[1]  Daniel R. Bonanno,et al.  Development and evaluation of a tool for the assessment of footwear characteristics , 2009, Journal of foot and ankle research.

[2]  P. Cavanagh,et al.  Clinical plantar pressure measurement in diabetes: rationale and methodology , 1994 .

[3]  Hylton B Menz,et al.  Evaluation of the accuracy of shoe fitting in older people using three-dimensional foot scanning , 2014, Journal of Foot and Ankle Research.

[4]  C Milgrom,et al.  A prospective study of the effect of the appropriateness of foot-shoe fit and training shoe type on the incidence of overuse injuries among infantry recruits. , 1992, Military medicine.

[5]  M. R. Hawes,et al.  Quantitative morphology of the human foot in a North American population. , 1994, Ergonomics.

[6]  L. Portney,et al.  Foundations of Clinical Research: Applications to Practice , 2015 .

[7]  A Wolfenden,et al.  The Futile Search for the Perfect Shoe Fit , 1988 .

[8]  Ravindra S. Goonetilleke,et al.  The Quality of Footwear Fit: What we know, don't know and should know , 2000 .

[9]  Masahiro Kurosaka,et al.  The effects of shoe fit on gait in community-dwelling older adults. , 2010, Gait & posture.

[10]  Pavel Mokrejs,et al.  Verification of toe allowance of children's footwear and its categorisation , 2015 .

[11]  Philip Roosen,et al.  Reliability and validity of the Infoot 3D foot digitizer for normal healthy adults , 2010 .

[12]  Juan Carlos González,et al.  A Footwear Fit Classification Model Based on Anthropometric Data , 2006 .

[13]  Stefan Grau,et al.  Improvement of fit of security shoes – evaluation of dynamic foot structure , 2017 .

[14]  Jessica A. Dobson,et al.  Effect of work boot type on work footwear habits, lower limb pain and perceptions of work boot fit and comfort in underground coal miners. , 2017, Applied ergonomics.

[15]  José Rubens Rebelatto,et al.  The relationship between wearing incorrectly sized shoes and foot dimensions, foot pain, and diabetes. , 2010, Journal of sport rehabilitation.

[16]  Alison F Bell,et al.  Are underground coal miners satisfied with their work boots? , 2018, Applied ergonomics.

[17]  Satoshi Hosoya,et al.  Effect of Improperly Sized Shoes on Gait , 2009 .

[18]  Ameersing Luximon,et al.  Foot landmarking for footwear customization , 2003, Ergonomics.

[19]  Georgios Grouios,et al.  Corns and calluses in athletes’ feet: a cause for concern , 2004 .

[20]  A continuation of the scientific review of the failings of modern shoes . PART 2 Footwear : The Primary Cause of Foot Disorders , .

[21]  B. Yates Merriman's assessment of the lower limb , 2009 .

[22]  Clemens Plank,et al.  Foot deformation during walking: differences between static and dynamic 3D foot morphology in developing feet , 2014, Ergonomics.

[23]  Channa P. Witana,et al.  Dimensional differences for evaluating the quality of footwear fit , 2004, Ergonomics.

[24]  B M Nigg,et al.  Influence of Foot, Leg and Shoe Characteristics on Subjective Comfort , 2000, Foot & ankle international.