Shear Stress-Normal Stress Ratio Decides Forming Callus

NewsBot · Jan 5, 2017

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Shear Stress-Normal Stress (Pressure) Ratio Decides Forming Callus in Patients with Diabetic Neuropathy
Ayumi Amemiya et al
Journal of Diabetes Research; Volume 2016 (2016), Article ID 3157123, 10 pages

Aim. Callus is a risk factor, leading to severe diabetic foot ulcer; thus, prevention of callus formation is important. However, normal stress (pressure) and shear stress associated with callus have not been clarified. Additionally, as new valuables, a shear stress-normal stress (pressure) ratio (SPR) was examined. The purpose was to clarify the external force associated with callus formation in patients with diabetic neuropathy.
Methods. The external force of the 1st, 2nd, and 5th metatarsal head (MTH) as callus predilection regions was measured. The SPR was calculated by dividing shear stress by normal stress (pressure), concretely, peak values (SPR-p) and time integral values (SPR-i). The optimal cut-off point was determined.
Results. Callus formation region of the 1st and 2nd MTH had high SPR-i rather than noncallus formation region. The cut-off value of the 1st MTH was 0.60 and the 2nd MTH was 0.50. For the 5th MTH, variables pertaining to the external forces could not be determined to be indicators of callus formation because of low accuracy.
Conclusions. The callus formation cut-off values of the 1st and 2nd MTH were clarified. In the future, it will be necessary to confirm the effect of using appropriate footwear and gait training on lowering SPR-i.
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Admin2 · Jan 5, 2017

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NewsBot · Oct 5, 2018

Examination of the Effect of Suitable Size of Shoes
under the Second Metatarsal Head and Width
of Shoes under the Fifth Metatarsal Head for
the Prevention of Callus Formation in Healthy
Young Women
Ryutaro Kase et al
Sensors 2018, 18, 3269; doi:10.3390/s18103269 : 28 September 2018

Excessive pressure and shear stress while walking cause a risk of callus formation,
which eventually causes foot ulcers in patients with diabetes mellitus. Callus under the second
metatarsal head (MTH) has been associated with increased shear stress/pressure ratios (SPR). Callus
under the fifth MTH has been associated with increased peak shear stress (PSS). The purpose of this
study is to examine whether the effect of the suitable size and width of shoes prevents diabetic foot
ulcers under the second and fifth MTH. We measured the pressure and shear stress by testing three
kinds of sizes and two types of width of shoes. Significant difference was not observed in the SPR
under the second MTH among different sizes of shoes. However, the pressure and shear stress were
significantly lower when putting on shoes of fit size compared with larger sizes. The PSS under the
fifth MTH was significantly smaller when putting on shoes of fit width compared with those of narrow
width. Wearing shoes of fit size and width has the potential to prevent callus formation by reducing the
pressure and shear stress constituting SPR under the second MTH and PSS under the fifth MTH.
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Shear Stress-Normal Stress Ratio Decides Forming Callus

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Shear Stress-Normal Stress Ratio Decides Forming Callus

NewsBot The Admin that posts the news.

Admin2 Administrator Staff Member

NewsBot The Admin that posts the news.

The role of hemodynamic shear stress in healing chronic wounds

Using temperature to predict areas of high shear stress in the diabetic foot

Shear stress reduction and heel ulcers

Shear stress and diabetic foot ulcers

Effects of shear reduction shoes on joint loading and ground reaction force

Optimal Shear Cushion Stiffness at Different Gait Speeds

Shear wave elastography to assess plantar fasciitis

Share This Page

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