Studying Maximum Plantar Stress per Insole Design Using Foot CT-Scan Images of Hyperelastic Soft Tissues

Sarikhani, Ali; Motalebizadeh, Abbas; Asiaei, Sasan; Azad, Babak Kamali Doost

doi:10.1155/2016/8985690

Cited by 16 publications

(17 citation statements)

References 16 publications

(22 reference statements)

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“…Previous study showed that the custom-molded insole reduced maximum stress 40% more than the flat surface insole. In the increase of insole thickness, stress distribution becomes more uniform and maximum stress value decreases up to 10% [ 6 ].…”

Section: Discussionmentioning

confidence: 99%

“…Previous study showed that the custom-molded insole could reduce stress compared with the flat insole. The thickness, heel's height, and materials of proper insole could minimize the peak plantar stress and achieve uniform stress distribution [ 6 ]. The material and arch height of insole in the sport shoes have a significant effect on biomechanical characteristics of the foot [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Arch Height and Material Hardness of Personalized Insole on Correction and Tissues of Flatfoot

Guo

2017

Journal of Healthcare Engineering

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Flat foot is one of the common deformities in the youth population, seriously affecting the weight supporting and daily exercising. However, there is lacking of quantitative data relative to material selection and shape design of the personalized orthopedic insole. This study was to evaluate the biomechanical effects of material hardness and support height of personalized orthopedic insole on foot tissues, by in vivo experiment and finite element modeling. The correction of arch height increased with material hardness and support height. The peak plantar pressure increased with the material hardness, and these values by wearing insoles of 40° were apparently higher than the bare feet condition. Harder insole material results in higher stress in the joint and ligament stress than softer material. In the calcaneocuboid joint, the stress increased with the arch height of insoles. The material hardness did not apparently affect the stress in the ankle joints, but the support heights of insole did. In general, insole material and support design are positively affecting the correction of orthopedic insole, but negatively resulting in unreasonable stress on the stress in the joint and ligaments. There should be an integration of improving correction and reducing stress in foot tissues.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of Arch Height and Material Hardness of Personalized Insole on Correction and Tissues of Flatfoot

Guo

2017

Journal of Healthcare Engineering

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“…al (2012) in their FEM analysis of insoles. The peak stress of 1.17 MPa is significantly higher than the values quoted by Cheung & Zhang (2006) and Sarikhani et al (2016) who calculated maximum stresses of just 156 kPa and 100 kPa respectively for similar analyses (see section 2.1.1 for further details). However, the simulation conducted by this study examined a worst-case scenario of a 90 kg person running, compared to the 70 kg static cases from the earlier studies.…”

Section: Calculation Of Forces On Orthoticcontrasting

confidence: 52%

“…Cheung & Zhang (2006) found that a 70 kg person in a standing position generates a peak stress of around 156 kPa in the forefoot and heel regions. By comparison a similar study also using a 70 kg stationary load case produced peak stresses of just 100 kPa (Sarikhani, et al, 2016). As such the literature is unable to set out a definitive loading case which the orthotics should withstand.…”

Section: Design Considerationsmentioning

confidence: 95%

UQ eSpace

Fitzpatrick¹

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A local podiatry company has recently purchased a state-of-the-art 3D printer for manufacturing orthotic insoles. The HP Jet Fusion will replace the existing manufacturing techniques which are time consuming and labour intensive. However, due to the innovative printing process, the long-term durability of the material produced by the device is currently unknown. Fatigue is a significant concern in the design of orthotics due to the constant cyclic loading experienced during walking or running. As such, this thesis set out to determine the suitability of the Jet Fusion printer for producing orthotics from a fatigue perspective. Following an extensive literature review, flexural fatigue testing was conducted using the ASTM D7774 standard. The tests compared the Jet Fusion samples to the performance of specimens produced through fused deposition modelling (FDM). The results indicated that the Jet Fusion and FDM samples had fatigue limits of 22.4 MPa and 7.7 MPa respectively. The number of cycles to failure and flexural stress levels were found to be logarithmically correlated for both materials. With the maximum stress experienced by orthotic insoles being in the order of 1 MPa, it was found that both materials had sufficient properties to avoid failure due to fatigue. As such, it has been concluded that from a fatigue perspective, the HP Jet Fusion Printer is suitable for use in manufacturing orthotic insoles. ii ACKNOWLEDGEMENTS I would firstly like to thank my supervisor Dr Gui Wang for taking me on at such short notice. His expertise and guidance throughout this project have been of tremendous help and I am sincerely thankful for his assistance. I would also like to acknowledge: Daniel Graham for his assistance with setting up the testing machines; the UQ Workshop for producing the mounting rig; and iOrthotics for the inspiration for the topic and provision of testing samples. Finally, my heartfelt thanks go to my wonderful family and friends for their endless support and encouragement.

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“…26 Interestingly, the authors also verified that the increase in thickness above 1 cm was ineffective at improving plantar pressure distribution, emphasizing that insoles thicknesses between 0.5 and 0.75 cm would be more favorable for patients with plantar fasciopathy. 26…”

Section: Discussionmentioning

confidence: 88%

Effects of insoles adapted in flip-flop sandals in people with plantar fasciopathy: a randomized, double-blind clinical, controlled study

et al. 2019

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Objective: To evaluate the effects of insoles adapted into flip-flop sandals on pain and function in individuals with plantar fasciopathy (PF). Design: Randomized, double-blind controlled study. Setting: Physiotherapy clinic of the Faculty of Health Sciences of Trairi, Federal University of Rio Grande do Norte, Santa Cruz, Brazil. Subjects: Sixty-six patients of both genders with PF were randomized into two groups: sandal insole group (SI; n = 34), which received a pair of custom flip-flop sandals with insoles covered with smooth synthetic leather; and plain sandal group (PS; n = 32), which received an identical pair of flip-flop sandals, but without the insoles. Interventions: Patients were instructed to wear the flip-flops for 12 weeks for at least 4 hours/day. Main measures: Pain (visual analogue scale—VAS) in the morning and at the end of the day were considered primary outcomes. Function (Foot Function Index—FFI and Foot and Ankle Ability Measure—FAAM) and functional capacity (6-minute walk test—6MWT) were considered secondary outcomes. The outcomes were evaluated at baseline and immediately after the intervention by a blind assessor. Results: Between-group differences were observed in terms of morning pain (mean difference (MD) = –1.82 cm; 95% confidence interval (CI) = –3.3 to −0.3; P = 0.016) and function (MD = –0.10; 95% CI = –0.19 to −0.01; P = 0.023) after the interventions with the SI group showing superior improvements in comparison to the PS group. Conclusion: The use of insoles adapted in flip-flop sandals for 12 weeks was effective at improving pain and function in individuals with PF. Level of evidence: 1b.

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Studying Maximum Plantar Stress per Insole Design Using Foot CT-Scan Images of Hyperelastic Soft Tissues

Cited by 16 publications

References 16 publications

The Effect of Arch Height and Material Hardness of Personalized Insole on Correction and Tissues of Flatfoot

The Effect of Arch Height and Material Hardness of Personalized Insole on Correction and Tissues of Flatfoot

UQ eSpace

Effects of insoles adapted in flip-flop sandals in people with plantar fasciopathy: a randomized, double-blind clinical, controlled study

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