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Isvilanonda V, Li EY, Williams ED, Cavanagh PR, Haynor DR, Chu B, Ledoux WR. Subject-specific material properties of the heel pad: An inverse finite element analysis. J Biomech 2024; 165:112016. [PMID: 38422775 DOI: 10.1016/j.jbiomech.2024.112016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 01/01/2024] [Accepted: 02/19/2024] [Indexed: 03/02/2024]
Abstract
Individuals with diabetes are at a higher risk of developing foot ulcers. To better understand internal soft tissue loading and potential treatment options, subject-specific finite element (FE) foot models have been used. However, existing models typically lack subject-specific soft tissue material properties and only utilize subject-specific anatomy. Therefore, this study determined subject-specific hindfoot soft tissue material properties from one non-diabetic and one diabetic subject using inverse FE analysis. Each subject underwent cyclic MRI experiments to simulate physiological gait and to obtain compressive force and three-dimensional soft tissue imaging data at 16 phases along the loading-unloading cycles. The FE models consisted of rigid bones and nearly-incompressible first-order Ogden hyperelastic skin, fat, and muscle (resulting in six independent material parameters). Then, calcaneus and loading platen kinematics were computed from imaging data and prescribed to the FE model. Two analyses were performed for each subject. First, the skin, fat, and muscle layers were lumped into a single generic soft tissue material and optimized to the platen force. Second, the skin, fat, and muscle material properties were individually determined by simultaneously optimizing for platen force, muscle vertical displacement, and skin mediolateral bulging. Our results indicated that compared to the individual without diabetes, the individual with diabetes had stiffer generic soft tissue behavior at high strain and that the only substantially stiffer multi-material layer was fat tissue. Thus, we suggest that this protocol serves as a guideline for exploring differences in non-diabetic and diabetic soft tissue material properties in a larger population.
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Affiliation(s)
- Vara Isvilanonda
- Center for Limb Loss and MoBility (CLiMB), Department of Veterans Affairs, Seattle, WA, USA; Departments of Mechanical Engineering, University of Washington, Seattle, WA, USA
| | - Ellen Y Li
- Center for Limb Loss and MoBility (CLiMB), Department of Veterans Affairs, Seattle, WA, USA; Departments of Mechanical Engineering, University of Washington, Seattle, WA, USA
| | - Evan D Williams
- Center for Limb Loss and MoBility (CLiMB), Department of Veterans Affairs, Seattle, WA, USA; Departments of Mechanical Engineering, University of Washington, Seattle, WA, USA
| | - Peter R Cavanagh
- Departments of Mechanical Engineering, University of Washington, Seattle, WA, USA; Orthopaedics & Sports Medicine, University of Washington, Seattle, WA, USA
| | | | - Baocheng Chu
- Radiology, University of Washington, Seattle, WA, USA
| | - William R Ledoux
- Center for Limb Loss and MoBility (CLiMB), Department of Veterans Affairs, Seattle, WA, USA; Departments of Mechanical Engineering, University of Washington, Seattle, WA, USA; Orthopaedics & Sports Medicine, University of Washington, Seattle, WA, USA.
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MR-compatible loading device for assessment of heel pad internal tissue displacements under shearing load. Med Eng Phys 2021; 98:125-132. [PMID: 34848031 DOI: 10.1016/j.medengphy.2021.11.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 10/25/2021] [Accepted: 11/05/2021] [Indexed: 11/24/2022]
Abstract
In the last decade, the role of shearing loads has been increasingly suspected to play a determinant impact in the formation of deep pressure ulcers. In vivo observations of such deformations are complex to obtain. Previous studies only provide global measurements of such deformations without getting the quantitative values of the loads that generate these deformations. To study the role that shearing loads have in the etiology of heel pressure ulcers, an MR-compatible device for the application of shearing and normal loads was designed. Magnetic resonance imaging is a key feature that allows to monitor deformations of soft tissues after loading in a non-invasive way. Measuring applied forces in an MR-environment is challenging due to the impossibility to use magnetic materials. In our device, forces are applied through the compression of springs made of polylactide. Shearing and normal loads were applied on the plantar skin of the human heel through a flat plate while acquiring MR images. The device materials did not introduce any imaging artifact and allowed for high quality MR deformation measurements of the internal components of the heel. The obtained subject-specific results are an original data set that can be used in validations for Finite Element analysis and therefore contribute to a better understanding of the factors involved in pressure ulcer development.
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Scarton A, Guiotto A, Malaquias T, Spolaor F, Sinigaglia G, Cobelli C, Jonkers I, Sawacha Z. A methodological framework for detecting ulcers' risk in diabetic foot subjects by combining gait analysis, a new musculoskeletal foot model and a foot finite element model. Gait Posture 2018; 60:279-285. [PMID: 28965863 DOI: 10.1016/j.gaitpost.2017.08.036] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 08/30/2017] [Indexed: 02/02/2023]
Abstract
Diabetic foot is one of the most debilitating complications of diabetes and may lead to plantar ulcers. In the last decade, gait analysis, musculoskeletal modelling (MSM) and finite element modelling (FEM) have shown their ability to contribute to diabetic foot prevention and suggested that the origin of the plantar ulcers is in deeper tissue layers rather than on the plantar surface. Hence the aim of the current work is to develop a methodology that improves FEM-derived foot internal stresses prediction, for diabetic foot prevention applications. A 3D foot FEM was combined with MSM derived force to predict the sites of excessive internal stresses on the foot. In vivo gait analysis data, and an MRI scan of a foot from a healthy subject were acquired and used to develop a six degrees of freedom (6 DOF) foot MSM and a 3D subject-specific foot FEM. Ankle kinematics were applied as boundary conditions to the FEM together with: 1. only Ground Reaction Forces (GRFs); 2. OpenSim derived extrinsic muscles forces estimated with a standard OpenSim MSM; 3. extrinsic muscle forces derived through the (6 DOF) foot MSM; 4. intrinsic and extrinsic muscles forces derived through the 6 DOF foot MSM. For model validation purposes, simulated peak pressures were extracted and compared with those measured experimentally. The importance of foot muscles in controlling plantar pressure distribution and internal stresses is confirmed by the improved accuracy in the estimation of the peak pressures obtained with the inclusion of intrinsic and extrinsic muscle forces.
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Affiliation(s)
- Alessandra Scarton
- Department of Information Engineering, University of Padova, Via Gradenigo 6b, Padova, 35131, Italy.
| | - Annamaria Guiotto
- Department of Information Engineering, University of Padova, Via Gradenigo 6b, Padova, 35131, Italy.
| | - Tiago Malaquias
- Department of Mechanical Engineering, Biomechanics Section, Celestijnenlaan 300-box 2419, 3001 Leuven, Belgium.
| | - Fabiola Spolaor
- Department of Information Engineering, University of Padova, Via Gradenigo 6b, Padova, 35131, Italy.
| | - Giacomo Sinigaglia
- Department of Information Engineering, University of Padova, Via Gradenigo 6b, Padova, 35131, Italy.
| | - Claudio Cobelli
- Department of Information Engineering, University of Padova, Via Gradenigo 6b, Padova, 35131, Italy.
| | - Ilse Jonkers
- Department of Kinesiology, Human Movement Biomechanics Research Group, KU Leuven, Tervuursevest 101 - Box 1501, 3001, Leuven, Belgium.
| | - Zimi Sawacha
- Department of Information Engineering, University of Padova, Via Gradenigo 6b, Padova, 35131, Italy.
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Williams ED, Stebbins MJ, Cavanagh PR, Haynor DR, Chu B, Fassbind MJ, Isvilanonda V, Ledoux WR. A preliminary study of patient-specific mechanical properties of diabetic and healthy plantar soft tissue from gated magnetic resonance imaging. Proc Inst Mech Eng H 2017; 231:625-633. [PMID: 28661227 DOI: 10.1177/0954411917695849] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Foot loading rate, load magnitude, and the presence of diseases such as diabetes can all affect the mechanical properties of the plantar soft tissues of the human foot. The hydraulic plantar soft tissue reducer instrument was designed to gain insight into which variables are the most significant in determining these properties. It was used with gated magnetic resonance imaging to capture three-dimensional images of feet under dynamic loading conditions. Custom electronics controlled by LabVIEW software simultaneously recorded system pressure, which was then translated to applied force values based on calibration curves. Data were collected for two subjects, one without diabetes (Subject A) and one with diabetes (Subject B). For a 0.2-Hz loading rate, and strains 0.16, 0.18, 0.20, and 0.22, Subject A's average tangential heel pad stiffness was 10 N/mm and Subject B's was 24 N/mm. Maximum test loads were approximately 200 N. Loading rate and load magnitude limitations (both were lower than physiologic values) will continue to be addressed in the next version of the instrument. However, the current hydraulic plantar soft tissue reducer did produce a data set for healthy versus diabetic tissue stiffness that agrees with previous trends. These data are also being used to improve finite element analysis models of the foot as part of a related project.
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Affiliation(s)
- Evan D Williams
- 1 RR&D Center of Excellence for Limb Loss Prevention and Prosthetic Engineering, VA Puget Sound Health Care System, Seattle, WA, USA.,2 Department of Mechanical Engineering, University of Washington, Seattle, WA, USA
| | - Michael J Stebbins
- 1 RR&D Center of Excellence for Limb Loss Prevention and Prosthetic Engineering, VA Puget Sound Health Care System, Seattle, WA, USA.,2 Department of Mechanical Engineering, University of Washington, Seattle, WA, USA
| | - Peter R Cavanagh
- 2 Department of Mechanical Engineering, University of Washington, Seattle, WA, USA.,3 Department of Orthopaedics and Sports Medicine, University of Washington, Seattle, WA, USA
| | - David R Haynor
- 4 Department of Radiology, University of Washington, Seattle, WA, USA
| | - Baocheng Chu
- 4 Department of Radiology, University of Washington, Seattle, WA, USA
| | - Michael J Fassbind
- 1 RR&D Center of Excellence for Limb Loss Prevention and Prosthetic Engineering, VA Puget Sound Health Care System, Seattle, WA, USA
| | - Vara Isvilanonda
- 1 RR&D Center of Excellence for Limb Loss Prevention and Prosthetic Engineering, VA Puget Sound Health Care System, Seattle, WA, USA.,2 Department of Mechanical Engineering, University of Washington, Seattle, WA, USA
| | - William R Ledoux
- 1 RR&D Center of Excellence for Limb Loss Prevention and Prosthetic Engineering, VA Puget Sound Health Care System, Seattle, WA, USA.,2 Department of Mechanical Engineering, University of Washington, Seattle, WA, USA.,3 Department of Orthopaedics and Sports Medicine, University of Washington, Seattle, WA, USA
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Isvilanonda V, Iaquinto JM, Pai S, Mackenzie-Helnwein P, Ledoux WR. Hyperelastic compressive mechanical properties of the subcalcaneal soft tissue: An inverse finite element analysis. J Biomech 2016; 49:1186-1191. [DOI: 10.1016/j.jbiomech.2016.03.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 02/03/2016] [Accepted: 03/02/2016] [Indexed: 11/26/2022]
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