Three-dimensional finite analysis of acetabular contact pressure and contact area during normal walking

Wang, Guangye; Huang, Wenjun; Song, Qi; Jin-feng, Liang

doi:10.1016/j.asjsur.2016.07.002

Cited by 26 publications

(19 citation statements)

References 28 publications

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“…Tests are performed using two different sliding conditions, as indicated in Table 1. Both continuously and intermittently loaded areas are present in a joint during a full gait cycle (Wang et al, 2017), and therefore stroke lengths of 3 mm and 7 mm are chosen to represent this physiological condition: part of the contact will be continuously loaded for a 3 mm stroke length and be migrating for a 7 mm stroke length. The graphic summary in the table illustrates these different contact configurations.…”

Section: Biotribometermentioning

confidence: 99%

Fluid load support does not explain tribological performance of PVA hydrogels

Porte

Cann

Masen

2019

Journal of the Mechanical Behavior of Biomedical Materials

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The application of hydrogels as articular cartilage (AC) repair or replacement materials is limited by poor tribological behaviour, as it does not match that of native AC. In cartilage, the pressurisation of the interstitial fluid is thought to be crucial for the low friction as the load is shared between the solid and liquid phase of the material. This fluid load support theory is also often applied to hydrogels. However, this theory has not been validated as no experimental evidence directly relates the pressurisation of the interstitial fluid to the frictional response of hydrogels. This lack of understanding about the governing tribological mechanisms in hydrogels limits their optimised design. Therefore, this paper aims to provide a direct measure for fluid load support in hydrogels under physiologically relevant sliding conditions. A photoelastic method was developed to simultaneously measure the load on the solid phase of the hydrogel and its friction coefficient and thus directly relate friction and fluid load support. The results showed a clear distinction in frictional behaviour between the different test conditions, but results from photoelastic images and stressrelaxation experiments indicated that fluid load support is an unlikely explanation for the frictional response of the hydrogels. A more appropriate explanation, we hypothesized, is a non-replenished lubricant mechanism. This work has important implications for the tribology of cartilage and hydrogels as it shows that the existing theories do not adequately describe the tribological behaviour of hydrogels. The developed insights can be used to optimise the tribological performance of hydrogels as articular cartilage implants.

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Section: Biotribometermentioning

confidence: 99%

Fluid load support does not explain tribological performance of PVA hydrogels

Porte

Cann

Masen

2019

Journal of the Mechanical Behavior of Biomedical Materials

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“…Following the CT(computed tomography) scan ( Figure 3a) before segmentation of the acetabular cup (AC) from the pelvis to obtain the two-dimensional (2D) CT images of AC, the 2D data and Mimics 16.0 software (Materialise Inc., Leuven, Belgium) is used to rebuild the three-dimensional (3D) model of the AC (see the procedure in [46]). After we constructed the 3D AC in Figure 4a, two different unit cells size were taken for generating AC cellular implant used with a vintiles lattice topology.…”

Section: Design Of Ti-6al-4v Alloy Implant (Ac) With Vintiles Structurementioning

confidence: 99%

Design, Optimization, and Evaluation of Additively Manufactured Vintiles Cellular Structure for Acetabular Cup Implant

et al. 2019

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Cellular materials with very highly regulated micro-architectures are promising applicant materials for orthopedic medical uses while requiring implants or substituting for bone due to their ability to promote increased cell proliferation and osseointegration. This study focuses on the design of an acetabular cup (AC) cellular implant which was built using a vintiles cellular structure with an internal porosity of 56–87.9% and internal pore dimensions in the range of 600–1200 μm. The AC implant was then optimized for improving mechanical performance to reduce stress shielding by adjusting the porosity to produce stiffness (elastic modulus) to match with the bone, and allowing for bone cell ingrowth. The optimized and non-optimized AC cellular implant was fabricated using the SLM additive manufacturing process. Simulation (finite element analysis, FEA) was carried out and all cellular implants are finally tested under static loading conditions. The result showed that on the finite element model of an optimized implant, cellular has shown 69% higher stiffness than non-optimized. It has been confirmed by experimental work shown that the optimized cellular implant has a 71% higher ultimate compressive strength than the non-optimized counterpart. Finally, we developed an AC implant with mechanical performance adequately close to that of human bone.

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“…The distal femur was completely fixed, while the acetabulum and the articular cartilage were partially fixed, with movement limited to vertical movement in the coronal plane. The contact force of the hip joint under these conditions was approximately 3 times that of the mass of the body i.e., for a body mass of 70 kg, the size of load forced on the acetabulum was 2100 N. 13 The load direction was located in the OXZ plane through the center of the femoral head, and the CE angle was set according to the CE angle of the hip joint model. The finite element model of the total hip was established in this study in order to verify the mathematical model for contact stress in the articular surface of the hip joint.…”

Section: Methodsmentioning

confidence: 99%

A novel modelling and simulation method of hip joint surface contact stress

Wang

et al. 2016

Bioengineered

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Understanding the hip joint surface contact stress distribution characteristics is helpful to determine hip joint biomechanical features and abnormal pathological behavior. Firstly, a 3-dimensional static hip joint biomechanical model is built using analytical method of model in order to study biomechanical properties including bearing area, stress distribution and the peak value of the contact stress of the femoral head, which reveals the relationship between the biomechanical properties and its geometric parameters. Secondly, based on the finite element analysis of the hip joint model, the contact stress distribution on the surface of femoral head is acquired under the condition of the different joint force and the acetabulum coverage rate. Finally, according to the evaluation of the femoral head surface stress and contact stress peak under different load distribution, accuracy and universality of the biomechanical model is verified.

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Three-dimensional finite analysis of acetabular contact pressure and contact area during normal walking

Abstract: The zones of increased contact pressure and the distributions of acetabular contact areas had important significance towards clinical researches, and could indicate the inductive factors of acetabular osteoarthritis.

Cited by 26 publications

References 28 publications

Fluid load support does not explain tribological performance of PVA hydrogels

Fluid load support does not explain tribological performance of PVA hydrogels

Design, Optimization, and Evaluation of Additively Manufactured Vintiles Cellular Structure for Acetabular Cup Implant

A novel modelling and simulation method of hip joint surface contact stress

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