A parametric analysis of fixation post shape in tibial knee prostheses

Au, Anthony G.; Liggins, A.B.; Raso, V.J.; Amirfazli, Alidad

doi:10.1016/j.medengphy.2004.09.010

Cited by 38 publications

(33 citation statements)

References 37 publications

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“…The modulus of the cortical bone has been used by Nyman et al [9] and is within the range of moduli cited and used by other authors. The value of the cancellous modulus used is within the range of values (389-1132 MPa) cited by Au et al [10] for cancellous bone and obtained experimentally. The value of the cortical bone thickness (2 mm) was based on advice from the senior clinical author and is consistent with an image of a tibia sectioned for a TKA.…”

Section: Methodssupporting

confidence: 60%

“…Although a direct comparison was not made between predicted and measured bone strains in this study such a comparison has been undertaken by Completo et al [12]. The mesh used in the current study, employing quadratic elements, is more accurate than that used by Completo et al [10] who only used linear elements. This provides further validation of the mesh used in the current study.…”

Section: Methodsmentioning

confidence: 85%

“…The effect of the gastrocnemius however is represented in the applied joint reaction force. Traditionally the loads applied to the knee to represent level gait in FE modelling have been between 2.5 to 3 times body weight [2,10,12] These data have been based on developments of the knee biomechanics developed by Morrison [13]. More recently, somewhat lower levels of loading (2.2 times body weight) have been actually measured in-vivo [14] and it seemed more appropriate to use these loads.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Finite element assessment of block-augmented total knee arthroplasty

Frehill

Crocombe

Agarwal

et al. 2014

Computer Methods in Biomechanics and Biomedical Engineering

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Abstract:Loosening and migration of tibial prostheses have been identified as causes of early total knee replacement (TKR) failure. The problem is made more complex when defects occur in the proximal tibia compromising fixation and alignment. Clinical studies using metal augments have shown these to be an alternative to other means of defect treatment. Finite element (FE) analysis can be used to identify regions that may be prone to loosening and migration. In the current work 3D FE models of TKR uncontained type-2 defects treated with block augments have been constructed and analysed. It has been shown that a metal augment is the most suitable. The use of bone cement (PMMA) to fill proximal defects is not considered suitable as stresses carried by the cement block exceed those of the fatigue limit of bone cement. It has been shown that the stresses in the proximal cancellous bone of block augmented models are significantly below levels likely to cause damage due to overloading.Further, the use of stem extensions have been shown to reduce the cancellous bone stresses in the proximal region thus increasing the likelihood of bone resorption. Given this it is recommended that stem extensions are not require unless necessary to mitigate some other problem.

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Section: Methodssupporting

confidence: 60%

Section: Methodsmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

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Finite element assessment of block-augmented total knee arthroplasty

Frehill

Crocombe

Agarwal

et al. 2014

Computer Methods in Biomechanics and Biomedical Engineering

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“…Stresses sufficiently high to cause inelastic deformation of trabecular bone can also be generated during the press-fit implantation of acetabular cups [5] and femoral stems [6] in total hip arthroplasty. Despite this, biomechanical studies of total joint arthroplasty largely focus on the comparison of the pre-implanted intact bone with the postimplanted bone [7][8][9][10][11][12], neglecting the effect of the inelastic deformation of the trabecular bone during surgical implantation. Previous finite element studies investigating press-fit implantation of total arthroplasty stems have used linear elastic material models [13].…”

Section: Introductionmentioning

confidence: 99%

An investigation of the inelastic behaviour of trabecular bone during the press-fit implantation of a tibial component in total knee arthroplasty

Kelly

Cawley

Shannon

et al. 2013

Medical Engineering & Physics

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“…The elastic modulus values of titanium, CoCr, and bone cement were set to 110, 214, and 1.95 GPa, respectively. 18,19 All materials, including bone, were assumed to be linearly elastic, considered a valid assumption for models employing quasi-static loads and employed by the majority of previously published non-dynamic bone models (e.g., Au et al 20 ). Figure 2 shows a representative bone assembled with an SBI implant.…”

Section: Model Developmentmentioning

confidence: 99%

Bone stresses before and after insertion of two commercially available distal ulnar implants using finite element analysis

Austman

King

Dunning

2011

Journal Orthopaedic Research

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Distal ulnar arthroplasty is becoming a popular treatment option for disorders of the distal radioulnar joint; however, few studies have investigated how load transfer in the ulna is altered after insertion of an implant. The purpose of our study was to compare bone stresses before and after insertion of two commercially available cemented distal ulnar implants: an implant with a titanium stem and an implant with a cobalt chrome stem. Appropriately sized implants of both types were inserted into eight previously validated subject-specific finite element models, which were created by using information derived from computed tomography scans. The von Mises stresses were compared at eight different regions pre-and post-implantation. The bone stresses with the titanium stem were consistently closer to the pre-implantation stresses than with the cobalt chrome stem. For the loading situation and parameters investigated, results of these models show that insertion of the E-Centrix 1 ulnar Head may result in less stress shielding than the SBI uHead TM stem. Future studies are required to investigate other implant design parameters and loading conditions that may affect the predicted amount of stress shielding. ß

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A parametric analysis of fixation post shape in tibial knee prostheses

Cited by 38 publications

References 37 publications

Finite element assessment of block-augmented total knee arthroplasty

Finite element assessment of block-augmented total knee arthroplasty

An investigation of the inelastic behaviour of trabecular bone during the press-fit implantation of a tibial component in total knee arthroplasty

Bone stresses before and after insertion of two commercially available distal ulnar implants using finite element analysis

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