The Experts below are selected from a list of 58200 Experts worldwide ranked by ideXlab platform
L'hocine Yahia - One of the best experts on this subject based on the ideXlab platform.
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Bone remodeling in a new biomimetic polymer composite hip stem
Journal of Biomedical Materials Research Part A, 2010Co-Authors: Habiba Bougherara, Martin N Bureau, L'hocine YahiaAbstract:Adaptive Bone remodeling is an important factor that leads to Bone resorption in the surrounding Femoral Bone and implant loosening. Taking into account this factor in the design of hip implants is of clinical importance, because it allows the prediction of the Bone-density redistribution and enables the monitoring of Bone adaptation after prosthetic implantation. In this article, adaptive Bone remodeling around a new biomimetic polymer-composite-based (CF/PA12) hip prosthesis is investigated to evaluate the amount of stress shielding and Bone resorption. The design concept of this new prosthesis is based on a hollow substructure made of hydroxyapatite-coated, continuous carbon fiber (CF)-reinforced polyamide 12 (PA12) composite with an internal soft polymer-based core. Strain energy density theory coupled with 3D Finite Element models is used to predict Bone density redistributions in the Femoral Bone before and after total hip replacement (THR) using both polymer-composite and titanium (Ti) stems. The result of numerical simulations of Bone remodeling revealed that the CF/PA12 composite stem generates a better Bone density pattern compared with the Ti-based stem, indicating the effectiveness of the composite stem to reduce Bone resorption caused by stress-shielding phenomenon. This may result in an extended lifetime of THR.
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design of a biomimetic polymer composite hip prosthesis
Journal of Biomedical Materials Research Part A, 2007Co-Authors: Habiba Bougherara, Martin N Bureau, Melissa Campbell, Aurelian Vadean, L'hocine YahiaAbstract:A new biomimetic composite hip prosthesis (stem) was designed to obtain properties similar to those of the contiguous Bone, in particular stiffness, to allow normal loading of the surrounding Femoral Bone. This normal loading would reduce excessive stress shielding, known to result in Bone loss, and micromotions at the Bone-implant interface, leading to aseptic prosthetic loosening. The design proposed is based on a hollow substructure made of hydroxyapatite-coated, continuous carbon fiber (CF) reinforced polyamide 12 (PA12) composite with an internal soft polymer-based core. Different composite configurations were studied to match the properties of host tissue. Nonlinear three-dimensional analysis of the hip prosthesis was carried out using a three-dimensional finite element Bone model based on the composite femur. The performance of composite-based hip and titanium alloy-based (Ti-6Al-4V) stems embedded into Femoral Bone was compared. The effect of core stiffness and ply configuration was also analyzed. Results show that stresses in composite stem are lower than those in Ti stem, and that the Femoral Bone implanted with composite structure sustains more load than the one implanted with Ti stem. Micromotions in the composite stem are significantly smaller than those in Ti stem over the entire Bone-implant surface because of the favorable interfacial stress distribution.
Habiba Bougherara - One of the best experts on this subject based on the ideXlab platform.
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Bone remodeling in a new biomimetic polymer composite hip stem
Journal of Biomedical Materials Research Part A, 2010Co-Authors: Habiba Bougherara, Martin N Bureau, L'hocine YahiaAbstract:Adaptive Bone remodeling is an important factor that leads to Bone resorption in the surrounding Femoral Bone and implant loosening. Taking into account this factor in the design of hip implants is of clinical importance, because it allows the prediction of the Bone-density redistribution and enables the monitoring of Bone adaptation after prosthetic implantation. In this article, adaptive Bone remodeling around a new biomimetic polymer-composite-based (CF/PA12) hip prosthesis is investigated to evaluate the amount of stress shielding and Bone resorption. The design concept of this new prosthesis is based on a hollow substructure made of hydroxyapatite-coated, continuous carbon fiber (CF)-reinforced polyamide 12 (PA12) composite with an internal soft polymer-based core. Strain energy density theory coupled with 3D Finite Element models is used to predict Bone density redistributions in the Femoral Bone before and after total hip replacement (THR) using both polymer-composite and titanium (Ti) stems. The result of numerical simulations of Bone remodeling revealed that the CF/PA12 composite stem generates a better Bone density pattern compared with the Ti-based stem, indicating the effectiveness of the composite stem to reduce Bone resorption caused by stress-shielding phenomenon. This may result in an extended lifetime of THR.
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design of a biomimetic polymer composite hip prosthesis
Journal of Biomedical Materials Research Part A, 2007Co-Authors: Habiba Bougherara, Martin N Bureau, Melissa Campbell, Aurelian Vadean, L'hocine YahiaAbstract:A new biomimetic composite hip prosthesis (stem) was designed to obtain properties similar to those of the contiguous Bone, in particular stiffness, to allow normal loading of the surrounding Femoral Bone. This normal loading would reduce excessive stress shielding, known to result in Bone loss, and micromotions at the Bone-implant interface, leading to aseptic prosthetic loosening. The design proposed is based on a hollow substructure made of hydroxyapatite-coated, continuous carbon fiber (CF) reinforced polyamide 12 (PA12) composite with an internal soft polymer-based core. Different composite configurations were studied to match the properties of host tissue. Nonlinear three-dimensional analysis of the hip prosthesis was carried out using a three-dimensional finite element Bone model based on the composite femur. The performance of composite-based hip and titanium alloy-based (Ti-6Al-4V) stems embedded into Femoral Bone was compared. The effect of core stiffness and ply configuration was also analyzed. Results show that stresses in composite stem are lower than those in Ti stem, and that the Femoral Bone implanted with composite structure sustains more load than the one implanted with Ti stem. Micromotions in the composite stem are significantly smaller than those in Ti stem over the entire Bone-implant surface because of the favorable interfacial stress distribution.
Matthew P Abdel - One of the best experts on this subject based on the ideXlab platform.
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proximal Femoral replacement in contemporary revision total hip arthroplasty for severe Femoral Bone loss
Journal of Bone and Joint Surgery-british Volume, 2017Co-Authors: Anthony Viste, Kevin I Perry, Michael J Taunton, Arlen D Hanssen, Matthew P AbdelAbstract:AimsLoss or absence of proximal Femoral Bone in revision total hip arthroplasty (THA) remains a significant challenge. While the main indication for the use of proximal Femoral replacements (PFRs) ...
Martin N Bureau - One of the best experts on this subject based on the ideXlab platform.
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Bone remodeling in a new biomimetic polymer composite hip stem
Journal of Biomedical Materials Research Part A, 2010Co-Authors: Habiba Bougherara, Martin N Bureau, L'hocine YahiaAbstract:Adaptive Bone remodeling is an important factor that leads to Bone resorption in the surrounding Femoral Bone and implant loosening. Taking into account this factor in the design of hip implants is of clinical importance, because it allows the prediction of the Bone-density redistribution and enables the monitoring of Bone adaptation after prosthetic implantation. In this article, adaptive Bone remodeling around a new biomimetic polymer-composite-based (CF/PA12) hip prosthesis is investigated to evaluate the amount of stress shielding and Bone resorption. The design concept of this new prosthesis is based on a hollow substructure made of hydroxyapatite-coated, continuous carbon fiber (CF)-reinforced polyamide 12 (PA12) composite with an internal soft polymer-based core. Strain energy density theory coupled with 3D Finite Element models is used to predict Bone density redistributions in the Femoral Bone before and after total hip replacement (THR) using both polymer-composite and titanium (Ti) stems. The result of numerical simulations of Bone remodeling revealed that the CF/PA12 composite stem generates a better Bone density pattern compared with the Ti-based stem, indicating the effectiveness of the composite stem to reduce Bone resorption caused by stress-shielding phenomenon. This may result in an extended lifetime of THR.
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design of a biomimetic polymer composite hip prosthesis
Journal of Biomedical Materials Research Part A, 2007Co-Authors: Habiba Bougherara, Martin N Bureau, Melissa Campbell, Aurelian Vadean, L'hocine YahiaAbstract:A new biomimetic composite hip prosthesis (stem) was designed to obtain properties similar to those of the contiguous Bone, in particular stiffness, to allow normal loading of the surrounding Femoral Bone. This normal loading would reduce excessive stress shielding, known to result in Bone loss, and micromotions at the Bone-implant interface, leading to aseptic prosthetic loosening. The design proposed is based on a hollow substructure made of hydroxyapatite-coated, continuous carbon fiber (CF) reinforced polyamide 12 (PA12) composite with an internal soft polymer-based core. Different composite configurations were studied to match the properties of host tissue. Nonlinear three-dimensional analysis of the hip prosthesis was carried out using a three-dimensional finite element Bone model based on the composite femur. The performance of composite-based hip and titanium alloy-based (Ti-6Al-4V) stems embedded into Femoral Bone was compared. The effect of core stiffness and ply configuration was also analyzed. Results show that stresses in composite stem are lower than those in Ti stem, and that the Femoral Bone implanted with composite structure sustains more load than the one implanted with Ti stem. Micromotions in the composite stem are significantly smaller than those in Ti stem over the entire Bone-implant surface because of the favorable interfacial stress distribution.
Paul E Di Cesare - One of the best experts on this subject based on the ideXlab platform.
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reconstruction of the failed Femoral component and proximal Femoral Bone loss in revision hip surgery
Journal of The American Academy of Orthopaedic Surgeons, 2000Co-Authors: Stephen G Maurer, Avi C Baitner, Paul E Di CesareAbstract:Advances in implant technology and surgical techniques have greatly improved the results of Femoral stem revision in total hip arthroplasty. The 10-year results obtained with extensively coated noncemented revision stems parallel those obtained with cemented stems revised by using contemporary techniques. Proximal Femoral Bone loss is an important consideration when planning and performing revision arthroplasty. Proximal Femoral Bone defects can be managed with either metal or Bone. Insignificant defects can be reconstructed by using primary hip arthroplasty techniques. Proximal Femoral replacement prostheses are best restricted to sedentary elderly patients. Cortical strut grafts can be used reliably to reconstruct noncircumferential segmental defects. Calcar allografts are associated with unacceptably high rates of resorption. Proximal Femoral allografts with either noncemented or cemented long-stem prostheses have the potential advantage of biologic soft-tissue attachment and restoration of Bone stock. Impaction allografting with cement is indicated for cavitary defects and may also restore Bone stock. J Am Acad Orthop Surg 2000;8:354-363
