Analysis of a femoral hip prosthesis designed to reduce stress shielding

Joshi, Makarand G.; Advani, Suresh G.; Miller, Freeman; Santare, Michael H.

doi:10.1016/s0021-9290(00)00110-x

Cited by 162 publications

(108 citation statements)

References 19 publications

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“…9,10 The amount of stress shielding depends on stem design and material, bone properties, and stem placement. 11 Ideally, the stress distribution post-implantation should be close to that of the intact bone.…”

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confidence: 99%

“…11 Ideally, the stress distribution post-implantation should be close to that of the intact bone. 10,12 The extent to which the differences between the currently available designs affect the success of the implant is unclear because clinical data are currently scarce. 13 Some preliminary results from follow-up studies that examined patients approximately 6 months after surgery reported radiographic bone resorption in the region 2-3 mm proximal to the ulnar head for the cobalt chrome stemmed SBI implant 7 and 1-2 mm for the titanium stemmed Herbert implant.…”

mentioning

confidence: 99%

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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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confidence: 99%

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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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“…10,11 There are some references available where a mathematical relation between density and mechanical properties in the bone are established. 5,12,13 Currently, the use of computational simulations based on the finite element method (FEM) to establish the stressstrain state over biological tissues is a common practice. The accuracy of the results obtained by these simulations is directly related to the ability of the researcher to reproduce precisely the geometries, the boundary conditions and the mechanical properties of the simulated phenomenon.…”

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confidence: 99%

“…The use of CT as a tool to obtain accurate values of density and then relate them with mechanical properties of the bone is common for numerical models. [12][13][14][15][16][17] Mechanical stresses over the bone stimulate the action of the osteoblast and can generate an increase of local bone density (ossification), 18 which is directly related to bone stiffness. [19][20][21] The ability of the bone to modify its shape and inner structure in response to a change in its load state is known as functional adaptation by remodelling, also known as Wolff`s Law.…”

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Analysis of bone demineralization due to the use of exoprosthesis by comparing Young’s Modulus of the femur in unilateral transfemoral amputees

Ramírez

Isaza

Mariaka

et al. 2011

Prosthetics &Amp; Orthotics International

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Background: There is a relation between Hounsfield units obtained from computed tomography (CT) scans and bone density. The density of the bones can be used to establish its mechanical properties and therefore to assess the bone mechanical condition using CT images. Objectives: To identify the effect of the transfemoral amputation and the use of external lower limb prosthesis in the bone properties, by comparing Young’s modulus. Study Design: Young’s modulus comparison. Methods: Comparison of bone density between the healthy femur and the amputated bone of 20 unilateral transfemoral amputees was done by generating three histograms of the Hounsfield units at different parts of the femur. The histograms were created based on images obtained by CT and the Hounsfield units were translated to Young’s modulus to establish the comparison. Results: The results show a significant difference ( p-value <0.05) between the mean value of Young’s modulus of healthy and amputated bone. Conclusions: There is clearly a direct association between the use of external prosthesis and the bone demineralization due the stress shielding phenomenon. The Young’s modulus comparison using information from CT images can be a suitable tool to analyze the bone demineralization due to the use of exoprosthesis.

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Progress in Research on Biodegradable Magnesium Alloys: A Review

Wen

et al. 2020

Adv Eng Mater

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Magnesium alloys have great potential as biodegradable materials and have attracted much attention in recent years. Much effort has been expended to improve the properties of biodegradable alloys. Herein, various methods for improving the mechanical properties and biocorrosion resistance of magnesium alloys are discussed in detail, including alloying, thermal processing, and surface modification. The mechanisms by which the mechanical properties of alloys are modified are described, including grain refinement strengthening, solid solution strengthening, dislocation strengthening, and precipitation strengthening. On the basis of previous studies, the mechanisms underlying modifications to the biocorrosion resistance of magnesium alloys are summarized as grain refinement, grain growth, the formation of a passivation film, reduction in cathode-anode potential difference, second-phase barrier function, and texture formation. Finally, the remaining problems are summarized and directions for future research are indicated.

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Analysis of a femoral hip prosthesis designed to reduce stress shielding

Cited by 162 publications

References 19 publications

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

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

Analysis of bone demineralization due to the use of exoprosthesis by comparing Young’s Modulus of the femur in unilateral transfemoral amputees

Progress in Research on Biodegradable Magnesium Alloys: A Review

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