Effects of Materials of Cementless Femoral Stem on the Functional Adaptation of Bone

Gong, He; Wu, Wei; Fang, Jun; Dong, Xiaoli; Zhao, Meisheng; Guo, Tongtong

doi:10.1016/s1672-6529(11)60098-x

Cited by 31 publications

(27 citation statements)

References 20 publications

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“…FG longitudinal and radial prostheses with a volume fraction exponent of zero (conventional material (Ti)) and three exhibited the minimum and maximum strain energies at the proximal part of the femur, respectively. These finding are compatible with the presented results for THR by Kuiper and Huiskes [19], Hedia et al [20,21], Gong et al [22], and Enab and Bondok [18] for THR. In the cemented THR, a part of the loads was absorbed by the cement layer by transferring the loads to the bone [11].…”

Section: Discussionsupporting

confidence: 93%

“…, Gong et al . , and Enab and Bondok for THR. In the cemented THR, a part of the loads was absorbed by the cement layer by transferring the loads to the bone .…”

Section: Discussionmentioning

confidence: 99%

“…, and Gong et al . presented the stress shielding and interface shear stresses reduction by employing FG prostheses in THR.…”

Section: Introductionmentioning

confidence: 99%

“…Enab and Bondok [18] conducted finite element analysis (FEA) on a tibia tray made by FGMs and found less stress shielding in the bony structures around the tibia try. Kuiper and Huiskes [19], Hedia et al [20,21], and Gong et al [22] presented the stress shielding and interface shear stresses reduction by employing FG prostheses in THR.…”

Section: Introductionmentioning

confidence: 99%

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Finite element analysis on longitudinal and radial functionally graded femoral prosthesis

Oshkour

Osman

Davoodi

et al. 2013

Numer Methods Biomed Eng

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This study focused on developing a 3D finite element model of functionally graded femoral prostheses to decrease stress shielding and to improve total hip replacement performance. The mechanical properties of the modeled functionally graded femoral prostheses were adjusted in the sagittal and transverse planes by changing the volume fraction gradient exponent. Prostheses with material changes in the sagittal and transverse planes were considered longitudinal and radial prostheses, respectively. The effects of cemented and noncemented implantation methods were also considered in this study. Strain energy and von Mises stresses were determined at the femoral proximal metaphysis and interfaces of the implanted femur components, respectively. Results demonstrated that the strain energy increased proportionally with increasing volume fraction gradient exponent, whereas the interface stresses decreased on the prostheses surfaces. A limited increase was also observed at the surfaces of the bone and cement. The periprosthetic femur with a noncemented prosthesis exhibited higher strain energy than with a cemented prosthesis. Radial prostheses implantation displayed more strain energy than longitudinal prostheses implantation in the femoral proximal part. Functionally graded materials also increased strain energy and exhibited promising potentials as substitutes of conventional materials to decrease stress shielding and to enhance total hip replacement lifespan.

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Section: Discussionsupporting

confidence: 93%

“…, Gong et al . , and Enab and Bondok for THR. In the cemented THR, a part of the loads was absorbed by the cement layer by transferring the loads to the bone .…”

Section: Discussionmentioning

confidence: 99%

“…, and Gong et al . presented the stress shielding and interface shear stresses reduction by employing FG prostheses in THR.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Finite element analysis on longitudinal and radial functionally graded femoral prosthesis

Oshkour

Osman

Davoodi

et al. 2013

Numer Methods Biomed Eng

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“…Hedia HS et al [21,22] studied the effect of using 2D-FG Material cement less hip stem material in the reduction of bone resorption around cement less hip implants. The results indicated that the recommended FG stem reduced the stress shielding and reduced the maximum interface shear stress at the lateral and medial sides of the femur in comparison with Ti stem.…”

Section: Introductionmentioning

confidence: 99%

In vitro assessment of Function Graded (FG) artificial Hip joint stem in terms of bone/cement stresses: 3D Finite Element (FE) study

Al-Jassir

Fouad

Alothman

2013

BioMedical Engineering OnLine

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BackgroundStress shielding in the cemented hip prosthesis occurs due to the mismatching in the mechanical properties of metallic stem and bone. This mismatching in properties is considered as one of the main reasons for implant loosening. Therefore, a new stem material in orthopedic surgery is still required. In the present study, 3D finite element modeling is used for evaluating the artificial hip joint stem that is made of Function Graded (FG) material in terms of joint stress distributions and stem length.Method3D finite element models of different stems made of two types of FG materials and traditional stems made of Cobalt Chromium alloy (CoCrMo) and Titanium alloy (Ti) were developed using the ANSYS Code. The effects on the total artificial hip joint stresses (Shear stress and Von Mises stresses at bone cement, Von Mises stresses at bone and stem) due to using the proposed FG materials stems were investigated. The effects on the total artificial hip joint system stresses due to using different stem lengths were investigated.ResultsUsing FG stem (with low stiffness at stem distal end and high stiffness at its proximal end) resulted in a significant reduction in shear stress at the bone cement/stem interface. Also, the Von Mises stresses at the bone cement and stem decrease significantly when using FG material instead of CoCrMo and Ti alloy. The stresses’ distribution along the bone cement length when using FG material was found to be more uniform along the whole bone cement compared with other stem materials. These more uniform stresses will help in the reduction of the artificial hip joint loosening rate and improve its short and long term performance.ConclusionFE results showed that using FG stem increases the resultant stresses at the femur bone (reduces stress shielding) compared to metallic stem. The results showed that the stem length has significant effects on the resultant shear and Von Mises stresses at bone, stem and bone cement for all types of stem materials.

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A numerical investigation for the development of functionally graded Ti/HA tibial implant for total ankle replacement: Influence of material gradation law and volume fraction index

Jyoti,

Ghosh

2024

J Biomed Mater Res

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Stress shielding is one of the major concerns for total ankle replacement implants nowadays, because it is responsible for implant‐induced bone resorption. The bone resorption contributes to the aseptic loosening and failure of ankle implants in later stages. To reduce the stress shielding, improvements can be made in the implant material by decreasing the elastic mismatch between the implant and the tibia bone. This study proposes a new functionally graded material (FGM) based tibial implant for minimizing the problem of stress shielding. Three‐dimensional finite element (FE) models of the intact tibia and the implanted tibiae were created to study the influence of material gradation law and volume fraction index on stress shielding and implant‐bone micromotion. Different implant materials were considered that is, cobalt–chromium, titanium (Ti), and FGM with Ti at the bottom and hydroxyapatite (HA) at the top. The FE models of FGM implants were generated by using different volume fractions and the rule of mixtures. The rule of mixtures was used to calculate the FGM properties based on the local volume fraction. The volume fraction was defined by using exponential, power, and sigmoid laws. For the power and sigmoid law varying volume fraction indices (0.1, 0.2, 0.5, 1, 2, and 5) were considered. The geometry resembling STAR® ankle system tibial implant was considered for the present study. The results indicate that FGMs lower stress shielding but also marginally increase implant‐bone micromotion; however, the values were within the acceptable limit for bone ingrowth. It is observed that the material gradation law and volume fraction index influence the performance of FGM tibial implants. The tibial implant composed of FGM using power law with a volume fraction index of 0.1 was the preferred option because it showed the least stress shielding.

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Effects of Materials of Cementless Femoral Stem on the Functional Adaptation of Bone

Cited by 31 publications

References 20 publications

Finite element analysis on longitudinal and radial functionally graded femoral prosthesis

Finite element analysis on longitudinal and radial functionally graded femoral prosthesis

In vitro assessment of Function Graded (FG) artificial Hip joint stem in terms of bone/cement stresses: 3D Finite Element (FE) study

A numerical investigation for the development of functionally graded Ti/HA tibial implant for total ankle replacement: Influence of material gradation law and volume fraction index

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