Development of hip joint prostheses with modular stems

Bae, Ji-yong; Farooque, Umar; Lee, Kyung-won; Kim, Gyu Ha; Jeon, Insu; Yoon, Tae Mi

doi:10.1016/j.cad.2011.05.004

Cited by 9 publications

(5 citation statements)

References 19 publications

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“…The longer distance between the loading point (proximal end) and the hip joint fixation point (distal end) induces larger bending stresses on the whole joint at distal end. Previous results show that the resultant Von Mises stresses at similar Ti alloy stem range from 186 MPa to 253 MPa [7,34]. The present results show that the possible maximum Von Mises stress at stem is 212 MPa, which occurs in case of 220 mm CoCrMo stem.…”

Section: Resultssupporting

confidence: 51%

“…The short and long term behavior of the total hip joint replacement is dependent on obtaining optimal stresses’ distribution within the bone implant construct [1-3]. The structure, shape and material are the three main factors considered in the design of the hip prosthesis [4-7]. Initially, the artificial hip joint implants are used in orthopedic surgeries without prior pre-clinical testing that may lead to unsatisfactory clinical results.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 51%

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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“…The stress values observed were 97.22, 117, and 128.6 MPa, respectively. A research team led by Bae et al 26 studied the stress distribution of modular hip stems with different cross sections. Authors found that the maximum stresses were in modular and unitary stems having same cross-sectional geometry.…”

Section: Resultsmentioning

confidence: 99%

Musculoskeletal-based finite element analysis of femur after total hip replacement

Meena

Kumar

Pundir

et al. 2016

Proc Inst Mech Eng H

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This article evaluates the effect of stress variation on adult femur following total hip replacement using musculoskeletal-based finite element analysis. The aim was to study the changes in stress distribution in the femur after total hip replacement by providing simulated in vivo loading and boundary conditions. The loading and boundary conditions were generated using a musculoskeletal modelling software 'AnyBody' and were applied on femur model, generated from the computed tomography (CT) scan data for standing posture of male patient. The results showed considerable variation in stress distribution pattern in the femur before and after total hip replacement, the metallic implant taking major loads of human body and transferring very less loads to the femur.

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“…The femoral stem drawing was developed in SolidWorks, based on references [6,[19][20][21][22] . In this production process, the dimensional parameters and shape that would satisfy the bio-mechanical requirements in relation to the request of the weight and the rigidity of the remaining bone.…”

Section: Manufacturing Process Of Femoral Stemmentioning

confidence: 99%

Design of a polymeric composite material femoral stem for hip joint implant

et al. 2019

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Hip joint prosthesis are structural components that still have some challenging problems such as the interaction of physical and biological properties between the stem and the human femur. Composite materials allow to obtain high strength structures with a large variety of modulus of elasticity and favorable characteristics in the context of orthopedic implants. Therefore, the objective of this work was the development of a prosthesis model with biopolymeric matrix, namely the polyurethane (PU) derived from castor oil, reinforced with fiberglass. The implants were made of pure PU, PU with fiberglass, and PU with glass fiber and calcium carbonate. The reinforcement was constructed in the form of a core to be inserted into the hip prosthesis. The core and stem prototypes were produced using three-dimensional printing techniques, and subsequently used in the manufacture of flexible silicone molds. The results showed good mechanical potentialities of this material for orthopedics applications.

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Development of hip joint prostheses with modular stems

Cited by 9 publications

References 19 publications

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

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

Musculoskeletal-based finite element analysis of femur after total hip replacement

Design of a polymeric composite material femoral stem for hip joint implant

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