scholarly journals Anatomic grooved stem mitigates strain shielding compared to established total hip arthroplasty stem designs in finite-element models

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Mark Heyland ◽  
Sara Checa ◽  
Daniel Kendoff ◽  
Georg N. Duda
Keyword(s):  
Finite Element ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Finite Element Models ◽  
Total Hip ◽  
Strain Shielding

scholarly journals Specimen-Specific Finite Element Models for Predicting Fretting Wear in Total Hip Arthroplasty Tapers

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Andrew P. Baumann ◽  
Oleg Vesnovsky ◽  
L. D. Timmie Topoleski ◽  
Finn E. Donaldson ◽  
Nicole L. L. McMinn ◽  
...  
Keyword(s):  
Finite Element ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Predictive Ability ◽  
Fretting Wear ◽  
Design Parameters ◽  
Finite Element Models ◽  
Total Hip ◽  
Automated Imaging ◽  
Tissue Reactions

Abstract Products from fretting wear and corrosion in the taper junction of total hip arthroplasty (THA) devices can lead to adverse local tissue reactions. Predicting damage as a function of design parameters would aid in the development of more robust devices. The objectives of this study were to develop an automated method for identifying areas of fretting wear on THA taper junctions, and to assess the predictive ability of a finite element model to simulate fretting wear in THA taper junctions. THA constructs were fatigue loaded, thus inducing damage on the stem taper. An automated imaging and analysis algorithm quantified fretting wear on the taper surfaces. Specimen-specific finite element models were used to calculate fretting work done (FWD) at the taper junction. Simulated FWD was correlated to imaged fretting wear. Results showed that the automated imaging approach identified fretting wear on the taper surface. Additionally, finite element models showed the greatest predictive ability for tapers exhibiting distal contact. Finite element models predicted an average of 30.3% of imaged fretting wear. With additional validation, the imaging and finite element techniques may be useful to manufacturers and regulators in the development and review of new THA devices.

scholarly journals Static structural analysis of different stem designs used in total hip arthroplasty using finite element method

Heliyon ◽  
2019 ◽  
Vol 5 (6) ◽  
pp. e01767 ◽  
Author(s):  
Chethan K.N. ◽  
Mohammad Zuber ◽  
Shyamasunder Bhat N. ◽  
Satish Shenoy B. ◽  
Chandrakant R. Kini
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structural Analysis ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Total Hip ◽  
Element Method

Finite element model of a novel short stemmed total hip arthroplasty implant developed from cross sectional CT scans

2013 ◽  
Vol 21 (5) ◽  
pp. 493-500 ◽  
Author(s):  
Matthias Lerch ◽  
Nelly Weigel ◽  
Henning Windhagen ◽  
Max Ettinger ◽  
Fritz Thorey ◽  
...  
Keyword(s):  
Finite Element ◽  
Total Hip Arthroplasty ◽  
Finite Element Model ◽  
Hip Arthroplasty ◽  
Element Model ◽  
Ct Scans ◽  
Cross Sectional ◽  
Total Hip

Femoral strain changes after total hip arthroplasty — patient-specific finite element analyses 12 years after operation

2005 ◽  
Vol 27 (8) ◽  
pp. 649-654 ◽  
Author(s):  
Markus Lengsfeld ◽  
Rene Burchard ◽  
Daniel Günther ◽  
Thomas Pressel ◽  
Jan Schmitt ◽  
...  
Keyword(s):  
Finite Element ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Patient Specific ◽  
Finite Element Analyses ◽  
Total Hip

Total hip arthroplasty-finite element analysis validation

2002 ◽  
Author(s):  
D. Leone ◽  
L. Breglia ◽  
J. Gander ◽  
J. Ibets ◽  
C. Teeling ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Element Analysis ◽  
Total Hip

scholarly journals Mid-Term Results of Total Hip Arthroplasty Using A Three-Dimensional Porous Titanium Acetabular Cup: An Examination of Micromotion Using Subject-Specific Finite Element Analysis

2021 ◽  
Author(s):  
Takaki Miyagawa ◽  
Kazu Matsumoto ◽  
Shingo Komura ◽  
Haruhiko Akiyama
Keyword(s):  
Finite Element ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Three Dimensional ◽  
Porous Titanium ◽  
Fe Analysis ◽  
Total Hip ◽  
Radiolucent Lines ◽  
Subject Specific

Abstract Background: We investigated the mid-term clinical and radiological results of total hip arthroplasty (THA) using a three-dimensional (3D) porous titanium cup and analysed the micromotion at the interface of the cup using subject-specific finite element (FE) analysis. Methods: We evaluated 73 hips of 65 patients (6 men and 59 women; mean age at the time of surgery 62.2 years, range 45-86 years) who had undergone THA using a 3D porous titanium cup. Clinical evaluation was performed using the Japanese Orthopaedic Association (JOA) hip score system. We assessed the fixation of the acetabular component based on the presence of radiolucent lines and cup migration using anteroposterior radiographs. Subject-specific FE models were constructed from computed tomography data. Results: The JOA score improved from a preoperative mean of 52.2 (range, 23-82) to a mean of 87.8 (range, 71-100) at the final follow-up. None of the patients underwent revisions during the follow-up period. Radiolucent lines were observed in 26 cases (35.6%) and frequently appeared at DeLee and Charnley Zone 3. In the FE analysis, the micromotion at DeLee and Charnley Zone 3 was significantly larger than that at Zones 1 and 2. Furthermore, micromotion was large in the groups in which radiolucent lines appeared at Zone 3. Conclusions: The mid-term clinical outcome of THA using a 3D porous titanium cup was excellent. However, radiolucent lines frequently appeared at DeLee and Charnley Zone 3. FE analysis indicated that micromotion was large at the same site, strongly suggesting that it contributes to the emergence of radiolucent lines. The 3D porous titanium cups are useful in THA, and with improvements focused on micromotion, we anticipate better long-term outcomes.

scholarly journals Metaphyseal anchoring short stem hip arthroplasty provides a more physiological load transfer: a comparative finite element analysis study

2020 ◽  
Author(s):  
Shuang G Yan ◽  
Yan Chevalier ◽  
Fanxiao Liu ◽  
Xingyi Hua ◽  
Anna Schreiner ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Load Transfer ◽  
High Stress ◽  
Short Stem ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Total Hip

Abstract Background: Short stem total hip arthroplasty (SHA) preserves femoral bone stock and is supposed to provide a more natural load transfer compared to standard stem total hip arthroplasty (THA). As comparative biomechanical reference data are rare we used a finite element analysis (FEA) approach to compare cortical load transfer after implantations of a metaphyseal anchoring short and standard stem in native biomechanical femora. Methods: The subject specific finite element models of biomechanical femora, one native and two with implanted metaphyseal anchoring SHA (Metha, B.Braun Aesculap) and standard THA (CLS, Zimmer-Biomet), were generated from computed tomography datasets. The loading configuration was performed with an axial force of 1400 N. Von Mises stress was used to investigate the change of cortical stress distribution. Results: Compared to the native femur, a considerable reduction of cortical stress was recorded after implantation of SHA and standard THA. The SHA showed less reduction proximally with a significant higher metaphyseal cortical stress compared to standard THA. Moreover, the highest peak stresses were observed metaphyseal for the SHA stem while for the standard THA high stress pattern was observed more distally. Conclusions: Both, short and standard THA, cause unloading of the proximal femur. However, the metaphyseal anchoring SHA features a clearly favorable pattern in terms of a lower reduction proximally and improved metaphyseal loading, while standard THA shows a higher proximal unloading and more distal load transfer. These load pattern implicate a reduced stress shielding proximally for metaphyseal anchoring SHA stems and might be able to translate in a better bone preservation.

scholarly journals Short stem hip arthroplasty provides a more physiological load transfer: a comparative finite element analysis study

2020 ◽  
Author(s):  
Shuang G Yan ◽  
Yan Chevalier ◽  
Fanxiao Liu ◽  
Xingyi Hua ◽  
Anna Schreiner ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Load Transfer ◽  
High Stress ◽  
Short Stem ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Total Hip

Abstract Background: Short stem total hip arthroplasty (SHA) preserves femoral bone stock and is supposed to provide a more natural load transfer compared to standard stem total hip arthroplasty (THA). As comparative biomechanical reference data are rare we used a finite element analysis (FEA) approach to compare cortical load transfer after implantations of a cementless short and standard stem in native biomechanical femora.Methods: The subject specific finite element models of biomechanical femora, one native and two with implanted SHA (Metha, B.Braun Aesculap) and standard THA (CLS, Zimmer-Biomet), were generated from computed tomography datasets. The loading configuration was performed with an axial force of 1400 N. Von Mises stress was used to investigate the change of cortical stress distribution.Results: Compared to the native femur, a considerable reduction of cortical stress was recorded after implantation of SHA and standard THA. The SHA showed less reduction proximally with a significant higher metaphyseal cortical stress compared to standard THA. Moreover, the highest peak stresses were observed metaphyseal for the SHA stem while for the standard THA high stress pattern was observed more distally.Conclusions: Both, short and standard THA, cause unloading of the proximal femur. However, SHA features a clearly favorable pattern in terms of a lower reduction proximally and improved metaphyseal loading, while standard THA shows a higher proximal unloading and more distal load transfer. These load pattern implicate a reduced stress shielding proximally for SHA and might be able to translate in a better bone preservation.

Experimental and Finite Element Investigation of Cementless Cup/Bone Interface After Total Hip Arthroplasty

2004 ◽  
Author(s):  
Ivan Zivkovic ◽  
Farid Amirouche ◽  
Francisco Romero ◽  
Mark Gonzalez
Keyword(s):  
Finite Element ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Bone Ingrowth ◽  
Element Model ◽  
Loading Conditions ◽  
Acetabular Cup ◽  
Bone Interface ◽  
Total Hip ◽  
Cementless Cup

Permanent fixation of a cementless total hip arthroplasty requires bone ingrowth into the femoral and acetabular components. Early micromotion at the acetabular cup/bone interface can preclude ingrowth threatening long term fixation. To better characterize micromotion of the interface under loading conditions, an experimental and finite element (FE) study was undertaken. In this study cadaver hemi-pelvises were implanted with cementless acetabular cups and subjected to cyclical axial load and torque. Detailed finite element model, validated with experimental results, was developed to further analyze the conditions affecting the initial stability and loosening of the interface for different loading conditions.

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