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.

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

scholarly journals Development of a Novel in Silico Model to Investigate the Influence of Radial Clearance on the Acetabular Cup Contact Pressure in Hip Implants

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1282 ◽  
Author(s):  
Saverio Affatato ◽  
Massimiliano Merola ◽  
Alessandro Ruggiero
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
In Silico ◽  
Element Model ◽  
Wear Testing ◽  
Radial Clearance ◽  
Maximum Pressure ◽  
Acetabular Cup ◽  
Hip Joint Replacement ◽  
Total Hip

A hip joint replacement is considered one of the most successful orthopedic surgical procedures although it involves challenges that must be overcome. The patient group undergoing total hip arthroplasty now includes younger and more active patients who require a broad range of motion and a longer service lifetime of the implant. The current replacement joint results are not fully satisfactory for these patients’ demands. As particle release is one of the main issues, pre-clinical experimental wear testing of total hip replacement components is an invaluable tool for evaluating new implant designs and materials. The aim of the study was to investigate the cup tensional state by varying the clearance between head and cup. For doing this we use a novel hard-on-soft finite element model with kinematic and dynamic conditions calculated from a musculoskeletal multibody model during the gait. Four different usual radial clearances were considered, ranging from 0 to 0.5 mm. The results showed that radial clearance plays a key role in acetabular cup stress-strain during the gait, showing from the 0 value to the highest, 0.5, a difference of 44% and 35% in terms of maximum pressure and deformation, respectively. Moreover, the presented model could be usefully exploited for complete elastohydrodynamic synovial lubrication modelling of the joint, with the aim of moving towards an increasingly realistic total hip arthroplasty in silico wear assessment accounting for differences in radial clearances.

Study of Micromotion in Modular Acetabular Components During Gait and Subluxation: A Finite Element Investigation

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
F. Amirouche ◽  
F. Romero ◽  
M. Gonzalez ◽  
L. Aram
Keyword(s):  
Finite Element ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Gait Cycle ◽  
Polyethylene Wear ◽  
Element Model ◽  
Element Analysis ◽  
Total Hip ◽  
Normal Gait ◽  
Acetabular Components

Polyethylene wear after total hip arthroplasty may occur as a result of normal gait and as a result of subluxation and relocation with impact. Relocation of a subluxed hip may impart a moment to the cup creating sliding as well as compression at the cup liner interface. The purpose of the current study is to quantify, by a validated finite element model, the forces generated in a hip arthroplasty as a result of subluxation relocation and compare them to the forces generated during normal gait. The micromotion between the liner and acetabular shell was quantified by computing the sliding track and the deformation at several points of the interface. A finite element analysis of polyethylene liner stress and liner/cup micromotion in total hip arthroplasty was performed under two dynamic profiles. The first profile was a gait loading profile simulating the force vectors developed in the hip arthroplasty during normal gait. The second profile is generated during subluxation and subsequent relocation of the femoral head. The forces generated by subluxation relocation of a total hip arthroplasty can exceed those forces generated during normal gait. The induced micromotion at the cup polyethylene interface as a result of subluxation can exceed micromotion as a result of the normal gait cycle. This may play a significant role in the generation of backsided wear. Minimizing joint subluxation by restoring balance to the hip joint after arthroplasty should be explored as a strategy to minimize backsided wear.

scholarly journals Effects of the depth of the acetabular component during simulated acetabulum reaming in total hip arthroplasty

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jianlin Zuo ◽  
Meng Xu ◽  
Xin Zhao ◽  
Xianyue Shen ◽  
Zhongli Gao ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Total Hip Arthroplasty ◽  
Acetabular Component ◽  
Hip Arthroplasty ◽  
Peak Stress ◽  
Element Model ◽  
Coverage Rate ◽  
Acetabular Cup ◽  
Total Hip ◽  
Rotation Center

AbstractWe aimed to evaluate whether there are differences in the rotation center, cup coverage, and biomechanical effects between conventional and anatomical technique. Computed tomography scans of 26 normal hips were used to simulate implantation of acetabular component. The hip rotation center and acetabular component coverage rate were calculated. Moreover, a finite element model of the hip joint was generated to simulate and evaluate the acetabular cup insertion. Micromotion and the peak stress distribution were used to quantify the biomechanical properties. The medial and superior shifts of the rotation center were 5.2 ± 1.8 mm and 1.6 ± 0.7 mm for the conventional reaming technique and 1.1 ± 1.5 mm and 0.8 ± 0.5 mm for anatomical technique, respectively. The acetabular component coverage rates for conventional reaming technique and anatomical technique were 86.8 ± 4% and 70.0 ± 7%, respectively. The micromotion of the cup with conventional reaming technique was greater than that with anatomical technique. The peak stress concentration was highest in the superior portion with conventional reaming technique, whereas with anatomical technique, there was no stress concentration. Paradoxically although the acetabular component coverage rate is larger with conventional reaming technique, anatomical technique provides less micromotion and stress concentration for initial cup stability. Thus, anatomical technique may be more suitable for acetabulum reaming during primary total hip arthroplasty.

CT-based automated planning of acetabular cup for total hip arthroplasty (THA) based on hybrid use of two statistical atlases

2016 ◽  
Vol 11 (12) ◽  
pp. 2253-2271 ◽  
Author(s):  
Yoshiyuki Kagiyama ◽  
Itaru Otomaru ◽  
Masaki Takao ◽  
Nobuhiko Sugano ◽  
Masahiko Nakamoto ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Automated Planning ◽  
Acetabular Cup ◽  
Total Hip
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