Finite Element Modelling for Assessing Effect of Acetabular Component Orientation on the Basic Stress Path above Acetabular Dome

Nie, Yong; Pei, Fu Xing; Li, Zong Ming

doi:10.1111/os.12148

Cited by 4 publications

(4 citation statements)

References 33 publications

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“…Design and evaluation of hip joint replacement designs often utilise FEA modelling of the pelvis [14,22,34]. This requires knowledge of the best way to model the pelvic joints in order to represent the in vivo conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Evaluation of these design factors often utilises computational methods such as multi-body dynamics and musculoskeletal (MS) modelling to predict loading in the normal joint [6][7][8], and after prosthetic implantation [9]. This has been used in conjunction with finite element analysis (FEA) to estimate stress distributions in the femoral stem [10,11] and acetabular cup [12], wear rates [13] and to assess bone remodelling after implantation [14]. However, to evaluate such factors it is important to understand the force transfer through the hip joint during normal loading conditions.…”

Section: Introductionmentioning

confidence: 99%

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The effect of boundary constraints on finite element modelling of the human pelvis

Watson

Dostanpor

Fagan

et al. 2017

Medical Engineering & Physics

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The use of finite element analysis (FEA) to investigate the biomechanics of anatomical systems critically relies on the specification of physiologically representative boundary conditions. The biomechanics of the pelvis has been the specific focus of a number of FEA studies previously, but it is also a key aspect in other investigations of, for example, the hip joint or new design of hip prostheses. In those studies, the pelvis has been modelled in a number of ways with a variety of boundary conditions, ranging from a model of the whole pelvic girdle including soft tissue attachments to a model of an isolated hemi-pelvis. The current study constructed a series of FEA models of the same human pelvis to investigate the sensitivity of the predicted stress distributions to the type of boundary conditions applied, in particular to represent the sacro-iliac joint and pubic symphysis. Varying the method of modelling the sacro-iliac joint did not produce significant variations in the stress distribution, however changes to the modelling of the pubic symphysis were observed to have a greater effect on the results. Over-constraint of the symphysis prevented the bending of the pelvis about the greater sciatic notch, and underestimated high stresses within the ilium. However, permitting medio-lateral translation to mimic widening of the pelvis addressed this problem. These findings underline the importance of applying the appropriate boundary conditions to FEA models, and provide guidance on suitable methods of constraining the pelvis when, for example, scan data has not captured the full pelvic girdle. The results also suggest a valid method for performing hemi-pelvic modelling of cadaveric or archaeological remains which are either damaged or incomplete.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of boundary constraints on finite element modelling of the human pelvis

Watson

Dostanpor

Fagan

et al. 2017

Medical Engineering & Physics

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“…Nie et al found that stress in acetabular dome is concentrated in the acetabular rime, the superior part of the lunate surface, and the posterior–superior surface of acetabulum in normal hip joint, while the highest stress is in the posterior hemitransverse fracture area. 16 These findings explain why we have observed a significantly lower displacement of the posterior column fracture gap in the 2-stage protocol compared to the 1-stage. In the 2-stage protocol, the acetabular dome was secured by 2 plates above the dome, and the anterior column fixation has possibly neutralized stress in the posterior hemitransverse fracture zone.…”

Section: Discussionmentioning

confidence: 56%

Different Stabilization Techniques for Type 62B3 Acetabular Fractures in Combination With Primary Total Hip Arthroplasty in Elderly Patients

Uvarovas

Šatkauskas

Urbonavičius

et al. 2016

Geriatr Orthop Surg Rehabil

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Introduction:The total hip arthroplasty (THA) as part of acute fracture management is used for acetabular fractures in elderly patients. Our objective was to assess the stability of osteosynthesis performed using 2 different techniques in combination with THA in an experimental model.Materials and Methods:We conducted 20 experiments using the left-side hemipelves composite bone models. There were 2 testing groups: 1- and 2-stage osteosynthesis. The acetabular fractures of the anterior column and posterior hemitransverse were simulated. The same THA technique was used in both groups. The stability of osteosynthesis was explored and compared between the groups by measuring the fracture displacement of anterior and posterior columns under the standardized test load (1187 N) protocol. Load distance diagrams were generated.Results:The 0.680-mm gap (0.518; 1.548) of the posterior column in the 1-stage group (n = 10) was higher than the 0.370-mm gap (0.255; 0.428) in the 2-stage group (n = 10; P = .002). There was no significant difference between the gap of the anterior column in the 1- and 2-stage groups (0.135 [0.078; 0.290] mm vs 0.160 [0.120; 0.210] mm; P = .579).Conclusion:The 2-stage osteosynthesis of the anterior and posterior columns in combination with THA provides better stability of posterior column when compared to 1-stage method in composite bone models.

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“…The fully constrained boundary condition has been applied on the sacroiliac joint and the pubis symphysis. 9,11,26–28…”

Section: Methodsmentioning

confidence: 99%

The effect of cement mantle thickness on strain energy density distribution and prediction of bone density changes around cemented acetabular component

Sanjay

Mondal

Bhutani

et al. 2018

Proc Inst Mech Eng H

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Cement mantle thickness is known to be one of the important parameters to reduce the failure of the cemented acetabular component. The thickness of the cement mantle is also often influenced by the positioning of the acetabular cup. The aim of this study is to determine the effect of uniform and non-uniform cement mantle thickness on strain energy density distribution and prediction of the possibility of bone remodelling around the acetabular region. Furthermore, tensile stress distribution in the cement mantle due to non-uniform cement mantle thickness was also investigated. Three-dimensional finite element models of intact and 17 implanted pelvic bone were developed based on computed tomography data sets. Results indicate that implantation with non-uniform cement thickness variation in the anterior-posterior direction has a significant influence on strain energy density distribution around the acetabulum as compared to thickness variation in the superior-inferior direction. Increase in density is predicted at the anterior part of the acetabulum, whereas density decrease is predicted at the posterior, inferior and superior part of the acetabulum. The non-uniform cement mantle thickness affected the tensile stress distribution in the cement mantle, in particularly superiorly placed acetabular cup. This study concludes that uniform cement thickness is desired for the longer success of the cemented acetabular component.

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Finite Element Modelling for Assessing Effect of Acetabular Component Orientation on the Basic Stress Path above Acetabular Dome

Abstract: Acetabular component orientation affects the basic stress path above the acetabular dome. Thus, orientation should be considered when attempting to restore normal biomechanics in the main load-bearing area.

Cited by 4 publications

References 33 publications

The effect of boundary constraints on finite element modelling of the human pelvis

The effect of boundary constraints on finite element modelling of the human pelvis

Different Stabilization Techniques for Type 62B3 Acetabular Fractures in Combination With Primary Total Hip Arthroplasty in Elderly Patients

The effect of cement mantle thickness on strain energy density distribution and prediction of bone density changes around cemented acetabular component

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