Effect of cup inclination on predicted contact stress-induced volumetric wear in total hip replacement

Rijavec, Boris; Košak, Robert; Daniel, Matěj; Kralj‐Iglič, Veronika; Dolinar, Drago

doi:10.1080/10255842.2014.916700

Cited by 7 publications

(10 citation statements)

References 21 publications

(30 reference statements)

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“…On the other hand, it has been shown that this could be unfavorable in terms of dislocation [27]. The aim of this work was to provide an answer to the question posed by the results of previous work [27]: whether arthroplasties that have suffered dislocation have a less favorable stress distribution.…”

Section: Introductionmentioning

confidence: 99%

“…Using this method, the hip stress distribution can be calculated in a neutral hip position during a one-legged stance, using a standard X-ray image of the hip and pelvis. It has been validated by clinical studies considering various pathologies in native hips [23,24] and in hips with total hip arthroplasties [25–27].…”

Section: Introductionmentioning

confidence: 99%

“…The HIPSTRESS method demonstrates that linear wear occurs in the direction of the stress pole [25,26] and that it is proportional to the peak stress on the weight bearing area [25]. Because of this effect, the volumetric wear on the cup is less for a larger abduction angle of the cup [27], since the head partly migrates out of the socket [27]. On the other hand, it has been shown that this could be unfavorable in terms of dislocation [27].…”

Section: Introductionmentioning

confidence: 99%

“…Because of this effect, the volumetric wear on the cup is less for a larger abduction angle of the cup [27], since the head partly migrates out of the socket [27]. On the other hand, it has been shown that this could be unfavorable in terms of dislocation [27]. The aim of this work was to provide an answer to the question posed by the results of previous work [27]: whether arthroplasties that have suffered dislocation have a less favorable stress distribution.…”

Section: Introductionmentioning

confidence: 99%

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Hip stress distribution - Predictor of dislocation in hip arthroplasties. A retrospective study of 149 arthroplasties

et al. 2019

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Dislocation after hip arthroplasty is still a major concern. Recent study of the volumetric wear of the cup has suggested that stresses studied in a one-legged stance model could predispose arthroplasty dislocation. The aim of this work was to study whether biomechanical parameters of contact stress distribution in total hip arthroplasty during a neutral hip position can predict a higher possibility of the arthroplasty dislocating. Biomechanical parameters were determined using 3-dimensional mathematical models of the one-legged stance within the HIPSTRESS method. Geometrical parameters were measured from standard anteroposterior X-ray images of the pelvis and proximal femora. Fifty-five patients subjected to total hip arthroplasty that later suffered dislocation of the head and, for comparison, ninety-four total hip arthroplasties that were functional at least 10 years after the implantation, were included in the study. Arthroplasties that suffered dislocation had on average a 6% higher resultant hip force than the control group (p = 0.004), 11% higher peak stress on the load-bearing area (p = 0.001) and a 50% more laterally positioned stress pole (p = 0.026), all parameters being less favorable in the group of unstable arthroplasties. There was no statistically significant difference in the gradient index or in the functional angle of the weight bearing. Our study showed that arthroplasties that show a tendency to push the head out of the cup in the representative body position—the one-legged stance—are prone to dislocation. An unfavorable resultant hip force, peak stress on the load bearing and laterally positioned stress pole are predictors of arthroplasty dislocation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hip stress distribution - Predictor of dislocation in hip arthroplasties. A retrospective study of 149 arthroplasties

et al. 2019

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“…If this takes place at the acetabular rim, the peak stress is calculated according to the expression p max ¼ p 0 cos ðϑ CE À ΘÞ [5]. It was shown that biomechanical parameters calculated with HIPSTRESS models for resultant hip force and contact hip stress were useful in explaining early osteoarthritis in dysplastic hips [7], hips with primary osteoarthritis, hips subject to avascular necrosis of the femoral head [5], hips that were in childhood subject to the Perthes disease [8], effect of different osteotomies [9][10][11][12], and the direction and volumetric wear of total hip endoprosthesis [13]. Evidently, the models include the relevant parameters of the individual hip to have a predictive value.…”

Section: Hipstress Model For Contact Stress In the Hipmentioning

confidence: 99%

Understanding Hip Biomechanics: From Simple Equilibrium to Personalized HIPSTRESS Method

Kralj‐Iglič¹

2017

Developmental Diseases of the Hip - Diagnosis and Management

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It is useful to have a quantitative measure of the contact hip stress and other relevant biomechanical parameters. Parameters that correlate with clinically relevant features are sought and relations between these parameters are studied. For this purpose, two different models for the resultant hip force in the one-legged stance (the primitive model and the HIPSTRESS model) are presented with which the effect of the shape of the pelvis and proximal femora is described. Also, a special case of the primitive model-the simple balance approximation-is considered. All three descriptions are based on the equilibrium of forces of torques and differ by increasing amount of information on the shape of the particular subject. It is shown in a case of normal hip and pelvis geometry that the primitive model gives similar values of biomechanical parameters as the HIPSTRESS model that was validated by clinical studies. The primitive model (but not the simple balance approximation) merits to minimal standards to be used for understanding of the principles of the equilibrium of the forces and torques in the one-legged stance and can in certain cases (such as the one shown) also yield a valid quantitative estimation of the biomechanical parameters.

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Predicting long-term wear performance of hard-on-hard bearing couples: effect of cup orientation

Shankar

Gowthaman

Uddin

2015

Med Biol Eng Comput

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Wear is the major cause of implant failure, resulting in expensive revision surgeries of total hip arthroplasty. Therefore, understanding of wear mechanism and its progression is crucial to improve the physiological performance of implants. This paper presents a three-dimensional (3D) finite element (FE) wear modeling approach to estimate evolution of wear in hard-on-hard bearing components with the effect of cup abduction angle. Three bearing couples were considered, and they were PCD-on-PCD, Al2O3-on-Al2O3 and Si3N4-on-Si3N4, while the cup abduction angle varied from 35° to 70° with an increment of 5°. By adopting actual physiological hip gait loading and rotational movement for normal walking cycle in FE modeling, the contact pressure and the sliding distance were calculated to predict wear. A femoral head of 32 mm in diameter was considered, while a constant frictional contact at the inference between head and cup was used. During simulation, the geometry of cup surface was updated at a reasonable interval of gait cycles to consider the effect of wear. Wear was simulated for up to 20 million cycles which is an equivalent of 20 years of implant's life in human body. Simulation results showed that compared to other two bearing couples, the predicted linear and volumetric wear in PCD-on-PCD couple exhibited the least wear evolution for all cup angles considered. The increase in abduction angle from 35° to 70° decreases the volumetric wear by 28 % for all three bearing couples, due to the reduction in sliding distance. Steep cup angle, e.g., 70° for Al2O3 and Si3N4 bearing couples, encountered edge contact, which leads to more wear. Further, wear results were discussed and analyzed with respect to in vitro and/or clinical studies available in the literature to justify the efficacy of wear modeling.

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Effect of cup inclination on predicted contact stress-induced volumetric wear in total hip replacement

Cited by 7 publications

References 21 publications

Hip stress distribution - Predictor of dislocation in hip arthroplasties. A retrospective study of 149 arthroplasties

Hip stress distribution - Predictor of dislocation in hip arthroplasties. A retrospective study of 149 arthroplasties

Understanding Hip Biomechanics: From Simple Equilibrium to Personalized HIPSTRESS Method

Predicting long-term wear performance of hard-on-hard bearing couples: effect of cup orientation

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