Influence of the Clearance on In-Vitro Tribology of Large Diameter Metal-on-Metal Articulations Pertaining to Resurfacing Hip Implants

Rieker, C; Schön, R.; Konrad, Reto; Liebentritt, Gernot; Gnepf, Patric; Shen, M C.; Roberts, Paul R.; Grigoris, P.

doi:10.1016/j.ocl.2005.02.004

Cited by 117 publications

(70 citation statements)

References 16 publications

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“…In a tribologic study of MOM performance in a hip simulator, Dowson et al [3] recommended femoral heads be as large as possible with minimal diametral clearance to establish a scenario of mixed-film lubrication. Similarly, in an in vitro study, Rieker et al [13] showed maintaining a lower diametral clearance produced lower amounts of run-in wear compared with cups having relatively high diametral clearances. However, clearance that is too tight paired with large component deformation from press-fit implantation and gait loading could potentially increase frictional torsion, resulting in component loosening.…”

Section: Introductionmentioning

confidence: 92%

“…The role of diametral clearance in THA lies in the establishment of elastohydrodynamic lubrication between the femoral head and acetabular bearing surface in metalon-metal (MOM) device designs [3,13,18]. In a tribologic study of MOM performance in a hip simulator, Dowson et al [3] recommended femoral heads be as large as possible with minimal diametral clearance to establish a scenario of mixed-film lubrication.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acetabular Cup Design Influences Deformational Response in Total Hip Arthroplasty

Meding

Small

Jones³

et al. 2013

Clinical Orthopaedics &Amp; Related Research

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Background Press-fit acetabular components are susceptible to deformation in an underreamed socket, with excessive deformation of metal-on-metal (MOM) components potentially leading to increased torsional friction and micromotion. Specifically, however, it remains unclear how cup diameter, design, and time from implantation affect shell deformation. Questions/purposes We asked whether (1) changes in component geometry and material altered maximum shell deformation and (2) time-dependent deformational relaxation processes occurred. Methods Diametral deformation was quantified after press-fit implantation of metal shells into a previously validated polyurethane model. Experimental groups (n = 6-8) consisted of 48-, 54-, 60-, and 66-mm MOM cups of 6-mm wall thickness, 58-mm cups of 10-mm wall thickness, and CoCrMo and Ti6Al4V 58-mm modular cups. Results Greater cup diameter, thinner wall construction, and Ti6Al4V modular designs generated conditions for maximum shell deformation ranging from 0.047 to 0.267 mm. Relaxation (18%-32%) was observed 120 hours postimplantation in thin-walled and modular designs. ConclusionsOur findings demonstrate a reduction of shell deformation over time and suggest, under physiologic loading, early component deformation varies with design. Clinical Relevance Component deformation should be a design consideration regardless of bearing surface. Designs neglecting to adequately address deformational changes in vivo could be susceptible to diminished cup survival, increased wear, and premature revision.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Acetabular Cup Design Influences Deformational Response in Total Hip Arthroplasty

Meding

Small

Jones³

et al. 2013

Clinical Orthopaedics &Amp; Related Research

View full text Add to dashboard Cite

show abstract

“…Actually, the model is based on Archard's law which imposes a linearity wear rate versus the number of cycles. But many works, such as [23] , [12], show that this relationship is not linear. The model could be enhanced by taking variations in the wear factor into account to estimate wear beyond 1 million cycles.…”

Section: Resultsmentioning

confidence: 99%

An implicit numerical method for wear modeling applied to a hip joint prosthesis problem

Jourdan¹,

Samida²

2009

Computer Methods in Applied Mechanics and Engineering

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Some phenomenological wear models exist, but they are most of the time used to post-process numerical simulations. In certain situations however, material loss may be sufficient to change the contact area, contact stresses. In such cases, coupling the wear loss estimation to the mechanical contact modelling becomes essential. It can be done, and is done most of the time, by updating geometry between time-

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“…This parameter is analogous to the joint clearance parameter that is measured and discussed in reference to metal-on-metal total joint replacements. [21][22][23][24] Joint incongruity was defined as the 3D difference in the spatial location between the center of the sphere that best fit the femoral head and the center of the sphere that best fit the acetabular articulating surface.…”

Section: Hip Morphological Parametersmentioning

confidence: 99%

Novel three‐dimensional MRI technique for study of cartilaginous hip surfaces in Legg‐Calvé‐Perthes disease

Pienkowski

Resig

Talwalkar

et al. 2009

Journal Orthopaedic Research

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Treatment of Legg-Calvé-Perthes disease (LCPD) may improve if new knowledge can be obtained regarding how articular cartilage changes shape during the course of this disorder. A new technique is presented showing how analyses of magnetic resonance images can be used to quantify the three-dimensional changes in the femoral and acetabular articulating cartilage surfaces of children with LCPD. Ten male subjects (8 AE 1 years) with unilateral LCPD were enrolled in this IRB approved study. Sets of magnetic resonance images of both hips were obtained at three different times. Three-dimensional virtual models of the cartilage were created from these images, and mathematical spheres were fit to the articulating surfaces. Five parameters (size, shape deformity (sphericity error), radial growth rate, joint fit, and joint incongruity) were used to quantify cartilage surface shape. Data were analyzed by using a linear mixed-model. Joint incongruity, i.e., the distance between the centers of the femoral and acetabular spheres, was slightly more than 2.5 times larger (p ¼ 0.001) in LCPD hips than the contralateral normal hips. Cartilage shape deformity was 65% larger in hips with LCPD than in normal hips. Growth rates of the femoral head and the opposing acetabular surface showed that distortion of the femoral surface occurred first and the opposing acetabular surface followed. Mean radial difference (acetabular surface radius minus femoral surface radius) in LCPD hips was less than half (p < 0.01) the value of normal hips. Interobserver variability was $10% of the value attributable to LCPD. This is the first known report presenting a technique that quantifies the three-dimensional size, deformity, growth, fit. and incongruity of the femoral and acetabular articulating cartilaginous surfaces of LCPD and contralateral normal hips. The data obtained support the use of this technique and provide pilot data for a future clinical study of LCPD. Objective assessment of cartilage shape enabled by this technique may aid future diagnoses, enable monitoring of three-dimensional femoral and acetabular remodeling, and permit quantitative assessment of treatment efficacy. ß

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Influence of the Clearance on In-Vitro Tribology of Large Diameter Metal-on-Metal Articulations Pertaining to Resurfacing Hip Implants

Cited by 117 publications

References 16 publications

Acetabular Cup Design Influences Deformational Response in Total Hip Arthroplasty

Acetabular Cup Design Influences Deformational Response in Total Hip Arthroplasty

An implicit numerical method for wear modeling applied to a hip joint prosthesis problem

Novel three‐dimensional MRI technique for study of cartilaginous hip surfaces in Legg‐Calvé‐Perthes disease

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