Retrieval of Ceramic Wear Couples in Total Hip Arthroplasty

Willmann, G.; Schikora, N.; Pitto, Rocco P.

doi:10.4028/www.scientific.net/kem.240-242.813

Cited by 3 publications

(7 citation statements)

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“…6 Extensive testing has shown that Al 2 O 3 implants that meet or exceed ISO standards have excellent resistance to dynamic and impact fatigue and also resist subcritical crack growth. 19,20 An increase in average grain size to >7 m can decrease mechanical properties by ∼20%. High concentrations of sintering aids must be avoided, because they remain in the grain boundaries and degrade fatigue resistance, especially in the corrosive physiological environment.…”

Section: (3) Almost-inert Crystalline Bioceramicsmentioning

confidence: 99%

Bioceramics

Hench

1998

Journal of the American Ceramic Society

2,689

1,800

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Ceramics used for the repair and reconstruction of diseased or damaged parts of the musculo‐skeletal system, termed bioceramics, may be bioinert (e.g., alumina and zirconia), resorbable (e.g., tricalcium phosphate), bioactive (e.g., hydroxyapatite, bioactive glasses, and glass‐ceramics), or porous for tissue ingrowth (e.g., hydroxyapatite‐coated metals). Applications include replacements for hips, knees, teeth, tendons, and ligaments and repair for periodontal disease, maxillofacial reconstruction, augmentation and stabilization of the jaw bone, spinal fusion, and bone repair after tumor surgery. Pyrolytic carbon coatings are thromboresistant and are used for prosthetic heart valves. The mechanisms of tissue bonding to bioactive ceramics have resulted in the molecular design of bioceramics for interfacial bonding with hard and soft tissue. Bioactive composites are being developed with high toughness and elastic modulus that match with bone. Therapeutic treatment of cancer has been achieved by localized delivery of radioactive isotopes via glass beads. Clinical success of bioceramics has led to a remarkable advance in the quality of life for millions of people.

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Section: (3) Almost-inert Crystalline Bioceramicsmentioning

confidence: 99%

Bioceramics

Hench

1998

Journal of the American Ceramic Society

2,689

1,800

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“…Alumina turns white when it is sintered in reducing atmosphere or if it contains traces of silica (Willmann, 2003). Alumina is generally white but can sometimes be pink (88% alumina) or brown (96% alumina).…”

Section: Physical Properties Of Aluminamentioning

confidence: 99%

“…A retrieval analysis of two ceramic couples was conducted by Willmann et al (2003). Two hemispheric press-fi t cups with a Biolox® Forte ceramic inlay were retrieved and analysed after 24 months of in vivo function.…”

Section: Bioloxmentioning

confidence: 99%

Alumina ceramics

Ben‐Nissan¹,

Choi²,

Cordingley³

2008

Bioceramics and Their Clinical Applications

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“…Many past/current methods—oil drop counting, shadow graphs, gravimetric measurements, radiostereometric analysis (RSA), and coordinate measuring machines (CMM)—yield ambiguous results. In addition, continuing improvements in implant materials (ceramic–ceramic, and metal–metal) produce ever‐smaller amounts of wear that must be accurately quantified to predict possible negative side effects 1–8…”

Section: Introductionmentioning

confidence: 99%

“…In addition, continuing improvements in implant materials (ceramicceramic, and metal-metal) produce ever-smaller amounts of wear that must be accurately quantified to predict possible negative side effects. [1][2][3][4][5][6][7][8] Even after decades of use, our ability to provide quantitative analysis of implant wear is limited. For example, the in vitro wear rate for alumina femoral heads articulating against alumina acetabular cups (alumina-on-alumina) cannot currently be quantified via gravimetric measurement making quantitative estimates of long-term behavior in vivo problematic.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional laser micrometry characterization of surface wear in total hip arthroplasty

et al. 2007

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Even after decades of clinical use, our ability to quantify wear across total hip replacement implant surfaces is largely limited to single value measurements. The influence of patient factors on wear remains enigmatic. This pilot study for the development of three-dimensional laser micrometry (3DLM) introduces an easy, accurate means of 'mapping' and quantifying material removal. A three-dimensional laser micrometer was constructed using a laser micrometer having an accuracy of 0.5 microm. A 3D surface map is triangulated from a point cloud consisting of approximately 140,000 individual points. Comparison to a reference sphere determines radial wear over the entire surface. 3DLM was able to map and quantify fine scale surface features. Even for zirconia on relatively soft ultra-high molecular weight polyethylene, this technique maps the contributions of localized wear at the macroscopic level. The 0.5 microm (or greater) accuracy of these lasers allows us to image surfaces with a high degree of confidence. This analysis lends itself well to automation, and we anticipate that this advance will prove valuable in establishing that each head and cup combination emerging from a given clinical environment has unique wear patterns as observed in this trial data set.

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Retrieval of Ceramic Wear Couples in Total Hip Arthroplasty

Cited by 3 publications

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Bioceramics

Bioceramics

Alumina ceramics

Three‐dimensional laser micrometry characterization of surface wear in total hip arthroplasty

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