Calcium phosphate particles are found at the polyethylene insert surface whether implanted with HA-coated devices or not. A SEM-EPMA study

Frayssinet, Patrick; Gineste, Laurent; Bonel, G.; Rouquet, Nicole

doi:10.1016/b978-008042692-1/50034-0

Cited by 3 publications

(5 citation statements)

References 3 publications

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“…Crystallization of calcium phosphate might occur from a pathological condition or as a response to the high saturation of calcium and phosphate ions from a HAp‐coated component. Frayssinet et al40 found HAp particles impregnated into polyethylene inserts of cups in patients that had nonhydroxyapatite‐coated prostheses.…”

Section: Discussionmentioning

confidence: 99%

The contribution of coating microstructure to degradation and particle release in hydroxyapatite coated prostheses

Gross

Røkkum

2002

J. Biomed. Mater. Res.

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Plasma-sprayed coatings of hydroxyapatite powder are widely used on hip replacements. Commercially, they are supplied by a large number of companies and thus offer different coating design philosophies. This study focuses on a retrieved prosthetic stem that exhibited coating loss on the femoral stem occurring concurrently with third-body wear. The purpose of the research was to establish possible links between the coating microstructure and the clinical findings. A coated stem and cup were sectioned and the cross section was prepared to reveal the coating microstructure. Characterization included X-ray diffraction, FTIR spectroscopy, and crystalline particle quantification within the coating. It was found that the coating has a high amorphous content that provides fast resorption. The amount of crystalline particles increased on the distal location of the stem, the threads of the acetabular shell, and was generally higher on the cup. Accelerated degradation illustrated how the coating may be a particle-generating source by preferential dissolution of the amorphous phase, possibly allowing liberation of crystalline areas and other particulates at the substrate-coating interface. Such particles mainly include the less soluble hydroxyapatide formed from unmelted particles in the plasma or recrystallisation in the coating, but may also include entrapped grit lodged in the substrate during the roughening process. This study accents the importance of coating microstructure in understanding coating resorption.

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Section: Discussionmentioning

confidence: 99%

The contribution of coating microstructure to degradation and particle release in hydroxyapatite coated prostheses

Gross

Røkkum

2002

J. Biomed. Mater. Res.

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“…Failure of the coating-implant interface, which might result in coating delamination and eventually production of particles contributing to the third body wear process, is both a risk and concern of HA coatings 9,21,22,43,101,119,200,201,378 . Currently, HA coatings are clinically available on prostheses with either a grit-blasted, rough or porous substrate surface.…”

Section: Effects Of Surface Texture On Implant Fixationmentioning

confidence: 99%

“…Despite the general belief that resorption is necessary for bone bonding to occur, it has been proposed that resorption reduces the bonding strength between implant and substrate and disintegrates the coating. This could lead to delamination and failure of implant fixation and to acceleration of the third body wear process 9,21,22,43,101,119,200,201,378 . Early studies showed no resorption of HA whereas recent reports have demonstrated that resorption does occur.…”

Section: Factors With Influence On Loss Of Calcium Phosphate Coatingsmentioning

confidence: 99%

Calcium phosphate coatings for fixation of bone implants. Evaluated mechanically and histologically by stereological methods

Overgaard¹

2001

Acta Orthopaedica Scandinavica

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“…1-3 PE wear and debris have been shown to be responsible for the initiation of loosening of cemented non-metal-backed acetabular components and pelvic osteolysis at the periphery of uncemented metal-backed ones. 4 -6 The association of PE wear with undesirable tissue reactions affecting THA longevity has influenced the research in studying in vivo PE wear by means of retrieval analyses of acetabular components explanted at revision surgery [7][8][9][10][11][12][13][14][15][16][17][18] or at autopsy. 5,18 -20 This approach has had an important impact on understanding the conditions under which PE acetabular prostheses function, elucidating the mechanisms involved in PE wear.…”

Section: Introductionmentioning

confidence: 99%

“…These studies were aimed at the assessment of the morphological and compositional alterations of articular surfaces and employed techniques such as light microscopy, 5,9,11,15,17,19 electron microscopy, 5,9,10 -12,14,18 -20 and elemental identification by X-ray microanalysis. 11,13,15,16 Wear patterns such as polishing, scratching, pitting, cratering, folding, shredding, burnishing, cracking, and embedding of foreign particles were the primary morphological features identified. The elemental analysis revealed the presence of calcium, phosphorus, chlorine, sulfur, silicon, barium, titanium, iron, nickel, chromium, and cobalt that were present on the articular surfaces from the interaction of PE components with the metallic femoral heads and the biological environment.…”

Section: Introductionmentioning

confidence: 99%

Multitechnique characterization of articular surfaces of retrieved ultrahigh molecular weight polyethylene acetabular sockets

Magnissalis¹,

Εliades²,

Eliades³

1999

J. Biomed. Mater. Res.

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The articular surfaces of 10 retrieved ultrahigh molecular weight polyethylene acetabular sockets were studied by optical microscopy, X-ray fluorescence spectrometry, multiple internal reflectance FTIR spectroscopy, scanning electron microscopy, and wavelength dispersive X-ray microanalysis. The results revealed characteristic wear patterns including polishing, scratching, pitting, cratering, folding, shredding, burnishing, cracking, embedding of particles, and development of acquired biofilms with various degrees of mineralization. The biofilms formed were mainly of proteinaceous origin, and mineralized regions were composed of calcium phosphates with carbonate impurities. The crystallinity of the polyethylene at the articular surfaces was enhanced compared to the bulk, which was possibly due to the cold work produced in vivo. The mineralized regions were classified into two groups based on the grey levels of the backscattered images obtained. The high-contrast regions that were mainly composed of Ca and P with traces of Al and Si were associated with bone fragments; the low-contrast regions composed of K, Na, Ca, Mg, Si, Al, Fe, Cl, and P were associated with acquired biofilm calcification, which implies the active engagement of biofilms in the long term performance of acetabular sockets in vivo.

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Calcium phosphate particles are found at the polyethylene insert surface whether implanted with HA-coated devices or not. A SEM-EPMA study

Cited by 3 publications

References 3 publications

The contribution of coating microstructure to degradation and particle release in hydroxyapatite coated prostheses

The contribution of coating microstructure to degradation and particle release in hydroxyapatite coated prostheses

Calcium phosphate coatings for fixation of bone implants. Evaluated mechanically and histologically by stereological methods

Multitechnique characterization of articular surfaces of retrieved ultrahigh molecular weight polyethylene acetabular sockets

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