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Title of Journal: International Orthopaedics SICOT

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Abbravation: International Orthopaedics

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Springer-Verlag

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DOI

10.1007/s10930-010-9262-4

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1432-5195

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Osseointegration in hip prostheses experimental s

Authors: C Doria V De Santis G Falcone L Proietti E De Santis
Publish Date: 2003/06/17
Volume: 27, Issue: 5, Pages: 272-277
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Abstract

Sixteen 2 to 3yearold sheep were submitted to a hemiarthroplasty of the hip joint with a specially designed femoral component The proximal two thirds of the stem had a circumferential plasmasprayed porous coating with hydroxyapatite The animals where killed a 15 30 60 90 120 180 200 270 360 and 540 days after surgery Femurs were submitted to plain radiographs computerised tomography CT scan and dual energy Xray absorptiometry DEXA Crosssections were obtained at four different levels and studied using scanning electron microscopy In the coated portion of the stem apposition of woven immature bone was evident at 15–30 days and mature lamellar bone by 30 days With time the gap between the endosteum and the coated surface was filled by bridges of lamellar bone with a marked trabecular orientation In the distal uncoated portion of the stem the implant was initially surrounded by fibrous tissue that with time transformed into lamellar boneSeize moutons de 2–3 ans ont subis une hémiarthroplastie de la hanche avec un composant fémoral spécialement conçu Les 2/3 proximaux de la tige avaient une couche poreuse circonférentielle de plasma vaporisé avec hydroxyapatite Les animaux ont été sacrifiés aux jours 15 30 60 90 120 180 200 270 360 et 540 après chirurgie Les fémurs ont été soumis à des radiographies ordinaires une tomodensitométrie une analyse DEXA Des sections ont été obtenues à quatre niveaux différents et étudiées en utilisant la microscopie électronique Dans la portion recouverte de la tige la présence dos immature était évidente à 15–30 jours et celle dos lamellaire mature à 30 jours Avec le temps lintervalle entre lendoste et la surface couverte a été rempli par des ponts dos lamellaire dune orientation trabeculaire marquée Dans la portion distale non couverte de la tige limplant a été initialement entouré par un tissu fibreux qui avec le temps sest transformé en os lamellaire

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