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• W2103276441 abstract "Cylindrical porous-coated implants were placed in the distal femoral metaphyses of twenty dogs and were subjected to zero, twenty, forty, or 150 micrometers of oscillatory motion for eight hours each day for six weeks with use of a specially designed loading apparatus. The in vivo skeletal responses to the different magnitudes of relative motion were evaluated.Histological analysis demonstrated growth of bone into the porous coatings of all of the implants, including those that had been subjected to 150 micrometers of motion. However, the ingrown bone was in continuity with the surrounding bone only in the groups of implants that had not been subjected to motion or that had been subjected to twenty micrometers of motion; in contrast, the implants that had been subjected to forty micrometers of motion were surrounded in part by trabecular bone but also in part by fibrocartilage and fibrous tissue, and those that had been subjected to 150 micrometers of motion were surrounded by dense fibrous tissue. Trabecular microfractures were identified around three of the five implants that had been subjected to forty micrometers of motion and around four of the five that had been subjected to 150 micrometers of motion, suggesting that the ingrown bone had failed at the interface because of the large movements.The architecture of the surrounding trabecular bone also was altered by the micromotion of the implant. The implants that had stable ingrowth of bone were surrounded by a zone of trabecular atrophy, whereas those that had unstable ingrowth of bone were surrounded by a zone of trabecular hypertrophy. The trabeculae surrounding the fibrocartilage or fibrous tissue that had formed around the implants that had been subjected to forty or 150 micrometers of motion had been organized into a shell of dense bone tangential to the implant (that is, a neocortex outside the non-osseous tissue).CLINICAL RELEVANCE: The findings of the present study quantitate the in vivo patterns of bone ingrowth and remodeling that occur in association with different magnitudes of micromovement of porous-coated implants. Small movements (zero and twenty micrometers) are compatible with stable ingrowth of bone and atrophy of the surrounding trabecular bone, whereas larger movements (forty and 150 micrometers) result in less stable or unstable ingrowth of bone, the formation of fibrocartilage or fibrous tissue around the implant, and hypertrophy of the surrounding trabecular bone. This study not only quantified the magnitudes of relative micromotion that cause these different skeletal responses but also may help in the interpretation of radiographs of patients who have a porous-coated prosthesis." @default.
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• W2103276441 date "1997-05-01" @default.
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• W2103276441 title "In Vivo Skeletal Responses to Porous-Surfaced Implants Subjected to Small Induced Motions*" @default.
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• W2103276441 doi "https://doi.org/10.2106/00004623-199705000-00010" @default.
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