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osteolysis/zmęczenie

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A surface crosslinked UHMWPE stabilized by vitamin E with low wear and high fatigue strength.

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Wear particle-induced periprosthetic osteolysis has been a clinical problem driving the development of wear resistant ultrahigh molecular weight polyethylene (UHMWPE) for total joint replacement. Radiation crosslinking has been used to decrease wear through decreased plastic deformation; but

Aseptic loosening in total hip arthroplasty secondary to osteolysis induced by wear debris from titanium-alloy modular femoral heads.

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Since 1984, we have used components made of titanium alloy for total joint arthroplasty. Recently, two patients needed revision hip arthroplasty, approximately three years after the initial procedure, because of aseptic loosening secondary to severe osteolysis that had been induced by metallic

Fatigue fracture of the sacral bone associated with septic arthritis of the symphysis pubis.

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Fractures of the pubic rami are almost invariably associated with fractures of the posterior arch of the pelvic ring. Two women, aged 50 and 67 years, with septic arthritis of the symphysis pubis attended by severe low back pain, were followed with CT and MR imaging of the pelvis, as well as bond

Alendronate in bone cement: fatigue life degraded by liquid, not by powder.

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Bisphosphonates have the potential to reduce osteolysis, a phenomenon that has been postulated to play a key role in aseptic loosening of total joint replacements. Bisphosphonates may contribute to the in vivo longevity of total joint replacements. Some authors have suggested there are decreases in
High Crosslink process was introduced in the development of joint prosthetic devices, in order to decrease the wear rate of ultrahigh molecular weight polyethylene (UHMWPE), but it also triggers the formation of free radicals and oxidative stress, which affects the physiological bone remodeling,

UHMWPE and vitamin E bioactivity: an emerging perspective.

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Ultra-high molecular weight polyethylene (UHMWPE) is a semicrystalline biomaterial widely used in the components for articular prosthesis for its excellent mechanical qualities. Two major problems limit the UHMWPE prosthesis life-wearing and delamination, both phenomena being mainly due to chemical

Extraction and characterization of metallic wear debris from total joint arthroplasty.

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Wear debris generated from total joint arthroplasty may elicit a granulomatous and inflammatory response and has also been implicated in the development of osteolysis. Technical difficulty in retrieval and isolation of wear material from tissues has hindered the study of their physicochemical

Minimum five-year wear rate of metal-on-highly cross-linked polyethylene in primary total hip arthroplasty.

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OBJECTIVE Highly cross-linked polyethylenes (PE) have been developed with encouraging results in terms of wear. Another body of the literature has indicated potential catastrophic failures related to reduced fatigue properties and oxidation. Each PE available on the market has its own processing

The microenvironment around total hip replacement prostheses.

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The metal stem of the totally replaced hip carries load and resists fatigue, but it is electrochemically corroded. Metallic atoms act as haptens, induce type 1 T-helper cells/Th1-type immune responses and enhance periprosthetic osteolysis. Stiff metal implants, which do not have the same elasticity
Ultra high-molecular weight polyethylene (UHMWPE) remains the most commonly used material in modern joint replacement prostheses. However, UHMWPE wear particles, formed as the bearing articulates, are one of the main factors leading to joint replacement failure via the induction of osteolysis and
BACKGROUND Management of extensive proximal femur bone loss secondary to tumor resection or major osteolysis remains controversial. The possible options include a composite allograft/stem prosthesis, a modular type megaprosthesis or a custom-made megaprosthesis. Modularity allows versatility at

Vitamin E-stabilized UHMWPE for total joint implants: a review.

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BACKGROUND Osteolysis due to wear of UHMWPE limits the longevity of joint arthroplasty. Oxidative degradation of UHMWPE gamma-sterilized in air increases its wear while decreasing mechanical strength. Vitamin E stabilization of UHMWPE was proposed to improve oxidation resistance while maintaining

Impingement of metal-polyethylene hip prostheses : Potential cause of high systemic titanium levels?

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High blood metal levels have been described in the past, primarily in metal-on-metal bearings. Other possible causes are often underestimated. This report presents the case of a 70-year-old female patient who suffered from pronounced neurological symptoms (especially fatigue and concentration

Vitamin E diffused, highly crosslinked UHMWPE: a review.

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Highly crosslinked UHMWPE has become the bearing surface of choice in total hip arthroplasty. First generation crosslinked UHMWPEs, clinically introduced in the 1990s, show significant improvements compared to gamma sterilised, conventional UHMWPE in decreasing wear and osteolysis. These crosslinked
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