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Keywords: implants
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eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2010
ISBN: 978-0-8031-7501-3
... device implants Deborah Tolomeo, Ph.D.1 Reprinted from JAI, Vol. 6, No. 10 doi:10.1520/JAI102204 Available online at www.astm.org/JAI Active Surveillance Systems for Early Detection and Improved Recall Decision Making* ABSTRACT: Medical device recalls have received signi cant publicity regarding...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2003
ISBN-10: 0-8031-3459-2
ISBN: 978-0-8031-3459-1
... Since MRI (magnetic resonance imaging) scanners became available in the 1980's, they have rapidly become one of the most common clinical imaging tools. The MR environment produces unique safety and compatibility issues for materials used in implants and medical devices. The principal issues...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1999
ISBN-10: 0-8031-2608-5
ISBN: 978-0-8031-2608-4
... The medical implant market's requirement for a forged version of the normally cast only, high carbon (approximately 0.2%) variant of the Co-Cr-Mo alloy, which would combine increased wear resistance with the mechanical properties of the low carbon (approximately 0.05%) variant of Co-Cr-Mo...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1998
ISBN-10: 0-8031-2482-1
ISBN: 978-0-8031-2482-0
... Oxygen-containing chemical species may cause an artificially high level of measured oxidation in the infrared (IR) analysis of clinically retrieved or hip wear simulator tested ultra-high molecular weight polyethylene (UHMWPE) implants. Esterified fatty acids from the synovial fluid or calf...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1997
ISBN-10: 0-8031-2415-5
ISBN: 978-0-8031-2415-8
... Flexibility in sizing, lower inventory requirements, and the ability to choose materials with optimum physical properties for each component have made modular hip implants the design of choice for most orthopedic surgeons. However, the presence of surface asperities and angular mismatch between...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1993
ISBN-10: 0-8031-1852-X
ISBN: 978-0-8031-1852-2
... of the metallic controls. The collarless, straight stems had a canal-filling design developed expressly for dogs. The prostheses were uncoated, with a relatively smooth surface, and were implanted with a press-fit. Computed tomography (CT) was used to quantify the remodeling of bone around the implants...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
... The spectrum of effects leading to the bone loss observed around failing implants is explained by means of a wear-debris-activated, macrophagic osteolytic mechanism. This concept is presented as the universal failure mechanism for all arthroplasty components, irrespective of fixation mode...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
... clinical and experimental research on the biology of aseptic loosening of joint arthroplasties and discusses the important role of particulate polymeric debris. particulates implants biomaterials polymethyl methacrylate polyethylene particles prosthetic loosening arthroplasty Stuart B...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
... was confined to localized areas adjacent to the cement membrane. The results of this study suggest that histiocytes activated by the ingestion of fine wear debris are responsible for bone loss. The mechanism of bone loss shown by this “model” is applicable to all joint replacement implant systems where wear...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
... osteolysis appears to be mediated by histiocytes containing both metallic and polymeric wear debris. particulates implants osteolysis wear titanium polyethylene total hip replacement J. J. Jacobs, 1 R. M. Urba/l, 1 F. Schajowicz, 1 J. Gavri[ovic, 2 a n d J. O. Galantel Particulate-Associated...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
... for the osteolysis around uncemented porous-coated femoral components is not known. However, it seems that particulate debris from implanted biomaterials, such as metal and or polyethylene, seems to play an important role in the production of osteolysis around prosthetic components. The debris is much smaller...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
... Wear debris is produced by both the gross and microscopic motion between all implant, bone, and cement interfaces in prosthetic arthroplasty. It has been hypothesized that this debris elicits an inflammatory biological reaction, resulting in bone loss, implant loosening, and subsequent...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
... Four patients with a single-design metal-backed patellar component underwent revision of patellar components of both knees. In each case, a markedly symptomatic side and a mildly symptomatic side were present. Implant retrieval analysis allowed the authors to confirm a mechanism of implant...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
... Profile imaging can be used to image the articulation of the patellofemoral joint of total knee implants. Using undamaged implants, conformity of the two articulating surfaces could be traced at angles of 50, 70, 90, and 120° of knee flexion. This was applied to five different styles of implants...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
... Implantation of an orthopedic device into or onto bone induces the formation of an interface membrane separating the one from the other. The histological reaction patterns described herein are those occurring in the interface membranes of a cemented arthroplasty, cementless isoelastic...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
... relatively large and could not undergo phagocytosis; these particles did not stimulate increased PGE 2 production in comparison with bulk implants. Specimens from Group 2 produced 72.15 ± 13.60 ng PGE 2 on the right side and 67.53 ± 16.59 ng PGE 2 on the left side (NS). Specimens from Group 3 produced...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
... Evaluation of the biocompatibility of particulate debris is of paramount importance in improving the long-term results of joint replacement arthroplasty. This paper compares the results of intramuscular implants of particulates with the results of injection of particulates in the rat...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
.... The authors used this model to investigate the differences in biological response to polymethyl methacrylate with and without barium sulfate, and found that the presence of barium sulfate led to a markedly increased inflammatory reaction. particulates implants biocompatibility polymethyl methacrylate...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
... lysis at the bone/implant interface after noncemented total hip replacement. particulates implants biomaterials macrophage fibroblasts Steven R. Goldring, 1 Norman E. Bennett, 2 Murali J. Jasty, 3 and Jeng-Tzung Wang4 In Vitro Activation of Monocyte Macrophages and Fibroblasts by Metal...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1441-9
ISBN: 978-0-8031-1441-8
.... There were no differences in IL-1 levels between the fabricated and retrieved bone cement particles. In this cell culture system, fibroblasts seem to be potent producers of PGE 2 secretion, regardless of the shape or size of the particles. particulates implants wear particles bone cement clinical...