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Hip joint tribology

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https://www.readbyqxmd.com/read/28941162/an-in-vitro-simulation-model-to-assess-the-severity-of-edge-loading-and-wear-due-to-variations-in-component-positioning-in-hip-joint-replacements
#1
O O'Dwyer Lancaster-Jones, S Williams, L M Jennings, J Thompson, G H Isaac, J Fisher, M Al-Hajjar
The aim of this study was to develop a preclinical in vitro method to predict the occurrence and severity of edge loading condition associated with the dynamic separation of the centres of the head and cup (in the absence of impingement) for variations in surgical positioning of the cup. Specifically, this study investigated the effect of both the variations in the medial-lateral translational mismatch between the centres of the femoral head and acetabular cup and the variations in the cup inclination angles on the occurrence and magnitude of the dynamic separation, the severity of edge loading, and the wear rate of ceramic-on-ceramic hip replacement bearings in a multi-station hip joint simulator during a walking gait cycle...
September 23, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28886084/an-in-vitro-simulation-method-for-the-tribological-assessment-of-complete-natural-hip-joints
#2
Dawn Groves, John Fisher, Sophie Williams
The use of hip joint simulators to evaluate the tribological performance of total hip replacements is widely reported in the literature, however, in vitro simulation studies investigating the tribology of the natural hip joint are limited with heterogeneous methodologies reported. An in vitro simulation system for the complete natural hip joint, enabling the acetabulum and femoral head to be positioned with different orientations whilst maintaining the correct joint centre of rotation, was successfully developed for this study...
2017: PloS One
https://www.readbyqxmd.com/read/28773112/corrosion-and-tribology-of-materials-used-in-a-novel-reverse-hip-replacement
#3
Linda Braddon, Zafer Termanini, Steven MacDonald, Jay Parvizi, Jay Lieberman, Victor Frankel, Joseph Zuckerman
Total hip arthroplasty has been utilized for the past 50 years as an effective treatment for degenerative, inflammatory and traumatic disorders of the hip. The design of these implants has generally followed the anatomy of the hip as a ball and socket joint with the femoral head representing the ball and the acetabulum representing the socket. We describe a novel hip arthroplasty design in which the "ball" is located on the acetabular side and the "socket" is located on the femoral side. The results of extensive biomechanical testing are described and document wear and corrosion characteristics that are at least equivalent to standard designs...
July 5, 2017: Materials
https://www.readbyqxmd.com/read/28615939/effect-of-carbon-ion-implantation-on-the-tribology-of-metal-on-metal-bearings-for-artificial-joints
#4
Hironobu Koseki, Masato Tomita, Akihiko Yonekura, Takashi Higuchi, Sinya Sunagawa, Koumei Baba, Makoto Osaki
Metal-on-metal (MoM) bearings have become popular due to a major advantage over metal-on-polymer bearings for total hip arthroplasty in that the larger femoral head and hydrodynamic lubrication of the former reduce the rate of wear. However, concerns remain regarding adverse reactions to metal debris including metallosis caused by metal wear generated at the taper-head interface and another modular junction. Our group has hypothesized that carbon ion implantation (CII) may improve metal wear properties. The purpose of this study was to investigate the wear properties and friction coefficients of CII surfaces with an aim to ultimately apply these surfaces to MoM bearings in artificial joints...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28359859/raman-spectroscopy-of-biomedical-polyethylenes
#5
REVIEW
Giuseppe Pezzotti
With the development of three-dimensional Raman algorithms for local mapping of oxidation and plastic strain, and the ability to resolve molecular orientation patterns with microscopic spatial resolution, there is an opportunity to re-examine many of the foundations on which our understanding of biomedical grade ultra-high molecular weight polyethylenes (UHMWPEs) are based. By implementing polarized Raman spectroscopy into an automatized tool with an improved precision in non-destructively resolving Euler angles, oxidation levels, and microscopic strain, we become capable to make accurate and traceable measurements of the in vitro and in vivo tribological responses of a variety of commercially available UHMWPE bearings for artificial hip and knee joints...
March 27, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28332445/dynamic-virtual-simulation-of-the-occurrence-and-severity-of-edge-loading-in-hip-replacements-associated-with-variation-in-the-rotational-and-translational-surgical-position
#6
Joanna Leng, Mazen Al-Hajjar, Ruth Wilcox, Alison Jones, David Barton, John Fisher
Variation in the surgical positioning of total hip replacement can result in edge loading of the femoral head on the rim of the acetabular cup. Previous work has reported the effect of edge loading on the wear of hip replacement bearings with a fixed level of dynamic biomechanical hip separation. Variations in both rotational and translational surgical positioning of the hip joint replacement combine to influence both the biomechanics and the tribology including the severity of edge loading, the amount of dynamic separation, the force acting on the rim of the cup and the resultant wear and torque acting on the cup...
April 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28033151/spinal-realignment-for-adult-deformity-three-column-osteotomies-alter-total-hip-acetabular-component-positioning
#7
Jeffrey J Barry, Altug Yucekul, Alexander A Theologis, Erik N Hansen, Christopher Ames, Vedat Deviren
INTRODUCTION: A goal of adult spinal deformity surgery is correction of sagittal imbalance by increasing lumbar lordosis (LL), allowing a previously retroverted pelvis to normalize as evidenced by decreases in pelvic tilt (PT). Realignment of pelvic orientation may alter the position of preexisting total hip arthroplasties (THAs). METHODS: Twenty-seven patients with unilateral THA who underwent thoracolumbar fusions for adult spinal deformity from the pelvis to L1 or above were retrospectively reviewed (levels fused, 10...
February 2017: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/27736716/a-testing-protocol-combining-shocks-hydrothermal-ageing-and-friction-applied-to-zirconia-toughened-alumina-zta-hip-implants
#8
Armelle Perrichon, Bruno Reynard, Laurent Gremillard, Jérôme Chevalier, Frédéric Farizon, Jean Geringer
Ceramics are materials of choice for hip joint implants because of their excellent biocompatibility and mechanical properties. Wear of the bearing couple (femoral head and cup) remains one of the main concerns of hip implants. Although ceramics are known for their good tribological properties, shocks due to micro-separation, friction and hydrothermal ageing in physiological environment remain the three main sources of wear. It has been recently suggested that shock effects dominate but the three degradation mechanisms were so far simulated separately...
January 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27484072/-analysis-of-oxidative-damage-to-components-removed-from-beznoska-poldi-total-hip-replacements
#9
P Fulín, D Pokorný, M Šlouf, M Nevoralová, T Vacková, J Dybal, N Kaspříková, I Landor
UNLABELLED: PURPOSE OF THE STUDY Ultrahigh molecular weight polyethylene (UHMWPE) is today the most frequently used bearing surface in total joint replacements (TJR) because of its properties, i.e., excellent biocompatibility, good mechanical and tribological performance and high wear resistance. UHMWPE liners are the most loaded TJR components and, therefore, their properties are decisive for TJR longevity. This study had three objectives: 1) to evaluate the oxidative degradation of explanted UHMWPE components; 2) to look for a statistically significant relationship between the extent of oxidative degradation and the durability of joint replacements; and 3) to investigate whether the durability of a TJR was related to the type of sterilisation used in manufacture...
2016: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/27420572/lubrication-of-articular-cartilage
#10
REVIEW
Sabrina Jahn, Jasmine Seror, Jacob Klein
The major synovial joints such as hips and knees are uniquely efficient tribological systems, able to articulate over a wide range of shear rates with a friction coefficient between the sliding cartilage surfaces as low as 0.001 up to pressures of more than 100 atm. No human-made material can match this. The means by which such surfaces maintain their very low friction has been intensively studied for decades and has been attributed to fluid-film and boundary lubrication. Here, we focus especially on the latter: the reduction of friction by molecular layers at the sliding cartilage surfaces...
July 11, 2016: Annual Review of Biomedical Engineering
https://www.readbyqxmd.com/read/27409127/-scientific-assessment-of-350-failed-metasul-ldh%C3%A2-hip-prostheses-with-durom%C3%A2-acetabulum-component-with-probable-conus-insufficiency-implanted-in-a-single-centre-during-2003-to-2008
#11
D Brauers, M Rütschi, G Pagenstert
Introduction: The revision rates were high for patients with Metasul-LDH® hip prosthesis (LDH = large-diameter head) with DUROM® acetabulum components implanted in a single centre between 2003 and 2008. This suggested that there was a system-related weakness in total hip replacements with large diameter heads. It was suspected that the tapered connection between head and stem was responsible for the implantation failure. This led to a scientific reappraisal of the unsuccessful hip prostheses, in order to clarify whether there was a tribological problem or a cone failure...
October 2016: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/27160559/influence-of-hip-joint-simulator-design-and-mechanics-on-the-wear-and-creep-of-metal-on-polyethylene-bearings
#12
Murat Ali, Mazen Al-Hajjar, Susan Partridge, Sophie Williams, John Fisher, Louise M Jennings
Hip joint simulators are used extensively for preclinical testing of hip replacements. The variation in simulator design and test conditions used worldwide can affect the tribological performance of polyethylene. The aim of this study was to assess the effects of simulator mechanics and design on the wear and creep of ultra-high-molecular-weight polyethylene. In the first part of this study, an electromechanical simulator and pneumatic simulator were used to compare the wear and creep of metal-on-polyethylene components under the same standard gait conditions...
May 2016: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/26733644/the-jumbo-acetabular-component-for-acetabular-revision-curtain-calls-and-caveats
#13
REVIEW
P F Lachiewicz, T S Watters
The 'jumbo' acetabular component is now commonly used in acetabular revision surgery where there is extensive bone loss. It offers high surface contact, permits weight bearing over a large area of the pelvis, the need for bone grafting is reduced and it is usually possible to restore centre of rotation of the hip. Disadvantages of its use include a technique in which bone structure may not be restored, a risk of excessive posterior bone loss during reaming, an obligation to employ screw fixation, limited bone ingrowth with late failure and high hip centre, leading to increased risk of dislocation...
January 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/26733634/ceramic-on-ceramic-arthroplasty-of-the-hip-new-materials-confirm-appropriate-use-in-young-patients
#14
U Sentuerk, P von Roth, C Perka
The leading indication for revision total hip arthroplasty (THA) remains aseptic loosening owing to wear. The younger, more active patients currently undergoing THA present unprecedented demands on the bearings. Ceramic-on-ceramic (CoC) bearings have consistently shown the lowest rates of wear. The recent advances, especially involving alumina/zirconia composite ceramic, have led to substantial improvements and good results in vitro. Alumina/zirconia composite ceramics are extremely hard, scratch resistant and biocompatible...
January 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/26594781/towards-near-permanent-cocrmo-prosthesis-surface-by-combining-micro-texturing-and-low-temperature-plasma-carburising
#15
Yangchun Dong, Petr Svoboda, Martin Vrbka, David Kostal, Filip Urban, Jan Cizek, Pavla Roupcova, Hanshan Dong, Ivan Krupka, Martin Hartl
An advanced surface engineering process combining micro-texture with a plasma carburising process was produced on CoCrMo femoral head, and their tribological properties were evaluated by the cutting-edge pendulum hip joint simulator coupled with thin film colorimetric interferometry. FESEM and GDOES showed that precipitation-free C S-phase with a uniform case depth of 10μm was formed across the micro-textures after duplex treatment. Hip simulator tests showed that the friction coefficient was reduced by 20% for micro-metre sized texture, and the long-term tribological property of microtexture was enhanced by the C-supersaturated crystalline microstructure formed on the surface of duplex treated CoCrMo, thereby enhancing biotribological durability significantly...
March 2015: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/25967039/effect-of-aqueous-solution-and-load-on-the-formation-of-dlc-transfer-layer-against-co-cr-mo-for-joint-prosthesis
#16
Feifei Guo, Zhifeng Zhou, Meng Hua, Guangneng Dong
Diamond-like carbon (DLC) coating exhibits excellent mechanical properties such as high hardness, low friction and wear, which offer a promising solution for the metal-on-metal hip joint implants. In the study, the hydrogen-free DLC coating with the element Cr as the interlay addition was deposited on the surface of the Co-Cr-Mo alloy by a unbalanced magnetron sputtering method. The coating thickness was controlled as 2 µm. Nano-indentation test indicated the hardness was about 13 GPa. DLC coated Co-Cr-Mo alloy disc against un-coated Co-Cr-Mo alloy pin (spherical end SR9...
September 2015: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/25874400/-ceramic-on-ceramic-bearings-in-total-hip-arthroplasty-tha
#17
U Sentürk, C Perka
The main reason for total hip arthroplasty (THA) revision is the wear-related aseptic loosening. Younger and active patients after total joint replacement create high demands, in particular, on the bearings. The progress, especially for alumina ceramic-on-ceramic bearings and mixed ceramics have solved many problems of the past and lead to good in vitro results. Modern ceramics (alumina or mixed ceramics containing alumina) are extremely hard, scratch-resistant, biocompatible, offer a low coefficient of friction, superior lubrication and have the lowest wear rates in comparison to all other bearings in THA...
April 2015: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/25704181/a-novel-tribological-study-on-dlc-coated-micro-dimpled-orthopedics-implant-interface
#18
Dipankar Choudhury, Filip Urban, Martin Vrbka, Martin Hartl, Ivan Krupka
This study investigates a tribological performance of diamond like carbon (DLC) coated micro dimpled prosthesis heads against ceramic cups in a novel pendulum hip joint simulator. The simulator enables determining friction coefficient and viscous effects of a concave shaped specimen interface (conformal contact). Two types of DLC such as hydrogenated amorphous carbon (a-C:H) and tetrahedral amorphous carbon (Ta-C) and one set of micro dimple (diameter of 300µm, depth of 70µm, and pitch of 900µm) were fabricated on metallic prosthesis heads...
May 2015: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/25621213/biotribology-of-artificial-hip-joints
#19
REVIEW
Francesca Di Puccio, Lorenza Mattei
Hip arthroplasty can be considered one of the major successes of orthopedic surgery, with more than 350000 replacements performed every year in the United States with a constantly increasing rate. The main limitations to the lifespan of these devices are due to tribological aspects, in particular the wear of mating surfaces, which implies a loss of matter and modification of surface geometry. However, wear is a complex phenomenon, also involving lubrication and friction. The present paper deals with the tribological performance of hip implants and is organized in to three main sections...
January 18, 2015: World Journal of Orthopedics
https://www.readbyqxmd.com/read/25220737/fabrication-and-characterization-of-dlc-coated-microdimples-on-hip-prosthesis-heads
#20
Dipankar Choudhury, Hee Ay Ching, Azuddin Bin Mamat, Jan Cizek, Noor Azuan Abu Osman, Martin Vrbka, Martin Hartl, Ivan Krupka
Diamond like carbon (DLC) is applied as a thin film onto substrates to obtain desired surface properties such as increased hardness and corrosion resistance, and decreased friction and wear rate. Microdimple is an advanced surface modification technique enhancing the tribological performance. In this study, DLC coated microdimples were fabricated on hip prosthesis heads and their mechanical, material and surface properties were characterized. An Electro discharge machining (EDM) oriented microdrilling was utilized to fabricate a defined microdimple array (diameter of 300 µm, depth of 70 µm, and pitch of 900 µm) on stainless steel (SS) hip prosthesis heads...
July 2015: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
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