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https://www.readbyqxmd.com/read/28500998/the-impact-of-surface-and-geometry-on-coefficient-of-friction-of-artificial-hip-joints
#1
Dipankar Choudhury, Martin Vrbka, Azuddin Bin Mamat, Ian Stavness, Chanchal K Roy, Rajshree Mootanah, Ivan Krupka
Coefficient of friction (COF) tests were conducted on 28-mm and 36-mm-diameter hip joint prostheses for four different material combinations, with or without the presence of Ultra High Molecular Weight Polyethylene (UHMWPE) particles using a novel pendulum hip simulator. The effects of three micro dimpled arrays on femoral head against a polyethylene and a metallic cup were also investigated. Clearance played a vital role in the COF of ceramic on polyethylene and ceramic on ceramic artificial hip joints. Micro dimpled metallic femoral heads yielded higher COF against a polyethylene cup; however, with metal on metal prostheses the dimpled arrays significantly reduced the COF...
May 6, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28485507/the-effect-of-impact-assembly-on-the-interface-deformation-and-fretting-corrosion-of-modular-hip-tapers-an-in-vitro-study
#2
Anna Panagiotidou, Timothy Cobb, Jay Meswania, John Skinner, Alister Hart, Fares Haddad, Gordon Blunn
Wear and corrosion at the modular head-neck junction has been recognised to be a potential clinical concern, with multiple reports on adverse local tissue reactions and subsequent early failure of metal-on-metal hip replacements. Furthermore, reports on head-neck taper corrosion are also being described with conventional metal-on-polyethylene bearings. Manufacturing tolerances, surgical technique, non-axial alignment, material combination, high frictional torque and high bending moment have all been implicated in the failure process...
May 9, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28483210/metal-on-metal-compared-with-metal-on-polyethylene-the-effect-on-trunnion-corrosion-in-total-hip-arthroplasty
#3
Brent A Lanting, Matthew G Teeter, James L Howard, Steven J MacDonald, Douglas W Van Citters
BACKGROUND: Trunnion tribocorrosion in total hip arthroplasties is concerning, but retrieval studies often are subjective or lack comparison groups. Quantitative comparisons of clinically relevant implants are required. The purpose of this investigation was to evaluate material loss in metal-on-metal (MoM) and metal-on-polyethylene (MoP) total hip articulations while controlling for trunnion design and head size. METHODS: The 166 retrieved femoral heads from 2 manufacturers were analyzed...
March 29, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28482618/effects-of-carbon-addition-on-wear-mechanisms-of-cocrmo-metal-on-metal-hip-joint-bearings
#4
Yan Chen, Yunping Li, Yuichiro Koizumi, Hani Haider, Akihiko Chiba
The wear behaviors of biomedical CoCrMo prosthetic alloys containing various amounts of carbon were investigated using a standard hip joint simulator in a simulated body fluid. A few chunks and punctate σ-phase precipitates were observed in the low-carbon (LC) alloy; these were responsible for the abrasion and run-in wear. Increasing the carbon content led to greater precipitation of globular M23C6-type carbides. As a result, lower wear loss was observed in the high-carbon (HC) alloy. However, the Student's t-test analysis on wear loss indicated that there was no significant difference in wear loss between the LC-LC and HC-HC combinations...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28480531/characterization-of-wear-debris-from-metal-on-metal-hip-implants-during-normal-wear-versus-edge-loading-conditions
#5
Michael Kovochich, Ernest S Fung, Ellen Donovan, Kenneth M Unice, Dennis J Paustenbach, Brent L Finley
Advantages of second-generation metal-on-metal (MoM) hip implants include low volumetric wear rates and the release of nanosized wear particles that are chemically inert and readily cleared from local tissue. In some patients, edge loading conditions occur, which result in higher volumetric wear. The objective of this study was to characterize the size, morphology, and chemistry of wear particles released from MoM hip implants during normal (40° angle) and edge-loading (65° angle with microseparation) conditions...
May 8, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28461912/sequelae-of-large-head-metal-on-metal-hip-arthroplasties-current-status-and-future-prospects
#6
REVIEW
Christiaan P van Lingen, Luigi M Zagra, Harmen B Ettema, Cees C Verheyen
Large-head metal-on-metal (MoM) bearings were re-popularised in the late 1990s with the introduction of modern hip resurfacing (HR), followed closely by large metal head total hip arthroplasty (THA). A worldwide increase in the use of MoM hip arthroplasty subsequently saw a sharp decline, due to serious complications.MoM was rapidly adopted in the early 2000s until medical device alerts were issued by government regulatory agencies and national and international organisations, leading to post-marketing surveillance and discontinuation of these implants...
October 2016: EFORT Open Rev
https://www.readbyqxmd.com/read/28456333/how-symmetric-are-metal-on-metal-hip-resurfacing-patients-during-gait-insights-for-the-rehabilitation
#7
Renan A Resende, Renata N Kirkwood, John F Rudan, Kevin J Deluzio
Metal-on-metal hip resurfacing patients demonstrate hip biomechanics closer to normal in comparison to total hip arthroplasty during gait. However, it is not clear how symmetric is the gait of hip resurfacing patients. Biomechanical data of 12 unilateral metal-on-metal hip resurfacing participants were collected during gait at a mean time of 45months (SD 24) after surgery. Ankle, knee, hip, pelvis and trunk kinematics and kinetics of both sides were measured with a motion and force-capture system. Principal component analysis and mean hypothesis' tests were used to compare the operated and healthy sides...
April 19, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28455467/risk-factors-for-failure-of-the-36-mm-metal-on-metal-pinnacle-total-hip-arthroplasty-system-a-retrospective-single-centre-cohort-study
#8
G S Matharu, R S Nandra, F Berryman, A Judge, P B Pynsent, D J Dunlop
AIMS: To determine ten-year failure rates following 36 mm metal-on-metal (MoM) Pinnacle total hip arthroplasty (THA), and identify predictors of failure. PATIENTS AND METHODS: We retrospectively assessed a single-centre cohort of 569 primary 36 mm MoM Pinnacle THAs (all Corail stems) followed up since 2012 according to Medicines and Healthcare Products Regulation Agency recommendations. All-cause failure rates (all-cause revision, and non-revised cross-sectional imaging failures) were calculated, with predictors for failure identified using multivariable Cox regression...
May 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28449848/adverse-local-tissue-responses-to-failed-temporomandibular-joint-implants
#9
Louis G Mercuri, Robert M Urban, Deborah J Hall, Mathew T Mathew
PURPOSE: The purpose of this study was to determine whether failed alloplastic temporomandibular joint replacement (TMJR) devices can elicit the aseptic lymphocyte-dominated vasculitis-associated lesion (ALVAL) reaction seen in some patients with metal-on-metal hip arthroplasties. MATERIALS AND METHODS: This study involved analysis of paraffin-embedded sections of peri-implant tissue from failed TMJ implant cases obtained from 3 independent sources. Hematoxylin and eosin staining, conventional and polarized light microscopy, back-scattered electron imaging, and energy-dispersive x-ray analysis were used...
April 1, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28419029/females-with-unexplained-joint-pain-following-total-joint-arthroplasty-exhibit-a-higher-rate-and-severity-of-hypersensitivity-to-implant-metals-compared-with-males-implications-of-sex-based-bioreactivity-differences
#10
Marco S Caicedo, Edward Solver, Latasha Coleman, Joshua J Jacobs, Nadim J Hallab
BACKGROUND: Recent studies indicate that females demonstrate an increased risk of experiencing adverse local tissue reactions, aseptic loosening, and revision after primary metal-on-metal hip resurfacing arthroplasty compared with males; the underlying biological mechanisms responsible for sex discrepancies in implant failure remain unclear. In addition to anatomical and biomechanical sex differences, there may be inherent immunological disparities that predispose females to more aggressive adaptive immune reactivity to implant debris, i...
April 19, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28418575/effects-of-previous-osteotomy-on-outcome-of-hip-resurfacing-arthroplasty
#11
Harlan Cabot Amstutz, Michel Jean Le Duff
The effect of previous conservative surgeries on the outcome of metal-on-metal hip resurfacing arthroplasty (HRA) has not been studied. This study compared postoperative clinical scores and survivorship results of hips with and without previous osteotomies in a population of patients who underwent HRA. A total of 1101 patients (1375 hips) with a mean age of 51.3 years at the time of surgery underwent HRA at a single center. Sixty-nine patients had undergone prior surgery on the operated hip including 14 osteotomies (1 pelvic, 6 femoral, and 7 combined pelvic and femoral osteotomies)...
April 18, 2017: Orthopedics
https://www.readbyqxmd.com/read/28416253/mechanical-stability-of-the-taper-connection-of-large-metal-femoral-heads-with-adapter-sleeves-in-total-hip-arthroplasty-analyzed-using-explicit-finite-element-simulations
#12
Danny Vogel, Adrian Falkenberg, Sarah Bierbaum, Christian Schulze, Rainer Bader, Daniel Kluess
BACKGROUND: Large diameter heads (LDHs) of metal-on-metal bearings in total hip arthroplasty provide increased range of motion and reduced dislocation rates. However, major concerns grew over high wear rates from the modular connection between femoral stem and head, especially in combination with adapter sleeves. METHODS: A computational study on the taper connection stability of LDH (50 mm) with adapter sleeves of different lengths (S, M, L, and XL) compared with a standard femoral head (32 mm) without adapter sleeves was conducted using explicit finite element analyses...
March 22, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28415428/the-effect-of-sliding-onto-the-metal-electrolyte-interface-studying-model-parameter-modifications-by-means-of-eis
#13
Josianne Cassar, Bertram Mallia, Andreas Karl, Joseph Buhagiar
Several problems are associated with corrosion-wear occurring on metal-on-metal hip implants made out of cobalt-chromium based alloys. Low temperature carburizing, a process that creates a hard and corrosion resistant diffused layer in Cobalt-Chromium-Molybdenum (CoCrMo) alloys, known as S-phase, may be a possible solution towards mitigating these problems. In this work, static- and tribo-corrosion testing involving an alumina versus CoCrMo (untreated and carburized) were conducted in Ringer's solution. Electrochemical impedance spectroscopy was used to compare impedance plots attained before and after sliding so as to understand how the metal-electrolyte interface is affected by rubbing...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28393608/comparative-study-of-material-loss-at-the-taper-interface-in-retrieved-metal-on-polyethylene-and-metal-on-metal-femoral-components-from-a-single-manufacturer
#14
Paul Bills, Radu Racasan, Saugatta Bhattacharya, Liam Blunt, Graham Isaac
There have been a number of reports on the occurrence of taper corrosion and/or fretting and some have speculated on a link to the occurrence of adverse local tissue reaction specifically in relation to total hip replacement which have a metal-on-metal bearing. As such a study was carried out to compare the magnitude of material loss at the taper in a series of retrieved femoral heads used in metal-on-polyethylene bearings with that in a series of retrieved heads used in metal-on-metal bearings. A total of 36 metal-on-polyethylene and 21 metal-on-metal femoral components were included in the study all of which were received from a customer complaint database...
April 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28375892/metal-artifact-reduction-sequence-mri-abnormalities-in-asymptomatic-patients-with-a-ceramic-on-polyethylene-total-hip-replacement
#15
Jason M Jennings, J Ryan Martin, Raymond H Kim, Charlie C Yang, Todd M Miner, Douglas A Dennis
BACKGROUND: Magnetic resonance imaging (MRI) is a commonly utilized screening modality in patients with a metal-on-metal (MoM) total hip replacement. The prevalence of clinically important fluid collections may be overestimated since these collections have been reported to occur in asymptomatic patients with MoM and other bearing surfaces. The purpose of this study was to determine the frequency and types of MRI-documented adverse local tissue reactions in asymptomatic patients with a ceramic-on-polyethylene (CoP) total hip replacement...
April 5, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28373980/clinical-results-and-serum-metal-ion-concentrations-following-ceramic-on-metal-total-hip-arthroplasty-at-a-mean-follow-up-of-60-months
#16
W Maurer-Ertl, D Pranckh-Matzke, J Friesenbichler, G Bratschitsch, L A Holzer, M Maier, A Leithner
Background. Increased metal ion levels following total hip arthroplasty (THA) with metal-on-metal bearings are a highly debated topic. Local soft tissue reactions with chronic pain and systemic side effects such as neuropathy are described. The aim of the current study was to determine the serum metal ion concentrations of Cobalt (Co) and Chrome (Cr) after THA with a ceramic-on-metal (CoM) bearing. Patients and Methods. Between 2008 and 2010, 20 patients underwent THA using a CoM bearing. Clinical function was evaluated by standardized scores systems (Harris Hip Score and WOMAC Score) and radiological examination included X-rays...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28363892/mid-term-changes-in-blood-metal-ion-levels-after-articular-surface-replacement-arthroplasty-of-the-hip
#17
MULTICENTER STUDY
V P Galea, I Laaksonen, S J Matuszak, J W Connelly, O Muratoglu, H Malchau
AIMS: Our first aim was to determine whether there are significant changes in the level of metal ions in the blood at mid-term follow-up, in patients with an Articular Surface Replacement (ASR) arthroplasty. Secondly, we sought to identify risk factors for any increases. PATIENTS AND METHODS: The study involved 435 patients who underwent unilateral, metal-on-metal (MoM) hip resurfacing (HRA) or total hip arthroplasty (THA). These patients all had one measurement of the level of metal ions in the blood before seven years had passed post-operatively (early evaluation) and one after seven years had passed post-operatively (mid-term evaluation)...
April 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28362050/clinical-and-radiographic-outcomes-of-the-birmingham-hip-resurfacing-arthroplasty-at-a-minimum-follow-up-of-10-years-results-from-an-independent-centre
#18
Antonio Moroni, Maria Teresa Miscione, Riccardo Orsini, Giovanni Micera, Salvatore Mosca, Fabrizio Sinapi, Laura De Girolamo, Giuseppe Banfi
BACKGROUND: Metal-on-metal hip resurfacing (MoMHR) has been proposed as an effective surgical treatment for young and active patients with symptomatic hip disease. Recently, good clinical and radiographic outcomes have been reported by the designer surgeons at a 15.3 years follow-up; however, results at long follow-up by non-designer surgeons are less satisfactory. The aim of the study was to investigate if MoMHR can produce satisfactory clinical and radiographic results and if survival rate can be high even if the procedure is performed by non-designer surgeons...
March 21, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28361022/hip-resurfacing-arthroplasty-complicated-by-mismatched-implant-components
#19
Alessandro Calistri, Patricia Campbell, Catherine Van Der Straeten, Koen Aimè De Smet
Metal-on-metal hip resurfacing has gained popularity as a feasible treatment option for young and active patients with hip osteoarthritis and high functional expectations. This procedure should only be performed by surgeons who have trained specifically in this technique. Preoperative planning is essential for hip resurfacing in order to execute a successful operation and preview any technical problems. The authors present a case of a man who underwent a resurfacing arthroplasty for osteoarthritis of the left hip that was complicated by mismatched implant components that were revised three days afterwards for severe pain and leg length discrepancy...
March 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28343829/corrigendum-to-metal-on-metal-or-ceramic-on-ceramic-for-cementless-total-hip-arthroplasty-a-meta-analysis-the-journal-of-arthroplasty-31-2016-2637-2645
#20
Young-Kyun Lee, Byung-Ho Yoon, Yun Seong Choi, Woo-Lam Jo, Yong-Chan Ha, Kyung-Hoi Koo
No abstract text is available yet for this article.
March 23, 2017: Journal of Arthroplasty
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