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https://www.readbyqxmd.com/read/27919579/alumina-delta-on-alumina-delta-bearing-in-cementless-total-hip-arthroplasty-in-patients-aged-50-years
#1
Young-Hoo Kim, Jang-Won Park, Jun-Shik Kim
BACKGROUND: There are limited studies to evaluate long-term clinical and radiographic outcomes of alumina delta ceramic-on-ceramic bearings in cementless total hip arthroplasty (THA). The purpose of this study was to evaluate the clinical and radiographic results, prevalence of osteolysis, squeaking, and fracture of ceramic material associated with the use of the alumina delta ceramic-on-alumina delta ceramic bearing in cementless THA in patients aged <50 years. METHODS: We reviewed the cases of 277 patients (334 hips) who underwent a cementless THA using alumina delta ceramic-on-alumina delta ceramic when they were 50 years or younger at the time of surgery...
December 2, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27912168/tensor-resolved-raman-spectroscopic-analysis-of-wear-induced-residual-stress-fields-in-long-term-alumina-hip-joint-retrievals
#2
Wenliang Zhu, Elia Marin, Nobuhiko Sugano, Giuseppe Pezzotti
Polarized Raman spectroscopy was applied to evaluate the full set of stress tensor components in the wear-induced residual stress fields on two long-term (>20 y) (monolithic) alumina (Al2O3) femoral head retrievals coupled to polyethylene liners. The tensor-resolved residual stress state stored onto the Al2O3 ceramic head surface was found to retain "memory" of the sliding conditions in vivo and of the wear-induced consumption of the polyethylene counterpart. The evolution of tensor-resolved residual stress motifs in the three-dimensional space was examined, and key features, including exceptionally high shear stresses in one case, were uncovered...
November 20, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27911456/mid-term-results-of-recap-magnum-taperloc-metal-on-metal-total-hip-arthroplasty-with-mean-follow-up-of-7-1-years
#3
Antonios A Koutalos, Aristotelis Kourtis, Ian C Clarke, Evert J Smith
INTRODUCTION: Despite enthusiasm for metal-on-metal bearings, disappointing short- to mid-term outcomes has all but halted the use of this bearing articulation. This review presents mid-term results for the ReCap Magnum total hip replacement. PATIENTS AND METHODS: This prospective study evaluated 79 ReCap/Magnum/Taperloc total hip replacements with mean follow-up of 7.1 (range 3.7-9.2) years. 43 were female and 36 male. Metal ions were measured and radiographic measurement included a 'margin of safety' angle to quantify risk of edge loading...
December 2, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27910817/on-the-molecular-interaction-between-femoral-heads-and-polyethylene-liners-in-artificial-hip-joints-phenomenology-and-molecular-scale-phenomena
#4
Giuseppe Pezzotti, B Sonny Bal, Elisa Casagrande, Nobuhiko Sugano, Bryan J McEntire, Wenliang Zhu, Leonardo Puppulin
The chemical interaction of femoral heads with polyethylene liners is an important new area of research in total hip arthroplasty (THA) as a consequence of an unabating quest for elongated artificial joint lifetimes. It is a topic that goes beyond simple mechanical behavior or wear. It seeks to describe the prosthetic device as a whole by adding chemical considerations to mechanics and abrasion. One of the poorly understood chemical interactions is oxygen affinity of the femoral heads. While oxygen unavoidably diffuses into the non-crystalline enclaves of the polyethylene liner as a result of its contact with the tribolayer, a ceramic femoral head can either attract or release oxygen due to its tribochemical interactions...
December 2, 2016: Biomedical Materials
https://www.readbyqxmd.com/read/27892564/zirconia-based-dental-ceramics-structure-mechanical-properties-biocompatibility-and-applications
#5
Chandkiram Gautam, Jarin Joyner, Amarendra Gautam, Jitendra Rao, Robert Vajtai
Zirconia (ZrO2) based dental ceramics have been considered to be advantageous materials with adequate mechanical properties for the manufacturing of medical devices. Due to its very high compression strength of 2000 MPa, ZrO2 can resist differing mechanical environments. During the crack propagation on the application of stress on the surface of ZrO2, a crystalline modification diminishes the propagation of cracks. In addition, zirconia's biocompatibility has been studied in vivo, leading to the observation of no adverse response upon the insertion of ZrO2 samples into the bone or muscle...
November 28, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27889306/return-to-sporting-activity-after-total-hip-arthroplasty-a-survey-of-members-of-the-british-hip-society
#6
Benjamin M Bradley, Stephen J Moul, Fintan J Doyle, Matthew J Wilson
BACKGROUND: Total hip arthroplasty is increasingly performed in younger, more active patients. Thirty-five percent of patients are involved in sports preoperatively, and a desire to return to sporting activity is now a major expectation. Sporting activity potentially risks premature failure of the implant, and there is no consensus or guidelines among British or European surgeons performing total hip arthroplasty in sporting patients. METHODS: The current practice of British Hip Society members was explored through a Web-based survey...
September 28, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27876256/do-changes-in-the-production-process-affect-the-outcome-of-ceramic-liners-a-3-year-follow-up-study
#7
Tom Schmidt-Braekling, Lisa Renner, Douglas N Mintz, Wenzel Waldstein, Yoshimi Endo, Friedrich Boettner
BACKGROUND: In 2011, the current liner was withdrawn from the market because of the potential risk for liner fracture secondary to increased pressures used to assemble the metal locking ring. The present study provides a short-term follow-up of patients with this implant. METHODS: We retrospectively evaluated 63 consecutive hips in 53 patients operated by a single surgeon using a recalled ceramic-on-ceramic bearing. There were 30 women and 23 men with an average age of 50...
October 20, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27871969/oxidized-zirconium-on-ceramic-catastrophic-coupling
#8
Vahit Emre Ozden, Necdet Saglam, Goksel Dikmen, Ismail Remzi Tozun
Oxidized zirconium (Oxinium™; Smith& Nephew, Memphis, TN, USA) articulatedwith polyethylene in total hip arthroplasty (THA) appeared to have the potential to reduce wear dramatically. The thermally oxidized metal zirconium surface is transformedinto ceramic like hard surface that is resistant to abrasion. The exposure of soft zirconium metal under hard coverage surface after the damage of oxidized zirconium femoral head have been described.It occurred following joint dislocation or in situ succeedingdisengagement of polyethylene liner...
November 18, 2016: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/27826763/dual-mobility-cup-in-total-hip-arthroplasty-in-patients-less-than-fifty-five-years-and-over-ten-years-of-follow-up-a-prospective-and-comparative-series
#9
Jean-Marc Puch, Guy Derhi, Loys Descamps, Régis Verdier, Jacques H Caton
PURPOSE: We report clinical and radiological outcome of a dual mobility cup (DMC) of 2nd generation after a minimum of ten year-follow-up (FU). The goal of this work was to compare the results of this DMC in patients aged less than 55 years and in patients aged more than 55 years. METHODS: From 2000 to 2005, a prospective and consecutive series of 119 THAs with a cementless DMC of 2nd generation (GIROS) were performed in patients aged less than 55 years and 444 in patients aged more than 55 years...
November 8, 2016: International Orthopaedics
https://www.readbyqxmd.com/read/27814917/outcomes-of-ceramic-bearings-after-primary-total-hip-arthroplasty-in-the-medicare-population
#10
Steven M Kurtz, Edmund Lau, Doruk Baykal, Bryan D Springer
BACKGROUND: The purpose of this study was to analyze the outcomes of ceramic bearings used in primary total hip arthroplasty (THA) in the Medicare population. METHODS: A total of 315,784 elderly Medicare patients (65+) who underwent primary THA between 2005 and 2014 were identified from the United States Medicare 100% national administrative hospital claims database. Outcomes of interest included infection, dislocation, revision, or mortality at any time point after primary surgery...
September 28, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27811144/the-damping-effect-of-cement-as-a-potential-mitigation-factor-of-squeaking-in-ceramic-on-ceramic-total-hip-arthroplasty
#11
F J Burgo, D E Mengelle, A Ozols, C Fernandez, C M Autorino
OBJECTIVES: Studies reporting specifically on squeaking in total hip arthroplasty have focused on cementless, and not on hybrid, fixation. We hypothesised that the cement mantle of the femur might have a damping effect on the sound transmitted through the metal stem. The objective of this study was to test the effect of cement on sound propagation along different stem designs and under different fixation conditions. METHODS: An in vitro model for sound detection, composed of a mechanical suspension structure and a sound-registering electronic assembly, was designed...
November 2016: Bone & Joint Research
https://www.readbyqxmd.com/read/27807111/cost-analysis-of-ceramic-heads-in-primary-total-hip-arthroplasty
#12
Keith J Carnes, Susan M Odum, Jennifer L Troyer, Thomas K Fehring
BACKGROUND: The advent of adverse local tissue reactions seen in metal-on-metal bearings, and the recent recognition of trunnionosis, have led many surgeons to recommend ceramic-on-polyethylene articulations for primary total hip arthroplasty. However, to our knowledge, there has been little research that has considered whether the increased cost of ceramic provides enough benefit over cobalt-chromium to justify its use. The primary purpose of this study was to compare the cost-effectiveness of ceramic-on-polyethylene implants and metal-on-polyethylene implants in patients undergoing total hip arthroplasty...
November 2, 2016: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/27791244/3rd-generation-alumina-on-alumina-in-modular-hip-prosthesis-13-to-18-years-follow-up-results
#13
Aldo Toni, Federico Giardina, Giovanni Guerra, Alessandra Sudanese, Maurizio Montalti, Susanna Stea, Barbara Bordini
INTRODUCTION: Ceramic-on-ceramic (CoC) couplings are alternative bearings surfaces that have been reported to reduce osteolysis, wear debris and aseptic loosening compared to the use of polyethylene. Early experiences with ceramics had poor results, but they have led to many improvements in the manufacture and design of subsequent implants. METHODS: We analysed medical files of 300 CoC total hip arthroplasty (THA) with a modular neck performed during period 1995-2000 by a single surgeon for a minimum follow-up of 13 years, evaluating clinical and radiological outcome...
October 24, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27791242/metal-ion-levels-in-ceramic-on-ceramic-thr-with-cobalt-chrome-modular-necks-analysis-of-cobalt-and-chromium-serum-levels-in-23-healthy-hip-patients
#14
Jan F A Somers, Lieven Dedrye, Sofie Goeminne
BACKGROUND: Modular necks in total hip replacement (THR) can be a source of metal ion release. METHODS: We measured the level of cobalt (Co) and chromium (Cr) ions in the serum of 23 healthy volunteers with a well-functioning ceramic-on-ceramic THR of a particular design, containing a cobalt-chrome (Co-Cr) stem and a Co-Cr modular neck. RESULTS: Average Co in serum was 1,71 µg/l; median Co was 1.50 µg/l. No patient had Co levels higher than 3...
October 24, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27783104/retrieval-analysis-of-ceramic-coated-metal-on-polyethylene-total-hip-replacements
#15
Harman Khatkar, Harry Hothi, Danielle de Villiers, Christian Lausmann, Daniel Kendoff, Thorsten Gehrke, John Skinner, Alister Hart
PURPOSE: Ceramic coatings have been used in metal-on-polyethylene (MOP) hips to reduce the risk of wear and also infection; the clinical efficacy of this remains unclear. This retrieval study sought to better understand the performance of coated bearing surfaces. METHODS: Forty-three coated MOP components were analysed post-retrieval for evidence of coating loss and gross polyethylene wear. Coating loss was graded using a visual semi-quantitative protocol. Evidence of gross polyethylene wear was determined by radiographic analysis and visual inspection of the retrieved implants...
October 25, 2016: International Orthopaedics
https://www.readbyqxmd.com/read/27770904/comparative-evaluation-of-electrical-conductivity-of-hydroxyapatite-ceramics-densified-through-ramp-and-hold-spark-plasma-and-post-sinter-hot-isostatic-pressing-routes
#16
M Buchi Suresh, P Biswas, V Mahender, Roy Johnson
Hydroxyapatite ceramics synthesized through sonochemical route were processed and densified through ramp & hold (R&H) and Spark Plasma Sintering (SPS) routes. The effect of processing route on the relative density and electrical conductivity were studied. Further, the samples were Hot Isostatically Pressed (HIP) under argon pressure at elevated temperature to further densify the sample. All these samples processed under different conditions were characterized by X-ray diffraction, Scanning Electron Microscopy and AC Conductivity...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27768219/head-neck-taper-corrosion-following-total-hip-arthroplasty-with-stryker-meridian-stem
#17
Sonika Patel, Carl T Talmo, Sumon Nandi
BACKGROUND: Taper corrosion at the modular junctions of total hip arthroplasty (THA) femoral stems are known to cause locally destructive adverse local tissue reaction (ALTR). However, the implants at risk remain to be fully elucidated. CASE REVIEW: We report the case of a 76-year-old woman with hip pain, abductor weakness, and sciatic nerve symptoms 2 years following metal-on-polyethylene THA. Serum cobalt levels were elevated, while chromium levels were normal...
November 10, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27768214/metal-on-polyethylene-is-not-an-option-after-the-fracture-of-a-ceramic-component-of-a-total-hip-arthroplasty
#18
Jenaro Á Fernández-Valencia
No abstract text is available yet for this article.
October 15, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27737298/ceramic-femoral-heads-for-all-patients-an-argument-for-cost-containment-in-hip-surgery
#19
Cody C Wyles, Benjamin A McArthur, Eric R Wagner, Matthew T Houdek, Jose H Jimenez-Almonte, Robert T Trousdale
Trunnionosis and taper corrosion have recently emerged as problems in total hip arthroplasty (THA). No longer restricted to metal-on-metal bearings, these phenomena now affect an increasing number of metal-on-polyethylene THAs and are exacerbated by modularity. Resulting increases in metal toxicity and patient morbidity, and the added costs of toxicity surveillance and revision surgery, will place a substantial economic burden on many health systems. Although they are more expensive than cobalt-chrome heads, ceramic femoral heads make metal toxicity a nonissue...
September 2016: American Journal of Orthopedics
https://www.readbyqxmd.com/read/27736716/a-testing-protocol-combining-shocks-hydrothermal-ageing-and-friction-applied-to-zirconia-toughened-alumina-zta-hip-implants
#20
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...
September 19, 2016: Journal of the Mechanical Behavior of Biomedical Materials
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