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Orthopaedic implant

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https://www.readbyqxmd.com/read/28208953/open-reduction-and-volar-plate-fixation-of-dorsally-displaced-distal-radius-fractures-a-prospective-study-of-functional-and-radiological-outcomes
#1
Arjun Ballal, Anand Kumar Sadasivan, Anoop Hegde, Ashwin Shetty
INTRODUCTION: The fractures of the distal radius have always posed a unique challenge to the orthopaedic fraternity. The complex ligamentous and bony anatomy offers a wide variety of fractures to be dealt with around this zone. Over the years these injuries have become common especially in the elderly age group as well as the implants and surgical techniques have improved. AIM: To assess the radiological and functional outcome after fixation of intra-articular dorsally displaced distal radius fractures with open reduction and volar Locking Compression Plate fixation (LCP)...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28204962/the-clinical-anatomy-of-the-insertion-of-the-rotator-cuff-tendons
#2
M Vosloo, N Keough, M A De Beer
The rotator cuff (RC) insertions according to most anatomical texts are described as being separate from one another. However, clear fusion of the RC tendon fibres exists with prior studies showing this interdigitation forming a common, continuous insertion onto and around the lesser and greater tubercles (LT and GT) of the humerus. Current surgical repair methods (especially arthroscopic techniques) rarely mention or consider these connections during repair and suture anchor implantation. The general principles of RC surgery remain a controversial subject, due to various available techniques, surgeon experience and preference, and the contradicting success rates...
February 16, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/28197990/a-chlorhexidine-releasing-epoxy-based-coating-on-titanium-implants-prevents-staphylococcus-aureus-experimental-biomaterial-associated-infection
#3
M Riool, A J Dirks, V Jaspers, L de Boer, T J Loontjens, C M van der Loos, S Florquin, I Apachitei, L N Rijk, H A Keul, S A Zaat
Prevention of biomaterial-associated infections (BAI) remains a challenging problem, in particular due to the increased risk of resistance development with the current antibiotic-based strategies. Metallic orthopaedic devices, such as non-cemented implants, are often inserted under high mechanical stress. These non-cemented implants cannot be protected by e.g. antibioticreleasing bone cement or other antimicrobial approaches, such as the use of bioactive glass. Therefore, in order to avoid abrasion during implantation procedures, we developed an antimicrobial coating with great mechanical stability for orthopaedic implants, to prevent Staphylococcus aureus BAI...
February 14, 2017: European Cells & Materials
https://www.readbyqxmd.com/read/28197703/contemporary-dual-mobility-cup-regional-and-private-register-methodology-and-results
#4
André Ferreira, Jean-Louis Prudhon, Régis Verdier, Jean-Marc Puch, Loys Descamps, Guy Dehri, Marcel Remi, Jacques H Caton
INTRODUCTION: The dual-mobility cup (DMC) was introduced in 1979. Due to lack of referenced publications, this interesting and innovating concept was ignored during close to 20 years. However, 180 studies (level III or IV) have now been published. Evidence-based medicine is based on level I studies. Over the past three decades, the role of national registries developed with the intention of surveying orthopaedic implants. In 2012, we developed, registered, and implemented a specific database for contemporary DMC...
February 14, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28194715/does-extracellular-dna-production-vary-in-staphylococcal-biofilms-isolated-from-infected-implants-versus-controls
#5
Beata Zatorska, Marion Groger, Doris Moser, Magda Diab-Elschahawi, Luigi Segagni Lusignani, Elisabeth Presterl
BACKGROUND: Prosthetic implant infections caused by Staphylococcus aureus and epidermidis are major challenges for early diagnosis and treatment owing to biofilm formation on the implant surface. Extracellular DNA (eDNA) is actively excreted from bacterial cells in biofilms, contributing to biofilm stability, and may offer promise in the detection or treatment of such infections. QUESTIONS/PURPOSES: (1) Does DNA structure change during biofilm formation? (2) Are there time-dependent differences in eDNA production during biofilm formation? (3) Is there differential eDNA production between clinical and control Staphylococcal isolates? (4) Is eDNA production correlated to biofilm thickness? METHODS: We investigated eDNA presence during biofilm formation in 60 clinical and 30 control isolates of S aureus and S epidermidis...
February 13, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28188485/feasibility-of-laser-guided-percutaneous-pedicle-screw-placement-in-the-lumbar-spine-using-a-hybrid-or
#6
P H Richter, F Gebhard, M Salameh, K Schuetze, M Kraus
PURPOSE: Innovations in intraoperative imaging lead to major changes in orthopaedic surgery. In our setting, a 3D flat-panel c-arm (Artis zeego) is mounted on a robotic arm offering an integrated aiming tool (Syngo iGuide). Our aim was to investigate the feasibility of Syngo iGuide for pedicle screw placement in comparison with fluoroscopic screw implantation. METHODS: In 10 lumbar models, 100 screws were implanted. In 5 models, a standard fluoroscopic technique was used...
February 10, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28188395/marshall-r-urist-and-the-discovery-of-bone-morphogenetic-proteins
#7
Lovorka Grgurevic, Marko Pecina, Slobodan Vukicevic
Over the last 40 years International Orthopaedics has published a series of articles on bone morphogenetic proteins (BMPs) covering topics from basic research to clinical applications. This includes also work submitted from the Laboratory for Mineralized Tissues of the School of Medicine University of Zagreb. Accordingly, we felt obliged to give a short summary of Dr. Urist's life and work as our gratitude to his discovery that demineralized bone matrix (DBM) activity induces bone when implanted ectopically into the muscle or under the skin due to bone inducing proteins, named BMPs...
February 11, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28183325/percutaneous-internal-fixation-with-y-strut%C3%A2-device-to-prevent-both-osteoporotic-and-pathological-hip-fractures-a-prospective-pilot-study
#8
François H Cornelis, Lambros Tselikas, Thibault Carteret, Bruno Lapuyade, Thierry De Baere, Jean Charles Le Huec, Frédéric Deschamps
BACKGROUND: We studied Y-STRUT® (Hyprevention, France), a new percutaneous internal fixation device, in combination with bone cementoplasty to prevent hip fracture. METHODS: Between February 2013 and February 2015, a total of 16 femoral necks in 4 osteoporotic and 12 oncologic patients have been considered for prophylactic consolidation in this prospective multicentre pilot study involving 4 different hospitals. These consolidations were performed percutaneously under fluoroscopic guidance using Y-STRUT®, a dedicated internal fixation device...
February 9, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28167869/bearings-in-hip-arthroplasty-joint-registries-vs-precision-medicine-review-article
#9
REVIEW
Mark J Pearson, Liam M Grover, Janet M Lord, Simon W Jones, Edward T Davis
BACKGROUND: Precision medicine has been adopted in a range of clinical settings where omics data have led to greater characterisation of disease and stratification of patients into subcategories of phenotypes and pathologies. However, in orthopaedics, precision medicine lags behind other disciplines such as cancer. Joint registries have now amassed a huge body of data pertaining to implant performance which can be broken down into performance statistics for different material types in different cohorts of patients...
February 2017: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/28167866/the-role-of-metal-on-metal-bearings-in-total-hip-arthroplasty-and-hip-resurfacing-review-article
#10
David Sands, Emil H Schemitsch
BACKGROUND: The current role of metal-on-metal (MoM) bearings in hip arthroplasty remains controversial. The low wear offered by MoM bearings compared to metal-on-polyethylene and the possibility of a lower risk of dislocation with larger head sizes, encouraged a trend towards the re-introduction of the MoM bearing couple. However, recent evidence has shown that not all designs of the MoM bearing have been successful. QUESTIONS/PURPOSES: The purpose of this paper is to provide an update on the use of MoM bearings and address the following issues: (1) the reintroduction of metal-on-metal bearings in total hip arthroplasty, (2) the failure of metal-on-metal bearings in stemmed total hip arthroplasty, (3) the role of metal-on-metal hip resurfacing in modern orthopaedics and (4) metal-on-metal hip resurfacing versus total hip arthroplasty...
February 2017: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/28163787/statistical-shape-models-of-cuboid-navicular-and-talus-bones
#11
Aleksandra U Melinska, Patryk Romaszkiewicz, Justyna Wagel, Bartlomiej Antosik, Marek Sasiadek, D Robert Iskander
BACKGROUND: The aim was to develop statistical shape models of the main human tarsal bones that would result in novel representations of cuboid, navicular and talus. METHODS: Fifteen right and 15 left retrospectively collected computed tomography data sets from male individuals, aged from 17 to 63 years, with no known foot pathology were collected. Data were gathered from 30 different subjects. A process of model building includes image segmentation, unifying feature position, mathematical shape description and obtaining statistical shape geometry...
2017: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/28157079/treatment-outcomes-and-quality-of-life-after-the-implantation-of-modular-prostheses-of-the-proximal-femur-in-patients-with-cancer-metastases
#12
Grzegorz Guzik
BACKGROUND: Surgical treatment of pathological fractures of the proximal femur with intramedullary rods produces good short-term outcomes, but after some time the fixation often becomes unstable in patients with a good prognosis and a repeat surgery is required. Modular prostheses allow for better long-term outcomes. MATERIAL AND METHODS: A total of 64 surgical resection procedures for metastatic tumours of the proximal femur combined with the implantation of modular prostheses were performed at the Oncological Orthopaedics Department in Brzozów in 2010-2014...
May 5, 2016: Ortopedia, Traumatologia, Rehabilitacja
https://www.readbyqxmd.com/read/28154812/qivas-therapy-for-treatment-of-implant-associated-mdr-bacterial-infection
#13
Varun Chouhan
INTRODUCTION: Orthopedic implant-associated infections are difficult to treat, both physically and psychologically, for the patient and the surgeon as well. Organisms capable of forming biofilms tend to be more virulent and have ability of causing chronic infections. Chronic implant associated infections are very difficult to treat, requires a lot of time, money and other resources. Chronic infections produce a lot of morbidity and sometimes mortality to the patient. CASE REPORT: A 40-year-old male treated for bilateral acetabular fracture sustained after fall from height due to an episode of seizure...
April 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28153480/radiographic-predictors-of-symptomatic-screw-removal-after-retrograde-femoral-nail-insertion
#14
Max Hamaker, Nathan N O'Hara, W Andrew Eglseder, Marcus F Sciadini, Jason W Nascone, Robert V O'Toole
INTRODUCTION: Removal of symptomatic implants is a common procedure performed by orthopaedic trauma surgeons. No guidance is available regarding which factors contribute to the likelihood of an implant becoming symptomatic. Our objective was to determine whether radiographic parameters associated with distal interlocks in retrograde femoral nails are associated with the rate of symptomatic screw removal. PATIENTS AND METHODS: We conducted a retrospective review at a Level I trauma center...
January 6, 2017: Injury
https://www.readbyqxmd.com/read/28142354/the-use-of-three-dimensional-printing-technology-in-orthopaedic-surgery
#15
Tak Man Wong, Jimmy Jin, Tak Wing Lau, Christian Fang, Chun Hoi Yan, Kelvin Yeung, Michael To, Frankie Leung
Three-dimensional (3-D) printing or additive manufacturing, an advanced technology that 3-D physical models are created, has been wildly applied in medical industries, including cardiothoracic surgery, cranio-maxillo-facial surgery and orthopaedic surgery. The physical models made by 3-D printing technology give surgeons a realistic impression of complex structures, allowing surgical planning and simulation before operations. In orthopaedic surgery, this technique is mainly applied in surgical planning especially revision and reconstructive surgeries, making patient-specific instruments or implants, and bone tissue engineering...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28140564/mussel-inspired-multifunctional-hydrogel-coating-for-prevention-of-infections-and-enhanced-osteogenesis
#16
Hao Cheng, Kan Yue, Mehdi Kazemzadeh-Narbat, Yanhui Liu, Akbar Khalilpour, Bingyun Li, Yu Shrike Zhang, Nasim Annabi, Ali Khademhosseini
Prevention of post-surgery infection and promotion of bio-integration are the key factors to achieve long-term success in orthopaedic implants. Localized delivery of antibiotics and bioactive molecules by the implant surface serves as a promising approach towards these goals. However, previously reported methods for surface functionalization of the titanium (Ti) alloy implants to load bioactive ingredients suffer from time-consuming complex processes and lack of long-term stability. Here, we present the design and characterization of an adhesive, osteoconductive, and antimicrobial hydrogel coating for Ti implants...
January 31, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28135051/angiogenesis-assays-for-the-evaluation-of-angiogenic-properties-of-orthopaedic-biomaterials-a-general-review
#17
REVIEW
Wai Ching Liu, Shihui Chen, Lizhen Zheng, Ling Qin
Vascularization is an essential process in bone formation, remodeling and regeneration during both bone development and fracture repair. Vascularization remains a big challenge directly leading to the final success of newly regenerated bone. In this review, the advantages and disadvantages of different angiogenesis assays and bone defect models are described in details for investigating revascularization of materials of interest. Unlike conventional angiogenesis study with growth factors or pharmaceutical molecules performed in two-dimension, special considerations are taken into account whether these assays can be translated for testing three-dimensional implantable devices...
January 30, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28111338/the-potential-of-isotopically-enriched-magnesium-to-study-bone-implant-degradation-in-vivo
#18
Johannes Draxler, Elisabeth Martinelli, Annelie M Weinberg, Andreas Zitek, Johanna Irrgeher, Martin Meischel, Stefanie E Stanzl-Tschegg, Bernhard Mingler, Thomas Prohaska
: This pilot study highlights the substantial potential of using isotopically enriched (non-radioactive) metals to study the fate of biodegradable metal implants. It was possible to show that Mg release can be observed by combining isotopic mass spectrometry and isotopic pattern deconvolution for data reduction, even at low amounts of Mg released a from slowly degrading (26)Mg enriched (>99%) Mg metal. Following implantation into rats, structural in vivo changes were monitored by μCT...
January 19, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28110182/a-large-taper-mismatch-is-one-of-the-key-factors-behind-high-wear-rates-and-failure-at-the-taper-junction-of-total-hip-replacements-a-finite-element-wear-analysis
#19
Ariyan Ashkanfar, David J Langton, Thomas J Joyce
Total hip replacement (THR) is one of the most successful orthopaedic surgeries; however, failures can occur due to adverse reactions to wear debris. Recently, a large number of failures linked to the release of metal particles from the taper junction between femoral head and femoral stem have been reported. One possible reason for this may be design variations such as taper mismatches associated with the taper and trunnion angles. Could a large taper mismatch lead to inappropriate contact mechanics and increase relative micromotion and thus wear? In this study, 3D finite element (FE) models of a commercial THR from a perfectly matched interface to large taper mismatches and a wear algorithm were used to investigate the extent of wear that could occur at this junction and identify the optimum tolerances in order to reduce the wear...
January 12, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28102294/novel-bio-functional-magnesium-coating-on-porous-ti6al4v-orthopaedic-implants-in-vitro-and-in-vivo-study
#20
Xiaokang Li, Peng Gao, Peng Wan, Yifeng Pei, Lei Shi, Bo Fan, Chao Shen, Xin Xiao, Ke Yang, Zheng Guo
Titanium and its alloys with various porous structures are one of the most important metals used in orthopaedic implants due to favourable properties as replacement for hard tissues. However, surface modification is critical to improve the osteointegration of titanium and its alloys. In this study, a bioactive magnesium coating was successfully fabricated on porous Ti6Al4V by means of arc ion plating, which was proved with fine grain size and high film/substrate adhesion. The surface composition and morphology were characterized by X-ray diffraction and SEM equipped with energy dispersive spectroscopy...
January 19, 2017: Scientific Reports
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