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Orthopaedic implant

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https://www.readbyqxmd.com/read/29219020/correlation-of-mri-appearance-of-autologous-chondrocyte-implantation-in-the-ankle-with-clinical-outcome
#1
Keith W Chan, Richard D Ferkel, Brian Kern, Sarah S Chan, Gregory R Applegate
The objective of this study was to characterize magnetic resonance imaging (MRI) findings and correlate with clinical results in patients who underwent autologous chondrocyte implantation (ACI) of osteochondral lesions of the talus (OLT). METHODS: Twenty-four grafts were evaluated at a mean 65.8 months after ACI for OLT. MRI was performed on a 1.5-T GE scanner using multiple sequences. Graft appearance was compared with preoperative MRI and evaluated for 6 criteria: defect fill, surface regularity, signal pattern, bone marrow edema, subchondral plate irregularity, and presence of cystic lesions...
January 2018: Cartilage
https://www.readbyqxmd.com/read/29208288/rhombicuboctahedron-unit-cell-based-scaffolds-for-bone-regeneration-geometry-optimization-with-a-mechanobiology-driven-algorithm
#2
Antonio Boccaccio, Michele Fiorentino, Antonio E Uva, Luca N Laghetti, Giuseppe Monno
In a context more and more oriented towards customized medical solutions, we propose a mechanobiology-driven algorithm to determine the optimal geometry of scaffolds for bone regeneration that is the most suited to specific boundary and loading conditions. In spite of the huge number of articles investigating different unit cells for porous biomaterials, no studies are reported in the literature that optimize the geometric parameters of such unit cells based on mechanobiological criteria. Parametric finite element models of scaffolds with rhombicuboctahedron unit cell were developed and incorporated into an optimization algorithm that combines them with a computational mechanobiological model...
February 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29205219/experimental-analysis-of-insertion-torques-and-forces-of-threaded-and-press-fit-acetabular-cups-by-means-of-ex-vivo-and-in-vivo-measurements
#3
Danny Vogel, Andreas Rathay, Stephanie Teufel, Martin Ellenrieder, Carmen Zietz, Manuela Sander, Rainer Bader
PURPOSE: In THA a sufficient primary implant stability is the precondition for successful secondary stability. Industrial foams of different densities have been used for primary stability investigations. The aim of this study was to analyse and compare the insertion behaviour of threaded and press-fit cups in vivo and ex vivo using bone substitutes with various densities. METHODS: Two threaded (Bicon Plus®, Trident® TC) and one press-fit cup (Trident PSL®) were inserted by orthopaedic surgeons (S1, S2) into 10, 20 and 31 pcf blocks, using modified surgical instruments allowing measurements of the insertion forces and torques...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29204491/a-simple-technique-to-remove-well-fixed-acetabular-components-in-revision-of-total-hip-arthroplasty
#4
Xiaoqi Zhang, Fei Hu, Rui He, Xu Li, Xiaofeng Ji, Xifu Shang
Removing well-fixed acetabular components can be a challenge for orthopaedic surgeons in revision of total hip arthroplasty. Acetabular bone loss, fracture, and other complications occurred in extracting implants may result in instability and fail of revision. Thus, instruments are developed to avoid such complications. We report a simple technique by drilling a tunnel on the superolateral quadrant of acetabulum and using an offset staff to remove acetabular components without many matching units. The procedure of removing well-fixed acetabular components is a simple, efficient, inexpensive, bone stock preserving technique...
December 2017: Arthroplasty Today
https://www.readbyqxmd.com/read/29196225/hip-prostheses-in-young-adults-surface-prostheses-and-short-stem-prostheses
#5
X Gallart, J Riba, J A Fernández-Valencia, G Bori, E Muñoz-Mahamud, A Combalia
The poor results obtained in young patients when using a conventional prosthesis led to the resurgence of hip resurfacing to find less invasive implants for the bone. Young patients present a demand for additional activity, which makes them a serious challenge for the survival of implants. In addition, new information technologies contribute decisively to the preference for non-cemented prostheses. Maintaining quality of life, preserving the bone and soft tissues, as well as achieving a very stable implant, are the goals of every hip orthopaedic surgeon for these patients...
November 28, 2017: Revista Española de Cirugía Ortopédica y Traumatología
https://www.readbyqxmd.com/read/29195062/compressive-stockings-after-hindfoot-and-ankle-surgery
#6
Florian Grubhofer, Sabrina Catanzaro, Regula Schüpbach, Mohamed A Imam, Stephan Wirth
BACKGROUND: Swelling and pain are common after foot and ankle procedures. We hypothesized that compressive stockings (CS) treatment after hindfoot surgery would positively influence patient outcomes. METHODS: We undertook this randomized controlled trial in 87 consecutive patients to analyze the clinical effect of CS after hindfoot and ankle surgery and evaluate CS-wearing compliance using sensors that were implanted into CS. Ankle swelling, pain status, quality of life (SF-36 score), and the American Orthopaedic Foot & Ankle Score (AOFAS) were set as the primary end points...
November 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/29190787/magnification-of-digital-hip-radiographs-differs-between-clinical-workplaces
#7
Jana Hornová, Pavel Růžička, Maroš Hrubina, Eduard Šťastný, Andrea Košková, Petr Fulín, Jiří Gallo, Matej Daniel
Preoperative planning for total hip arthroplasty includes templating on anteroposterior radiographs. It is necessary to consider radiographic magnification in order to scale templates accurately. Studies dealing with hip templating report different values of radiographic magnification. It is not clear if the observed difference in magnification between the studies is caused by variability in studied groups, methodology or instrumentation. We hypothesize that there is a difference in magnification between clinical workplaces...
2017: PloS One
https://www.readbyqxmd.com/read/29187035/immobilisation-of-hydroxyapatite-collagen-on-polydopamine-grafted-stainless-steel-316l-coating-adhesion-and-in-vitro-cells-evaluation
#8
Zafirah Tapsir, Farah H Jamaludin, Belinda Pingguan-Murphy, Syafiqah Saidin
The utilisation of hydroxyapatite and collagen as bioactive coating materials could enhance cells attachment, proliferation and osseointegration. However, most methods to form crystal hydroxyapatite coating do not allow the incorporation of polymer/organic compound due to production phase of high sintering temperature. In this study, a polydopamine film was used as an intermediate layer to immobilise hydroxyapatite-collagen without the introduction of high sintering temperature. The surface roughness, coating adhesion, bioactivity and osteoblast attachment on the hydroxyapatite-collagen coating were assessed as these properties remains unknown on the polydopamine grafted film...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/29186079/assessment-of-embedded-conjugated-polymer-sensor-arrays-for-potential-load-transmission-measurement-in-orthopaedic-implants
#9
Carolina Micolini, Frederick Benjamin Holness, James A Johnson, Aaron David Price
Load transfer through orthopaedic joint implants is poorly understood. The longer-term outcomes of these implants are just starting to be studied, making it imperative to monitor contact loads across the entire joint implant interface to elucidate the force transmission and distribution mechanisms exhibited by these implants in service. This study proposes and demonstrates the design, implementation, and characterization of a 3D-printed smart polymer sensor array using conductive polyaniline (PANI) structures embedded within a polymeric parent phase...
November 29, 2017: Sensors
https://www.readbyqxmd.com/read/29181359/articular-reconstruction-using-subchondral-cementation-and-threaded-kirschner-wires-in-giant-cell-tumor-a-novel-technique
#10
Padmanabh H Vora, Rameez Musa, Neel M Bhavsar, Darshan Shah
Introduction: Giant Cell Tumor(GCT) is one of an infrequently encountered tumor by orthopaedic surgeons in clinical practice. It is described as 'locally malignant' tumor found in epimetaphyseal region of long bones, peculiarly around knee. We present a case of a solitary, benign Campanacci Grade 2 GCT in right lateral femoral condyle in 38 year old female and our treatment. Case Report: A 38 year old female presented to our outpatient department with chief complaint of constant, moderate pain in right knee increasing in duration since 3 months...
July 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/29180271/reconstructive-techniques-for-revision-and-limb-salvage-surgery-in-persons-with-haemophilia
#11
C Carulli, M Zago, A R Rizzo, M Innocenti
Haemophilia is an inherited haemorrhagic disease characterized by the lack of coagulative factors associated nowadays mostly to musculoskeletal complications, particularly severe secondary arthritis in specific joints. Recurrent traumatic or spontaneous joint bleeding, induce severe arthropathy at a young age that can be treated only by joint replacement. Total knee or hip arthroplasty in young subjects may fail earlier due to wear or infections and in the haemophilic population, this means bone loss, pseudo tumours and the need of revision or even limb salvage surgery...
October 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/29162306/osteosynthesis-of-ao-ota-13-c3-distal-humeral-fractures-in-patients-older-than-70-years
#12
Steven F Shannon, Eric R Wagner, Matthew T Houdek, Daniel Mascarenhas, Raymond A Pensy, Walter A Eglseder
OBJECTIVE: The purpose of this retrospective case series was to examine the AO Foundation and Orthopaedic Trauma Association (AO/OTA) 13-C3 distal humeral fractures treated with open reduction-internal fixation (ORIF) in patients older than 70 years. METHODS: During an 8-year period, 21 patients older than 70 years with AO/OTA 13-C3 distal humeral fractures were treated with ORIF performed by 2 senior upper extremity traumatologists. There were 16 patients with >1 year of follow-up, with a mean age of 78 (70-84) years...
November 18, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29156072/clinical-and-radiologic-outcomes-of-metatarsophalangeal-hemiarthroplasty-a-review-of-12-consecutive-cases
#13
Florian Wanivenhaus, Jacqueline Fust, Matthias Erschbamer, Andreas Schirm
This study examined function, pain, satisfaction, and radiologic outcomes among patients treated with first metatarsophalangeal hemiarthroplasty. Patients were invited to participate in an outcome study conducted with questionnaires on subjective and objective outcomes and clinical and radiographic follow-up. A total of 12 patients (12 feet; mean patient age, 58.8±12.3 years) agreed to participate. Mean follow-up was 22.3±19.8 months. Of these patients, 7 were satisfied with the postoperative result. The mean visual analog scale pain score decreased significantly from 7...
November 20, 2017: Orthopedics
https://www.readbyqxmd.com/read/29149204/evaluation-of-osseous-integration-of-titanium-orthopedic-screws-with-novel-sla-treatment-in-porcine-model
#14
Tzu-Hsiang Lin, Hsin-Tai Hu, Hsueh-Chun Wang, Meng-Chian Wu, Shu-Wei Wu, Ming-Long Yeh
The success of many endosseous implants in orthopaedic and dental applications depends on the surface characteristics, as they affect osseous integration. Previous investigations indicated that a novel large-grit sand-blasted and acid-etched (SLA) titanium (denoted as SLAffinity-Ti) implant had better bone integration than that of a comparably shaped implant with a plasma-sprayed titanium surface. The purpose of the present investigation was to create a SLAffinity surface on pedicle screws and trauma screws and to compare it with the surfaces of a sand-blasted-only implant and commercial implants in terms of bone integration...
2017: PloS One
https://www.readbyqxmd.com/read/29146221/takedown-of-ankle-arthrodesis-with-insufficient-fibula-surgical-technique-and-intermediate-term-follow-up
#15
John M Schuberth, Jeffrey C Christensen, Chad Seidenstricker
Conversion of ankle arthrodesis to total ankle arthroplasty has recently gained popularity. However, technical challenges are present when treating patients without a sufficient fibular buttress. We describe a technique for restoration of an adequate fibular buttress using an iliac crest bone graft or malleolar relocation. The results of 10 patients with an average follow-up period of 56 (range 24 to 123) months are presented. Of the 10 patients, 3 underwent tricortical iliac bone augmentation of the fibula, 4 underwent repositioning of the remnant fibula, and in 3, the in situ fibula was used...
November 14, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29146220/autologous-chondrocyte-implantation-for-talar-osteochondral-lesions-comparison-between-5-year-follow-up-magnetic-resonance-imaging-findings-and-7-year-follow-up-clinical-results
#16
Gherardo Pagliazzi, Francesca Vannini, Milva Battaglia, Laura Ramponi, Roberto Buda
Autologous chondrocyte implantation (ACI) is an established surgical procedure that has provided satisfactory results. The aim of the present study was to correlate the clinical outcomes of a series of 20 patients treated by ACI at a 7-year follow-up examination with the magnetic resonance imaging (MRI) T2-mapping 5-year follow-up findings. We evaluated 20 patients using the American Orthopaedic Foot and Ankle Society (AOFAS) score preoperatively and the established follow-up protocol until 87.2 ± 14.5 months...
November 14, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29145966/outcome-evaluation-of-staged-treatment-for-bicondylar-tibial-plateau-fractures
#17
Vincenzo Giordano, Ney Pecegueiro do Amaral, Hilton A Koch, Rodrigo Pires E Albuquerque, Felipe Serrão de Souza, José Félix Dos Santos Neto
BACKGROUND: The universal accepted strategy for treating high-energy tibial plateau fractures remains a topic of ongoing debate. The challenge for the practicing orthopaedic trauma surgeon is to provide anatomical articular fracture reduction, with successfully managing the complex soft-tissue injury that is commonly present at patient admission. The primary aim of the actual study was to evaluate the results of a staged protocol for the treatment of high-energy bicondylar tibial plateau fractures...
October 2017: Injury
https://www.readbyqxmd.com/read/29145437/assessment-of-the-suitability-of-biodegradable-rods-for-use-in-posterior-lumbar-fusion-an-in-vitro-biomechanical-evaluation-and-finite-element-analysis
#18
Fon-Yih Tsuang, Yueh-Ying Hsieh, Yi-Jie Kuo, Chia-Hsien Chen, Feng-Huei Lin, Chen-Sheng Chen, Chang-Jung Chiang
Interbody fusion with posterior instrumentation is a common method for treating lumbar degenerative disc diseases. However, the high rigidity of the fusion construct may produce abnormal stresses at the adjacent segment and lead to adjacent segment degeneration (ASD). As such, biodegradable implants are becoming more popular for use in orthopaedic surgery. These implants offer sufficient stability for fusion but at a reduced stiffness. Tailored to degrade over a specific timeframe, biodegradable implants could potentially mitigate the drawbacks of conventional stiff constructs and reduce the loading on adjacent segments...
2017: PloS One
https://www.readbyqxmd.com/read/29142320/biocompatibility-and-biodegradation-studies-of-a-commercial-zinc-alloy-for-temporary-mini-implant-applications
#19
M Bobby Kannan, Corey Moore, Shruti Saptarshi, Sahadev Somasundaram, Mohamed Rahuma, Andreas L Lopata
In this study, the biocompatibility and in vitro degradation behaviour of a commercial zinc-based alloy (Zn-5 Al-4 Mg) were evaluated and compared with that of pure zinc for temporary orthopaedic implant applications. Biocompatibility tests were conducted using human alveolar lung epithelial cells (A549), which showed that the zinc alloy exhibits similar biocompatibility as compared to pure zinc. In vitro degradation evaluation was performed using weight loss and electrochemical methods in simulated body fluid (SBF) at 37 °C...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29139579/topical-adjuvants-incompletely-remove-adherent-staphylococcus-aureus-from-implant-materials
#20
Emily P Ernest, Anthony S Machi, Brock A Karolcik, P Rocco LaSala, Matthew J Dietz
Adjuvant treatments including Betadine, Dakin's solution (sodium hypochlorite), or hydrogen peroxide (H2O2) have been attempted to eradicate prosthetic joint infection caused by biofilm or intracellular bacteria. The purpose of this study was to evaluate the in vitro abilities of chemical adjuvants to decrease Staphylococcus aureus (S. aureus) biofilm presence on orthopaedic implant grade materials, including titanium, stainless steel, and cobalt chrome. S. aureus biofilms were grown for 48 hours and evaluated for baseline colony forming units/centimeter squared (CFU/cm(2) ) and compared to treatments with Betadine, Dakin's solution, H2 O2 , or 1% chlorine dioxide (ClO2 )...
November 15, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
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