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https://www.readbyqxmd.com/read/28719787/in-vivo-performance-of-a-novel-anatomically-shaped-total-meniscal-prosthesis-made-of-polycarbonate-urethane-a-12-month-evaluation-in-goats
#1
Anne C T Vrancken, Gerjon Hannink, Wojciech Madej, Nico Verdonschot, Tony G van Tienen, Pieter Buma
BACKGROUND: Injury or loss of the meniscus generally leads to degenerative osteoarthritic changes in the knee joint. However, the treatment options for symptomatic patients with total meniscectomy are limited. Therefore, we developed a novel, anatomically shaped, total meniscal implant made of polycarbonate urethane. PURPOSE: To evaluate the in vivo performance of this novel total meniscal implant. The assessment particularly focused on the implant's response to long-term physiological loading in a goat model and its chondroprotective capacity in comparison to clinically relevant controls...
July 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28715322/optimal-mixed-tracking-impedance-control-with-application-to-transfemoral-prostheses-with-energy-regeneration
#2
Gholamreza Khademi, Hanieh Mohammadi, Hanz Richter, Dan Simon
OBJECTIVE: We design an optimal passivity-based tracking / impedance control system for a robotic manipulator with energy regenerative electronics, where the manipulator has both actively and semi-actively controlled joints. The semi-active joints are driven by a regenerative actuator that includes an energy-storing element. METHOD: External forces can have a large influence on energy regeneration characteristics. Impedance control is used to impose a desired relationship between external forces and deviation from reference trajectories...
July 13, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28715055/risk-of-surgical-site-infections-following-hip-and-knee-arthroplasty-results-of-the-ischia-gisio-study
#3
A Agodi, F Auxilia, M Barchitta, M L Cristina, D D'Alessandro, I Mura, M Nobile, C Pasquarella, Gisio Gisio-SItI
BACKGROUND: Surgical Site Infection (SSI) is one of the major complications following insertion of hip or knee prosthesis. The aim of the present study was to describe rates of SSIs and associated risk factors during hip and knee prosthesis procedures in Italian hospitals. METHODS: Italian hospitals were invited to join the ISChIA (Surgical Site Infections in Arthroplasty Surgery) project and participated in the study on a voluntary basis. SSI surveillance was performed according to the Hospitals in Europe Link for Infection Control through Surveillance (HELICS) -SSI protocol...
September 2017: Annali di Igiene: Medicina Preventiva e di Comunità
https://www.readbyqxmd.com/read/28708301/quantification-of-interfacial-motions-following-primary-and-revision-total-knee-arthroplasty-a-verification-study-versus-experimental-data
#4
Noel Conlisk, Colin R Howie, Pankaj Pankaj
Motion at the bone-implant interface, following primary or revision knee arthroplasty, can be detrimental to the long term survival of the implant. This study employs experimentally verified computational models of the distal femur to characterise the relative motion at the bone-implant interface for three different implant types; a posterior stabilising implant (PS), a total stabilising implant (TS) with short stem (12mm x 50mm), and a total stabilising implant (TS) with long offset stem (19mm x 150mm with a 4mm lateral offset)...
July 14, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28706395/salmonella-typhimurium-infection-in-total-knee-arthroplasty-a-case-report-with-review-of-literature
#5
Sujeesh Sebastian, Benu Dhawan, Rajesh Malhotra, Deepak Gautam, Arti Kapil
Salmonella enterica serotype Typhimurium is a rare cause of prosthetic joint infection (PJI). The recognized predisposing risk factors for Salmonella septic arthritis include diabetes mellitus, renal failure, human immunodeficiency virus infection and chronic corticosteroid use. We describe a case of PJI of the knee in a 74-year-old lady who was on antitubercular treatment. The patient presented with discharging sinus and raised inflammatory markers. She was successfully treated by the removal of prosthesis and debridement followed by ciprofloxacin therapy for 6 weeks...
July 2017: Journal of Laboratory Physicians
https://www.readbyqxmd.com/read/28701008/asymmetric-tibial-component-improved-the-coverage-and-rotation-of-the-tibial-component-in-a-medial-pivot-total-knee-prosthesis
#6
Yukihide Minoda, Mitsuhiko Ikebuchi, Shigekazu Mizokawa, Yoichi Ohta, Hiroaki Nakamura
No abstract text is available yet for this article.
July 12, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28691574/enhancement-of-a-prosthetic-knee-with-a-microprocessor-controlled-gait-phase-switch-reduces-falls-and-improves-balance-confidence-and-gait-speed-in-community-ambulators-with-unilateral-transfemoral-amputation
#7
Sara Agueda Fuenzalida Squella, Andreas Kannenberg, Ângelo Brandão Benetti
BACKGROUND: Despite the evidence for improved safety and function of microprocessor stance and swing-controlled prosthetic knees, non-microprocessor-controlled prosthetic knees are still standard of care for persons with transfemoral amputations in most countries. Limited feature microprocessor-control enhancement of such knees could stand to significantly improve patient outcomes. OBJECTIVES: To evaluate gait speed, balance, and fall reduction benefits of the new 3E80 default stance hydraulic knee compared to standard non-microprocessor-controlled prosthetic knees...
July 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28678126/the-effect-on-long-term-survivorship-of-surgeon-preference-for-posterior-stabilized-or-minimally-stabilized-total-knee-replacement-an-analysis-of-63-416-prostheses-from-the-australian-orthopaedic-association-national-joint-replacement-registry
#8
Christopher J Vertullo, Peter L Lewis, Michelle Lorimer, Stephen E Graves
BACKGROUND: Controversy still exists as to the optimum management of the posterior cruciate ligament (PCL) in total knee arthroplasty. Surgeons can choose to kinematically substitute the PCL with a posterior-stabilized total knee replacement or alternatively to utilize a cruciate-retaining, also known as minimally stabilized, total knee replacement. Proponents of posterior-stabilized total knee replacement propose that the reported lower survivorship in registries when directly compared with minimally stabilized total knee replacement is due to confounders such as selection bias because of the preferential usage of posterior-stabilized total knee replacement in more complex or severe cases...
July 5, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28669018/revision-knee-arthroplasty-using-a-distal-femoral-replacement-prosthesis-for-periprosthetic-fractures-in-elderly-patients
#9
Ehab Girgis, Christoph McAllen, Jonathan Keenan
PURPOSE: Distal femoral periprosthetic fractures above a total knee replacement in elderly patients are technically challenging to treat. Bone quality is often poor, the fractures comminuted, and post-operative mobilisation is difficult. This study assesses the clinical, radiological and functional outcome of revision knee distal femoral replacement (DFR) in these fractures. METHODS: We identified 14 patients over 70 years of age (70-94) who underwent DFR for periprosthetic fractures above a knee replacement...
July 1, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/28667383/comparison-of-fixed-bearing-and-mobile-bearing-total-knee-arthroplasty-after-high-tibial-osteotomy
#10
Philippe Hernigou, Maxime Huys, Jacques Pariat, François Roubineau, Charles Henri Flouzat Lachaniette, Arnaud Dubory
PURPOSE: There is no information comparing the results of fixed-bearing total knee replacement and mobile-bearing total knee replacement in the same patients previously treated by high tibial osteotomy. The purpose was therefore to compare fixed-bearing and mobile-bearing total knee replacements in patients treated with previous high tibial osteotomy. METHODS: We compared the results of 57 patients with osteoarthritis who had received a fixed-bearing prosthesis after high tibial osteotomy with the results of 41 matched patients who had received a rotating platform after high tibial osteotomy...
June 30, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28657567/bone-scan-in-painful-knee-arthroplasty-obsolete-or-actual-examination
#11
Giuseppe Niccoli, Domenico Mercurio, Fabrizio Cortese
ptic loosening, instability and infection are the major causes of TKA failure. For many years, nuclear medicine (NM) imaging was helpful to frame a painful total joint arthroplasty. The differentiation of septic from aseptic prosthetic loosening is critical. The latest AAOS guidelines to detect periprosthetic joint infection (PJI) restrict the role of NM scintigraphy. On the other hand, several studies suggest that NM imaging plays an important role in the evaluation of patients with painful prosthesis, but its specificity in differentiating aseptic loosening from infection is low...
June 7, 2017: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/28657561/total-knee-replacement-intraoperative-and-postoperative-kinematic-assessment
#12
M Bontempi, U Cardinale, L Bragonzoni, L Macchiarola, A Grassi, C Signorelli, G M Marcheggiani Muccioli, Stefano Zaffagnini
BACKGROUND AND AIM: The main goals of the total knee arthroplasty (TKA) is to reduce the perceived pain and  restore knee mobility and function in case of osteoarthritic knees joints. Literature shows how the three major causes of TKA failures are related to wear, loosening and instability and this is due to a problem of imbalance and malalignment. Intraoperative and postoperative kinematics analysis could be of benefit for improving surgery outcome. The aim of the present paper is to give an overview of the two set-up with the highest accuracy for intraoperative and postoperative TKA kinematics evaluation, currently in use at Istituto Ortopedico Rizzoli...
June 7, 2017: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/28657559/evolution-of-tka-design
#13
Carlo Dall'Oca, M Ricci, E Vecchini, N Giannini, D Lamberti, C Tromponi, B Magnan
The use of Total Knee Arthroplasty (TKA) in treatment of chronic degenerative pathologies of the knee boasts of an experience of 50 years. During this period the collaboration between surgeons and engineers produced many developments in the design of the prosthesis. Today this procedure is safe and established even if in continuous development. The progress in technologies and the use of new materials let researches try again old-fashioned techniques from the past in order to be improved. This enthusiasm for those discovers is not always going hand to hand with scientific validation: many open questions remains Every different concept of the design tries to answer to special needs as the reach of the highest ROM, the reduction of pain and debris, articular geometry, the type of fixation, the modularity of augments and stems, the types of constraints,  knee kinematic and of course costs...
June 7, 2017: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/28650802/translational-motion-tracking-of-leg-joints-for-enhanced-prediction-of-walking-tasks
#14
Roman Mark Stolyarov, Gary Burnett, Hugh Herr
OBJECTIVE: Prediction of walking tasks in powered leg prostheses is an important problem in the development of biomimetic prosthesis controllers. This article proposes a novel method to predict upcoming walking tasks by estimating the translational motion of leg joints using an inertial measurement unit. METHODS: We asked six subjects with unilateral transtibial amputations to traverse flat ground, ramps, and stairs using a powered prosthesis while inertial signals were remotely collected...
June 22, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28641476/direct-medical-costs-of-accidental-falls-for-adults-with-transfemoral-amputations
#15
Benjamin Mundell, Hilal Maradit Kremers, Sue Visscher, Kurtis Hoppe, Kenton Kaufman
BACKGROUND: Active individuals with transfemoral amputations are provided a microprocessor-controlled knee with the belief that the prosthesis reduces their risk of falling. However, these prostheses are expensive and the cost-effectiveness is unknown with regard to falls in the transfemoral amputation population. The direct medical costs of falls in adults with transfemoral amputations need to be determined in order to assess the incremental costs and benefits of microprocessor-controlled prosthetic knees...
June 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28630841/bipolar-hemiarthroplasty-in-a-patient-with-above-knee-amputation-surgical-technique
#16
Ramesh Perumal, Santhosh Ram Gaddam, J Vasudeva, J Dheenadhayalan, S Rajasekaran
INTRODUCTION: Femoral neck fractures are a common occurrence in lower limb amputees. Good post-operative results of hip hemiarthroplasty have been described in below-knee amputees. However, to our knowledge, very few such cases have been reported in above-knee amputees. CASE REPORT: We present a case of a 75-year-old male patient who underwent above-knee amputation of the right lower limb for severe crush injury right leg and a bipolar hemiarthroplasty for an ipsilateral fracture neck of femur sustained in the same road traffic accident...
January 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28616704/metallic-ion-release-after-knee-prosthesis-implantation-a-prospective-study
#17
Adrien Lons, Sophie Putman, Gilles Pasquier, Henri Migaud, Elodie Drumez, Julien Girard
INTRODUCTION: Metal-on-metal (MoM) hip replacement bearings produce metallic ions that can cause health complications. Metallic release also occurs with other materials, but data on metallic ion levels after knee arthroplasty are sparse. We postulate that knee replacement generates elevating metallic ions (chromium (Cr), cobalt (Co) and titanium (Ti)) during the first year after implantation. PATIENTS AND METHODS: This ongoing prospective study included all patients who underwent the same type of knee arthroplasty between May and December 2013...
June 14, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28608283/geometric-morphometric-analysis-reveals-age-related-differences-in-the-distal-femur-of-europeans
#18
Etienne Cavaignac, Frederic Savall, Elodie Chantalat, Marie Faruch, Nicolas Reina, Philippe Chiron, Norbert Telmon
BACKGROUND: Few studies have looked into age-related variations in femur shape. We hypothesized that three-dimensional (3D) geometric morphometric analysis of the distal femur would reveal age-related differences. The purpose of this study was to show that differences in distal femur shape related to age could be identified, visualized, and quantified using three-dimensional (3D) geometric morphometric analysis. METHODS: Geometric morphometric analysis was carried out on CT scans of the distal femur of 256 subjects living in the south of France...
December 2017: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/28607784/use-of-nonvascularized-autologous-fibular-strut-graft-in-the-treatment-of-major-bone-defect-after-periprosthetic-knee-fracture
#19
Vincenzo Giordano, Bruno Parilha Coutinho, Mateus Kenji Miyahira, Felipe Serrão Mendes de Souza, Ney Pecegueiro do Amaral
We present the case of a patient who suffered a comminuted supracondylar periprosthetic femur fracture. The patient was an 86-year-old lady who suffered a minor fall at home and presented at our hospital with a right comminuted distal femur fracture around a total knee arthroplasty. The patient was submitted to a cruciate-sacrificing total knee replacement 6 years before at the same institution. Despite severe metaphyseal fragmentation and short distal fragment, the prosthesis was stable; thus, open fracture reduction and stabilization with internal fixation were performed...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28606122/anterior-tibial-curved-cortex-is-a-reliable-landmark-for-tibial-rotational-alignment-in-total-knee-arthroplasty
#20
Joong Il Kim, Jak Jang, Ki Woong Lee, Hyuk Soo Han, Sahnghoon Lee, Myung Chul Lee
BACKGROUND: Rotational alignment of the tibial component is important for long-term success of total knee arthroplasty (TKA). This study aimed to compare five axes in normal and osteoarthritic (OA) knees to determine a reliable landmark for tibial rotational alignment in TKA. METHODS: One hundred twenty patients with OA knees and 40 with normal knees were included. The angle between a line perpendicular to the surgical transepicondylar axis and each of five axes were measured on preoperative computed tomography...
June 12, 2017: BMC Musculoskeletal Disorders
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