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https://www.readbyqxmd.com/read/28437545/union-knee-alignment-and-clinical-outcomes-of-patients-treated-with-autologous-bone-grafting-for-medial-tibial-defects-in-primary-total-knee-arthroplasty
#1
Kunihiro Hosaka, Shu Saito, Teruyasu Oyama, Hirohisa Fujimaki, Eiji Cho, Kanki Ishigaki, Yasuaki Tokuhashi
Autologous bone grafting is an established method to overcome bone deficiencies in primary total knee arthroplasty (TKA). However, recently, metal augments have been used by many surgeons. Although autologous bone grafting is a common technique, few large studies have described its success in achieving bone union in primary TKA. The goal of this study was to evaluate primary TKA with autologous bone grafting for tibial defects. A total of 68 knees that had undergone arthroplasty with autologous bone grafting with more than 1 year of follow-up were evaluated...
April 24, 2017: Orthopedics
https://www.readbyqxmd.com/read/28436379/economic-analysis-of-4221-revisions-due-to-periprosthetic-joint-infection-in-poland
#2
Ireneusz Babiak, Piotr Pędzisz, Jakub Janowicz, Mateusz Kulig, Paweł Małdyk
BACKGROUND: Periprosthetic joint infection (PJI) is one of the most severe complications of total hip (THA) and total knee (TKA) arthroplasty. The aim of the study is to determine the number and type of hip and knee prosthesis revisions in Poland performed due to infection and reimbursement of the cost of septic revisions and to compare the costs of septic and aseptic revisions in Poland and other countries. MATERIAL AND METHODS: The data published for the period 2009-2013 by the National Health Fund (NHF) were analysed and the average cost of septic and aseptic revisions was calculated...
January 26, 2017: Ortopedia, Traumatologia, Rehabilitacja
https://www.readbyqxmd.com/read/28427318/load-application-for-the-contact-mechanics-analysis-and-wear-prediction-of-total-knee-replacement
#3
Jing Zhang, Zhenxian Chen, Ling Wang, Dichen Li, Zhongmin Jin
Tibiofemoral contact forces in total knee replacement have been measured at the medial and lateral sites respectively using an instrumented prosthesis, and predicted from musculoskeletal multibody dynamics models with a reasonable accuracy. However, it is uncommon that the medial and lateral forces are applied separately to replace a total axial load according to the ISO standard in the majority of current finite element analyses. In this study, we quantified the different effects of applying the medial and lateral loads separately versus the traditional total axial load application on contact mechanics and wear prediction of a patient-specific knee prosthesis...
May 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28422623/knee-stiffness-and-viscosity-new-implementation-and-perspectives-in-prosthesis-development
#4
Klemen Bohinc, Nejc Vantur, Drago Torkar, Tomaž Lampe, Marija Hribernik, Miroljub Jakovljević
The pendulum test is a method applied to measure passive resistance of the knee. A new and simple pendulum test with instrumentation based on infrared camera was used to evaluate knee stiffness and viscosity on a female human cadaver. The stiffness and viscosity were calculated based on the kinetic data. During the measurements, the periarticular and intraarticular soft tissue of the knee was gradually removed to determine the stiffness and viscosity as a function of the tissue removal rate. The measurements showed that the removal of tissue around the joint reduces the damping of leg oscillation, and therefore decreases the stiffness and viscosity...
April 19, 2017: Bosnian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/28422559/the-influence-of-ambulatory-aid-on-lower-extremity-muscle-activation-during-gait
#5
Michael Sanders, Anton E Bowden, Spencer Baker, Ryan Jensen, McKenzie Nichols
CONTEXT: Foot and ankle injuries are common, and often require a non-weight bearing period of immobilization for the involved leg. This non-weight bearing period usually results in muscle atrophy for the involved leg. There is a dearth of objective data describing muscle activation for different ambulatory aids that are used during the aforementioned non-weight bearing period. OBJECTIVE: To compare activation amplitudes for four leg muscles during (1) able-bodied gait and (2) ambulation involving three different ambulatory aids that can be used during the acute phase of foot and ankle injury care...
April 19, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28416824/-gait-analysis-at-the-early-stage-after-direct-anterior-approach-in-total-hip-arthroplasty
#6
H Y Wang, P D Kang, Y Nie, H Y Zhao, Z Y Yang, F X Pei
OBJECTIVE: To evaluate the result of operation and gait analysis at the early stage after direct anterior approach (DAA) in total hip arthroplasty (THA). METHODS: In this study, 20 patients who suffered from necrosis of femoral head or developmental dysplasia of the hip were scheduled to undergo THA. The basic information and visual analogue scale (VAS) score, Harris score before and after surgery were recorded. All of the patients finished the gait analysis before the surgery and 6 weeks and 12 weeks after the surgery, the data were compared with those of normal adult people...
April 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28409138/range-of-motion-predictability-after-total-knee-arthroplasty-with-medial-pivot-prosthesis
#7
Lúcio Honório de Carvalho Júnior, Bruno Presses Teixeira, Cláudio Otávio da Silva Bernardes, Luiz Fernando Machado Soares, Matheus Braga Jacques Gonçalves, Eduardo Frois Temponi
OBJECTIVE: To assess whether there the final range of motion (ROM) results achieved by patients undergoing total knee arthroplasty (TKA) with prosthesis using Medial Pivot design are predictable. METHODS: Between January and August of 2014, 155 patients with primary osteoarthritis of knee who underwent TKA using the prosthesis ADVANCE(®) Medial Pivot were prospectively assessed. All ROM measures were made and recorded before, during, and after surgery. All patients were clinically assessed preoperatively and postoperatively (15, 45 days, three months, six months, one year, and annually thereafter after surgery); their functional status was assessed using the WOMAC questionnaire...
March 2017: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28409132/do-patients-lose-weight-after-total-knee-replacement
#8
Carlos Roberto Schwartsmann, Alexandre Moreira Borges, Geraldo Luiz Schuck de Freitas, Eduardo Zaniol Migon, Gustavo Kaempf de Oliveira, Marcos Wainberg Rodrigues
OBJECTIVE: Several studies show that patients undergoing total knee arthroplasty (TKA) tend to maintain or gain weight after the procedure, which would result in increased wear of the prosthesis and new surgical interventions in a smaller period of time in comparison with patients with adequate body mass index (BMI). The aim of this study was to investigate the effect of TKA surgery on these patients' BMI. METHODS: Initially the records were analyzed, chosen at random from 91 patients undergoing TKA during the period from August 2011 to July 2013...
March 2017: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28400204/computed-navigated-total-knee-arthroplasty-compared-to-computed-tomography-scans
#9
Ron Batash, Guy Rubin, Alexander Lerner, Hussein Shehade, Nimrod Rozen, David E Rothem
BACKGROUND: Successful total knee arthroplasty (TKA) includes accurate alignment. Controversy remains as to whether computer-navigated TKA improves the overall result and clinical outcome. Our aim is to compare the limb alignment and prosthesis positioning according to the pre- and postoperative computed tomography (CT) scans with the data collected from the navigation system. METHODS: We compared the pre- and postoperative limb alignments and prosthesis alignment provided by the Orthopilot navigation system, Aesculap®, with CT scans measured by the Traumacad® software of 70 TKAs...
April 8, 2017: Knee
https://www.readbyqxmd.com/read/28399722/safety-and-function-of-a-prototype-microprocessor-controlled-knee-prosthesis-for-low-active-transfemoral-amputees-switching-from-a-mechanic-knee-prosthesis-a-pilot-study
#10
Timothy Hasenoehrl, Thomas Schmalz, Reinhard Windhager, Stephan Domayer, Sara Dana, Clemens Ambrozy, Stefano Palma, Richard Crevenna
PURPOSE: Aim of this pilot study was to assess safety and functioning of a microprocessor-controlled knee prosthesis (MPK) after a short familiarization time and no structured physical therapy. MATERIALS AND METHODS: Five elderly, low-active transfemoral amputees who were fitted with a standard non-microprocessor controlled knee prosthesis (NMPK) performed a baseline measurement consisting of a 3 D gait analysis, functional tests and questionnaires. The first follow-up consisted of the same test procedure and was performed with the MPK after 4 to 6 weeks of familiarization...
April 11, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28396931/does-low-constraint-mobile-bearing-knee-prosthesis-give-satisfactory-results-for-severe-coronal-deformities-a-five-to-twelve-year-follow-up-study
#11
Jaroslaw Czekaj, Camdon Fary, Thierry Gaillard, Sebastien Lustig
PURPOSE: Severe varus and valgus knee deformities traditionally are replaced with constrained implants, with a number of disadvantages. We present our results in this challenging group using a low constraint deep-dish mobile bearing implant design. METHODS: One hundred fifty-four patients (170 arthroplasties) who underwent primary TKA using a deep-dish, mobile bearing posterior-stabilized implant for severe varus (HKA < 170°) or valgus (HKA > 190°) deformity between 2004 and 2009 were evaluated at a mean of 6...
April 11, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28392969/preliminary-experiments-with-a-unified-controller-for-a-powered-knee-ankle-prosthetic-leg-across-walking-speeds
#12
David Quintero, Dario J Villarreal, Robert D Gregg
This paper presents the experimental validation of a novel control strategy that unifies the entire gait cycle of a powered knee-ankle prosthetic leg without the need to switch between controllers for different periods of gait. Current control methods divide the gait cycle into several sequential periods each with independent controllers, resulting in many patient-specific control parameters and switching rules that must be tuned for a specific walking speed. The single controller presented is speed-invariant with a minimal number of control parameters to be tuned...
October 2016: Proceedings of the ... IEEE/RSJ International Conference on Intelligent Robots and Systems
https://www.readbyqxmd.com/read/28392915/case-series-report-of-navigation-based-in%C3%A2-vivo-knee-kinematics-in-total-knee-arthroplasty-with-a-gradually-reducing-femoral-radius-design
#13
Hiroshi Takagi, Soshi Asai, Atsushi Sato, Masahiko Maekawa, Humiyoshi Kawashima, Koji Kanzaki
BACKGROUND: Simulations show that paradoxical anterior femoral slide in conventional dual radius total knee arthroplasty (TKA) is initiated by sudden reduction of the femoral radius from distal to posterior. Therefore, we hypothesized that a new TKA prosthesis design with a gradually reducing femoral radius may minimize the anterior slide in navigation-based in vivo knee kinematics. The purpose of this study was to compare the kinematics of TKA in vivo using a prosthesis with a gradually reducing radius, in comparison with the conventional dual radius design...
May 2017: Annals of Medicine and Surgery
https://www.readbyqxmd.com/read/28390886/epidemiology-and-antibiotic-resistance-of-late-prosthetic-knee-and-hip-infections
#14
Lorenzo Drago, Elena De Vecchi, Monica Bortolin, Luigi Zagra, Carlo L Romanò, Laura Cappelletti
BACKGROUND: Prosthetic joint infections (PJI) are still a major complication of hip and knee arthroplasties. Identification of the causative pathogens and knowledge of their antibiotic susceptibilities are essential for the management of these infections. The main purpose of the study was to identify and compare the causative bacteria of prosthetic knee and hip joint infections in a reference Italian orthopedic center and to characterize antibiotic resistance profiles of bacteria involved...
March 15, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28388595/customized-knee-prosthesis-in-treatment-of-giant-cell-tumors-of-the-proximal-tibia-application-of-3-dimensional-printing-technology-in-surgical-design
#15
Wenbin Luo, Lanfeng Huang, He Liu, Wenrui Qu, Xin Zhao, Chenyu Wang, Chen Li, Tao Yu, Qing Han, Jincheng Wang, Yanguo Qin
BACKGROUND We explored the application of 3-dimensional (3D) printing technology in treating giant cell tumors (GCT) of the proximal tibia. A tibia block was designed and produced through 3D printing technology. We expected that this 3D-printed block would fill the bone defect after en-bloc resection. Importantly, the block, combined with a standard knee joint prosthesis, provided attachments for collateral ligaments of the knee, which can maintain knee stability. MATERIAL AND METHODS A computed tomography (CT) scan was taken of both knee joints in 4 patients with GCT of the proximal tibia...
April 7, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28387657/the-importance-of-orthoses-on-activities-of-daily-living-in-patients-with-unilateral-lower-limb-amputations
#16
Sule Sahin Onat, Sibel Ünsal-Delialioğlu, Sumru Özel
BACKGROUND: The role of the selected prothesis on activities of daily living (ADL). OBJECTIVE: To evaluate the impact of prothesis on ADL in patients with lower-limb amputations. METHODS: The data of 500 patients with unilateral lower limb amputation were recorded. The activity level was defined based on the Medicare Functional Classification Level. Old and new prescribed prosthesis were recorded. Nottingham Extended Activities of daily living activities Daily Living Scale was used to evaluate ADL...
March 31, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28386499/total-knee-arthroplasty-in-severe-valgus-osteoarthritis-excellent-early-results-in-a-90-year-old-patient-with-a-valgus-deformity-of-47%C3%A2
#17
Petros Ismailidis, Rolf Kernen, Sebastian Andreas Mueller
Grade III valgus deformity (tibiofemoral alignment > 20°) is present in only 0.5% of patients receiving total knee arthroplasty. Furthermore, cases with a valgus deformity exceeding 40° are even rarer. Since they mostly affect elderly, polymorbid patients, successful outcome means a great challenge. We report on a case of a 90-year-old patient with a valgus deformity of 47°. The patient was preoperatively restricted to a wheel chair, unable to walk, and only able to stand for a few seconds. The maximal knee flexion was 100°, and there was an extension deficit of 15°...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28382211/paraplegia-and-transtibial-amputation-successful-ambulation-after-dual-disability-a-retrospective-case-report
#18
Thangavelu Senthilvelkumar, Bobeena R Chandy
INTRODUCTION: This is a single-subject case report. The objective is to describe the unique rehabilitation outcome of an individual with motor complete T12 paraplegia and a right transtibial amputation. This study was conducted at the Department of Physical Medicine and Rehabilitation of Christian Medical College in India. CASE PRESENTATION: A 42-year-old policeman presented to our rehabilitation centre with motor complete T12 paraplegia and right transtibial amputation, 3 months following a road traffic accident...
2017: Spinal Cord Series and Cases
https://www.readbyqxmd.com/read/28376828/all-polyethylene-tibial-components-in-distal-femur-limb-salvage-surgery-a-finite-element-analysis-based-on-promising-clinical-outcomes
#19
Fan Tang, Yong Zhou, Wenli Zhang, Li Min, Rui Shi, Yi Luo, Hong Duan, Chongqi Tu
BACKGROUND: Whether all-polyethylene tibial (APT) components are beneficial to patients who received distal femur limb-salvage surgery lacks high-quality clinical follow-up and mechanical evidence. This study aimed to investigate the biomechanics of the distal femur reconstructed with APT tumor knee prostheses using finite element (FE) analysis based on our previous, promising clinical outcome. METHODS: Three-dimensional FE models that use APT and metal-backed tibial (MBT) prostheses to reconstruct distal femoral bone defects were developed and input into the Abaqus FEA software version 6...
April 4, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28371503/effect-of-femoral-component-flexion-implantation-on-the-mediolateral-bone-prosthetic-fit-in-total-knee-arthroplasty
#20
Shi-Chang Chen, Yi-Ming Zeng, Meng-Ning Yan, Bing Yue, Jun Zhang, You Wang
OBJECTIVE: Femoral component overhang in total knee arthroplasty (TKA) has been reported in previous studies. The purpose of this study was to evaluate the effect of femoral component flexion implantation on mediolateral bone-prosthetic fit in TKA. METHODS: Virtual prosthesis implantations were performed on computed tomographic models of 10 Chinese knees with femoral prostheses of the Advance Medial-Pivot knee system (MicroPort Orthopedics, Arlington, TN, USA), with the femoral component positioned at 0°, 3°, or 6° of flexion in the sagittal plane...
February 2017: Orthopaedic Surgery
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