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https://www.readbyqxmd.com/read/29338761/is-total-femoral-replacement-for-non-oncologic-and-oncologic-indications-a-safe-procedure-in-limb-preservation-surgery-a-single-center-experience-of-22-cases
#1
Andreas Toepfer, Norbert Harrasser, Isabel Petzschner, Florian Pohlig, Ulrich Lenze, Ludger Gerdesmeyer, Ruediger von Eisenhart-Rothe, Heinrich Mühlhofer, Christian Suren
BACKGROUND: Several surgical options for the reconstruction of massive bone defects have been described and include biologic methods with autografts and allografts, and the use of tumor endoprostheses (total femoral replacement, TFR). Several types of modular TFR are available, but nevertheless unpredictable outcomes and high complication rates have been described from most authors. The present study aims to compare results after TFR performed with modular total femur prosthesis MML (Fa...
January 16, 2018: European Journal of Medical Research
https://www.readbyqxmd.com/read/29332662/a-survivorship-study-of-838-total-elbow-replacements-a-report-from-the-norwegian-arthroplasty-register-1994-2016
#2
Yngvar Krukhaug, Geir Hallan, Eva Dybvik, Stein A Lie, Ove N Furnes
BACKGROUND: The aim of this study was to present the long-term survivorship (20 years) of total elbow arthroplasty (TEA) for a relatively large population and to compare different prosthesis brands and patient subgroups. METHODS: Between 1994 and 2017, a total of 838 primary TEAs were reported to the Norwegian Arthroplasty Register. Implant survival was calculated using the Kaplan-Meier method. Risk differences were examined using Cox regression analyses and exact Cox regression for rare events...
February 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29324457/successful-first-gait-of-a-child-with-hip-disarticulation-prosthesis-a-case-report
#3
Hitomi Hara, Teruya Kawamoto, Naomasa Fukase, Etsuko Katayama, Toshiyuki Takemori, Shuichi Fujiwara, Yoshitada Sakai, Kotaro Nishida, Ryosuke Kuroda, Toshihiro Akisue
An infant boy underwent hip disarticulation for infantile fibrosarcoma immediately after birth. His rehabilitation began when he was 4 months old and involved training with his left (residual) leg. He could stand with support at 12 months. His initial prosthesis fitting was performed at the age of 13 months. He could stand and walk with support at 15 months of age and could walk with no additional support and go up and down stairs at 2 years. A single-axis prosthetic knee joint was introduced at the age of 2 years 3 months...
January 11, 2018: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/29312854/antibiotic-bone-cement-s-effect-on-infection-rates-in-primary-and-revision-total-knee-arthroplasties
#4
Donald Kleppel, Jacob Stirton, Jiayong Liu, Nabil A Ebraheim
AIM: To compare infection rates in primary and revision total knee arthroplasty (TKA) procedures using antibiotic impregnated bone cement (AIBC) to those rates in procedures not using AIBC. METHODS: A systematic review and meta-analysis was conducted in search for randomized controlled trials/studies (RCTs) pertaining to the field of antibiotic AIBC vs non-AIBC groups in both primary and revision TKA procedures. The primary literature search performed was to identify all RCTs that assessed AIBC in primary and revision TKA procedures...
December 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/29310921/does-patients-perception-of-leg-length-after-total-hip-arthroplasty-correlate-with-anatomical-leg-length
#5
Jean Y Lazennec, Dominique Folinais, Caroline Florequin, Aidin E Pour
BACKGROUND: This study assessed the correlation among the patients' perception of the leg length discrepancy (LLD) after total hip arthroplasty (THA) and the anatomical and functional leg length, pelvic and knee alignments, and foot height. METHODS: Patients without significant spinal pathology or previous spine or lower extremity surgery who underwent primary THA (101 patients) were evaluated using EOS images obtained in standing position. All 3-dimensional measures were evaluated and compared for the repeatability and reproducibility and correlation with patients' perception of leg length...
December 13, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29305449/mid-term-results-of-lateral-unicondylar-mobile-bearing-knee-arthroplasty-a-multicentre-study-of-363-cases
#6
T Walker, N Zahn, T Bruckner, M R Streit, G Mohr, P R Aldinger, M Clarius, T Gotterbarm
AIMS: The aim of this independent multicentre study was to assess the mid-term results of mobile bearing unicondylar knee arthroplasty (UKA) for isolated lateral osteoarthritis of the knee joint. PATIENTS AND METHODS: We retrospectively evaluated 363 consecutive, lateral UKAs (346 patients) performed using the Oxford domed lateral prosthesis undertaken in three high-volume knee arthroplasty centres between 2006 and 2014. Mean age of the patients at surgery was 65 years (36 to 88) with a mean final follow-up of 37 months (12 to 93) RESULTS: A total of 36 (10...
January 2018: Bone & Joint Journal
https://www.readbyqxmd.com/read/29299472/does-a-simple-syringe-applicator-enhance-bone-cement-set-up-time-in-knee-arthroplasty
#7
Nipun Sodhi, Sarah E Dalton, Anton Khlopas, Assem A Sultan, Gannon L Curtis, Matthew A Harb, Qais Naziri, Jared M Newman, John W Barrington, Michael A Mont
Background: The time required for polymethylmethacrylate (PMMA) cement curing or hardening can be modified by a number of variables including the mixing technique, and the temperature and pressure at which the process is taking place. Therefore, the purpose of this study was to evaluate two different methods of PMMA application in terms of set up time. Specifically, we (I) compared the PMMA set up time of cement that remained in the mixing bowl to cement that was placed in a syringe and (II) extrapolated the associated annual cost difference on the national and individual surgeon levels...
December 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/29298695/vub-cyberlegs-cybathlon-2016-beta-prosthesis-case-study-in-control-of-an-active-two-degree-of-freedom-transfemoral-prosthesis
#8
Louis L Flynn, Joost Geeroms, Tom van der Hoeven, Bram Vanderborght, Dirk Lefeber
BACKGROUND: Here we present how the CYBERLEGs Beta-Prosthesis was modified with a new control system to participate in the Powered Leg Prosthesis event, and to report on our experience at the CYBATHLON 2016 which was held in Zurich, Switzerland in October 2016. The prosthesis has two active degrees of freedom which assist the user with extra joint power at the knee and ankle to complete tasks. The CYBATHLON is a championship for people with disabilities competing in six disciplines, using advanced assistive devices...
January 3, 2018: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29291158/antibiotic-prophylaxis-and-dair-treatment-in-primary-total-hip-and-knee-arthroplasty-a-national-survey-in-the-netherlands
#9
Ewout S Veltman, Dirk Jan F Moojen, Rob Ghh Nelissen, Rudolf W Poolman
BACKGROUND: To prevent postoperative infection the use of systemic antibiotic prophylaxis is common ground. Type of antibiotic used and duration of prophylaxis are subject to debate. In case of suspected early periprosthetic infection a debridement, antibiotics and implant retention (DAIR) procedure is treatment of first choice. This study evaluated the antibiotic prophylaxis and DAIR treatment protocols nationwide as well as reporting of these DAIR procedures to the national joint registry...
2018: Journal of Bone and Joint Infection
https://www.readbyqxmd.com/read/29282486/patient-specific-instrumentation-in-oxford-unicompartmental-knee-arthroplasty-is-reliable-and-accurate-except-for-the-tibial-rotation
#10
B Kerens, A M Leenders, M G M Schotanus, B Boonen, W E Tuinebreijer, P J Emans, B Jong, N P Kort
PURPOSE: Patient-specific instrumentation (PSI) is a technique to plan and position the prosthesis components in unicompartmental knee arthroplasty (UKA) surgery. This study assesses whether the definitive component position in the frontal, sagittal and axial plane is according to the preoperative plan, based on the hypothesis that PSI is accurate. METHODS: Twenty-six patients who had PSI Oxford UKA surgery were included prospectively. The component position in vivo was determined with a postoperative CT-scan and compared with the planned component position using MRI-based digital 3D imaging...
December 27, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29280006/minimally-invasive-unicompartmental-knee-arthroplasty
#11
REVIEW
Jean-Yves Jenny
The exact indication for a unicompartmental knee arthroplasty (UKA) remains debated. Minimally invasive techniques have been developed to decrease the surgical trauma related to the prosthesis implantation, and this technique is well fitted to UKA. However, there are concerns about loss of accuracy with minimally invasive techniques. Furthermore, rapid recovery techniques have been developed in order to reduce the length of hospital stay. Again, UKA is well fitted to these new developments of postoperative care...
December 26, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/29276305/stable-robust-hybrid-zero-dynamics-control-of-powered-lower-limb-prostheses
#12
Anne E Martin, Robert D Gregg
To improve the quality of life for lower-limb amputees, powered prostheses are being developed. Advanced control schemes from the field of bipedal robots, such as hybrid zero dynamics (HZD), may provide great performance. HZD-based control specifies the motion of the actuated joints using output functions to be zeroed, and the required torques are calculated using input-output linearization. For one-step periodic gaits, there is an analytic metric of stability. To apply HZD-based control on a powered prosthesis, several modifications must be made...
August 2017: IEEE Transactions on Automatic Control
https://www.readbyqxmd.com/read/29276117/a-retrospective-comparison-of-a-medial-pivot-and-posterior-stabilized-total-knee-arthroplasty-with-respect-to-patient-reported-and-radiographic-outcomes
#13
David A Samy, Jesse I Wolfstadt, Iman Vaidee, David J Backstein
BACKGROUND: Medial pivot (MP) type total knee arthroplasty (TKA) implants are designed with a highly congruent medial tibiofemoral articulation. Compared with the cam-and-post design of the posterior-stabilized (PS) TKA, the MP-TKA design has been hypothesized to better replicate the natural kinematics of the knee. We compared the MP-TKA and PS-TKA designs, with our primary outcome measures being range of motion (ROM) and patient-reported satisfaction. METHODS: This study was a retrospective comparison between the 2 groups (76 MP-TKA vs 88 PS-TKA)...
December 7, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29273898/pseudo-patella-baja-a-minor-yet-frequent-complication-of-total-knee-arthroplasty
#14
Giulia Bugelli, Francesco Ascione, Niki Cazzella, Edoardo Franceschetti, Francesco Franceschi, Giacomo Dell'Osso, Eleonor Svantesson, Kristian Samuelsson, Stefano Giannotti
PURPOSE: One of the complications in total knee arthroplasty (TKA) is pseudo-patella baja (PPB). PPB is present when there is no shortening of the patellar tendon, but the joint line is elevated. The purpose of this study is to investigate the incidence of PPB after TKA and its clinical effects. METHODS: A case series of 158 patients undergoing TKA surgery between 1999 and 2012 at the 2nd Department of Orthopaedics and Traumatology, Pisa were retrospectively reviewed...
December 23, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29250661/effects-of-malalignment-angle-on-the-contact-stress-of-knee-prosthesis-components-using-finite-element-method
#15
Daniela TarniŢă, Dan Marian Calafeteanu, IonuŢ Daniel Geonea, Alin Petcu, DănuŢ Nicolae TarniŢă
In this paper, the complex 3D virtual model of the prosthetic knee is obtained using embedded applications: DesignModeler and SpaceClaim under ANSYS Workbench 14.5 software package. A number of six cases of prosthetic knee joint assembly, depending on the malalignment angle, are developed. Stress maps and the values of the maximum von Mises stress on the three prosthesis components: polyethylene insert, tibial component and femoral component, for all studied prosthetic knee assemblies were obtained. The results show that as the malalignment angle increases, the values of von Mises stresses increase in all prosthesis components...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/29248485/uncemented-vs-cemented-cruciate-retaining-total-knee-arthroplasty-in-patients-with-body-mass-index-greater-than-30
#16
K Keely Boyle, Scott R Nodzo, Joseph T Ferraro, David J Augenblick, Sonja Pavlesen, Matthew J Phillips
BACKGROUND: Aseptic loosening of cemented and uncemented tibial components continues to be a source of implant failure after total knee arthroplasty (TKA) in the obese population. There is limited literature reviewing uncemented cruciate retaining (CR) components in the obese population. METHODS: A clinical and radiographic review was performed on 325 patients who underwent a cemented or uncemented TKA with a CR knee prosthesis and body mass index ≥30 kg/m2 between January 2010 and June 2013...
December 1, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29244685/mycobacterium-cosmeticum-infection-after-total-knee-arthroplasty-a-case-report
#17
Emil Stefan Vutescu, Karl M Koenig
CASE: A 67-year-old immunocompetent man presented with a periprosthetic infection 4 months after a left total knee arthroplasty. Repeated aspirations failed to show any organism growth. After irrigation and debridement with polyethylene exchange, there was minimal clinical improvement. Subsequently, the patient developed an arthrocutaneous fistula, which prompted a 2-stage revision arthroplasty. Mycobacterium cosmeticum grew on the culture specimens taken during this procedure, and the patient was treated with 6 months of antibiotics...
January 2017: JBJS Case Connector
https://www.readbyqxmd.com/read/29244223/fixed-bearing-medial-unicompartmental-knee-arthroplasty-restores-neither-the-medial-pivoting-behavior-nor-the-ligament-forces-of-the-intact-knee-in-passive-flexion
#18
Mohammad Kia, Lucian C Warth, Joseph D Lipman, Timothy M Wright, Geoffrey H Westrich, Michael B Cross, David J Mayman, Andrew D Pearle, Carl W Imhauser
Medial unicompartmental knee arthroplasty (UKA) is an accepted treatment for isolated medial osteoarthritis. However, using an improper thickness for the tibial component may contribute to early failure of the prosthesis or disease progression in the unreplaced lateral compartment. Little is known of the effect of insert thickness on both knee kinematics and ligament forces. Therefore, a computational model of the tibiofemoral joint was used to determine how non-conforming, fixed bearing medial UKA affects tibiofemoral kinematics and tension in the medial collateral ligament (MCL) and the anterior cruciate ligament (ACL) during passive knee flexion...
December 15, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29232186/cemented-or-cementless-total-knee-arthroplasty-comparative-results-of-200-cases-at-a-minimum-follow-up-of-11-years
#19
Jean-Louis Prudhon, Régis Verdier
INTRODUCTION: Since 1996 we have been using cementless fixation with hydroxyapatite (HA) coating. The purpose of this paper is to compare survivorship of a series of 100 cemented Total Knee Arthroplasty (TKA) to a similar series of 100 cementless with a follow up of 11-16 years. Material methods: Both TKA are mobile bearing total knee postero-stabilized. They can be used with cement or without cement. Among 1030 New Wave TKATM implanted from 2002 to 2015 we have identified 100 cemented TKAs and 100 cementless TKAs...
2017: SICOT-J
https://www.readbyqxmd.com/read/29226201/acute-primary-total-knee-arthroplasty-for-proximal-tibial-fractures-in-elderly
#20
Mohammad M Sarzaeem, Mohammad M Omidian, Gholamhossein Kazemian, Alireza Manafi
Background: Proximal tibial fractures in elderly patients with osteoporosis or knee osteoarthritis (OA) are challenging cases. In the current study, we present our experience with uncommon acute primary total knee arthroplasty (PTKA) in this patient population. Methods: PTKAs were performed following proximal tibial fractures in 30 consecutive patients over 60 years of age with osteoporosis or knee OA between 2005 and 2009. Three constrained condylar knees (CCK) and no hinged knee prosthesis were used...
September 2017: Archives of Bone and Joint Surgery
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