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Shaun P Patel, Valentin Antoci, John J Kadzielski, Mark S Vrahas
Arthroplasty implant fracture is a rare but critical complication that requires difficult revision surgery, often with poor results, patient disability, and significant cost. Several reports show component fracture either at the stem or at the neck interface after a relatively short postoperative course. We report such failure after 12 years, suggesting no safe period after which femoral implant fracture does not occur.
2016: Case Reports in Orthopedics
Christopher P Roche, Matthew A Hamilton, Phong Diep, Thomas W Wright, Pierre-Henri Flurin, Joseph D Zuckerman, Howard D Routman
INTRODUCTION: Paul Grammont's hemispherical gleno sphere concept medializes the center of rotation (CoR) to the glenoid face to increase deltoid abductor moment arms and improve muscle efficiency. Reducing glenosphere thickness to less than half its spherical radius further medializes the CoR and offers the potential for even greater improvements in efficiency. To that end, this study quantifies deltoid abducttor moment arms for six different rTSA prostheses during scapular abduction from 0° to 140°...
December 2015: Bulletin of the Hospital for Joint Diseases
Emmon J Chen, Ryan Simovitch, Felix Savoie, Curtis R Noel
INTRODUCTION: Humeral head resurfacing has been described as a more anatomic replacement alternative for proximal humerus arthroplasties when compared to conventional stemmed implants. However, not all studies show that humeral head resurfacing is better at reproducing the proximal humeral anatomy with overstuffing of the joint being a common complication. The purpose of this study was to assess the use of the anatomic neck as a landmark for proper placement of humeral head replacements...
December 2015: Bulletin of the Hospital for Joint Diseases
Maire-Clare Killen, Suzanne Lane, Charalambos P Charalambous
BACKGROUND: Reported outcomes of shoulder hemiarthroplasty for proximal humeral fractures have been poor due to tuberosity non-union or rotator cuff disruption. Newer designs provide features to allow secure tuberosity apposition and stabilisation. To evaluate the outcomes of a shoulder hemiarthroplasty system with "tuberosity friendly" features in the treatment of multi-fragmentary proximal humeral fractures. MATERIAL AND METHODS: An analysis of 12 patients undergoing Exactech Equinoxe hemiarthroplasty for proximal humeral fractures over a two year period...
March 2015: Ortopedia, Traumatologia, Rehabilitacja
Joseph J King, Kevin W Farmer, Aimee M Struk, Thomas W Wright
PURPOSE: This study compares the radiographic and functional outcomes of uncemented and cemented humeral fixation in reverse total shoulder arthroplasty (RTSA). METHODS: A prospective research database was reviewed for RTSA patients from 2007 to 2010. Inclusion criteria were primary RTSA from one manufacturer (Exactech Equinoxe®) with a grit-blasted metaphyseal humeral stem and two year minimum follow-up. Exclusion criteria included shoulder arthroplasty for fractures, fracture sequelae or inflammatory arthropathy...
February 2015: International Orthopaedics
Hilmar Teschner, Urs-Vito Albrecht, Rupert Meller, Emmanouil Liodakis, Ulrich Wiebking, Christian Krettek, Michael Jagodzinski
PURPOSE: Cranial migration of shoulder hemiarthroplasties due to rotator cuff insufficiency typically requires conversion into a reverse total shoulder arthroplasty. This study was conducted to analyze differences between the height and offset of six implants designed to enable conversion of a hemiarthroplasty into a reverse system. METHODS: Anteroposterior radiographs of 40 shoulders were taken. An image analyzing software was used to simulate the implantation of the hemiprostheses...
December 2014: Archives of Orthopaedic and Trauma Surgery
Susannah L Gilbert, Adam J Rana, Joseph D Lipman, Timothy M Wright, Geoffrey H Westrich
BACKGROUND: The Optetrak PS (Exactech, Inc., Gainesville, FL) has been a well-functioning posterior stabilized knee replacement since its introduction in 1995. In 2009, the Optetrak Logic incorporated modifications to the anterior face of the tibial post and the corresponding anterior articulating surface of the femoral component to reduce edge loading on the polyethylene post. In this study, we provide the rationale for the design change and compare the damage on retrieved tibial components of both designs to demonstrate the effectiveness of the design modifications in decreasing post damage...
December 2014: Knee
Christopher P Roche, Phong Diep, Matthew A Hamilton, Pierre-Henri Flurin, Howard D Routman
INTRODUCTION: A computer model quantified glenoid base - plate surface contact area and the amount of humeral and glenoid bone removed by three different reverse shoulder prosthesis designs when implanted with various techniques. METHODS: The computer model quantified differences in glenoid baseplate contact area and the cortical and cancellous humeral and glenoid bone removed to implant the 36 mm Depuy Delta III, 32 mm neutral DJO RSP, and the 38 mm Exactech Equinoxe reverse shoulders when each was implanted along the inferior glenoid rim of a normal and 10 mm medially eroded scapula in 20° of humeral retroversion...
2013: Bulletin of the Hospital for Joint Diseases
Rodrigo García-Crespo, Fernando Marco, Luis Enrique Moro, Gloria Ariza, Rafael Luque, Luis López-Durán
A clinical study has been carried out on 434 posterior-stabilized knee prostheses (Optetrak; Exactech, Gainesville, Fla) implanted between 1995 and 2000 in a university general hospital by 23 surgeons. At a mean follow-up of 8.8 years, 297 knees in 249 patients were available for review. Average patient age at surgery was 71.8 years. Average body mass index was 28.8 kg/m(2). Mean flexion range was 108° .The average knee score (Hospital for Special Surgery) increased from 48 points preoperatively to 86 points (60-97 points) at the final review...
December 2011: Journal of Arthroplasty
Venkata Gurava Reddy, Aditya Krishna Mootha, Chiranjeevi Thayi, Pareen Kantesaria, Ramireddy Vinodh Kumar, Divakar Reddy
BACKGROUND: Variations in the anatomy of knee are well described, however the true incidence of component asymmetry in bilateral total knee arthroplsties is rarely reported. Incidence of component asymmetry in bilateral total knee arthroplasties (TKA) was retrospectively analysed in 289 cruciate retaining total knee arthroplasties. MATERIALS AND METHODS: Medical records of these 289 patients were evaluated for the incidence of asymmetry of either femoral or tibial components...
May 2011: Indian Journal of Orthopaedics
Mark M Dolan, Natalie H Kelly, Joseph T Nguyen, Timothy M Wright, Steven B Haas
BACKGROUND: The tibial post in posterior-stabilized total knees is a potential source of polyethylene wear debris, but the relationship between the shape and location of the tibial post in relation to the tibiofemoral bearing surfaces and the subsequent wear damage patterns remains unknown. QUESTIONS/PURPOSES: We used observations made on retrieved implant components from three contemporary posterior-stabilized knee designs to examine how differences in tibial post design affected wear damage on the post...
January 2011: Clinical Orthopaedics and related Research
C Roche, L Angibaud, P H Flurin, T Wright, E Fulkerson, Joseph Zuckerman
An anatomic study was conducted on 49 dried cadaveric humeri and 24 dried cadaveric scapula to ascertain the variability of the following parameters: humeral neck angle, humeral head retroversion, humeral head medial offset, humeral head posterior offset, humeral head diameter glenoid height, glenoid width, and the glenoid height to width ratio. For verification purposes, the results of this study were found to be within 1.5% to 14.3% of other anatomic studies published in the literature. This observed variability was then compared to that provided by an "anatomic" shoulder prosthesis (Equinoxe, Exactech, Inc...
2006: Bulletin
Carlos A Higuera, George Hanna, Karen Florjancik, D Gordon Allan, Raymond Robinson, Wael K Barsoum
Proximally fixed femoral stems in revision of total hip arthroplasties (THAs) have had inconsistent results. Our aim was to determine the safety and efficacy of a new proximally fixed modular stem in THA revision. Fifty-three patients underwent THA revision with the Exactech AccuMatch M-Series (Gainesville, Fla) modular stem and were followed up prospectively for an average of 2.5 years with preoperative and postoperative Harris Hip Score and SF-12 scores. A small number of complications were reported. One stem was revised within 4 weeks due to subsidence...
June 2006: Journal of Arthroplasty
Lisa Berti, Maria Grazia Benedetti, Andrea Ensini, Fabio Catani, Sandro Giannini
BACKGROUND: Currently there is a limited understanding of the factors influencing range of motion by comparing patellar resurfacing vs non-resurfacing in total knee arthroplasty during activities of daily living. A recent meta-analysis of patellar replacement confirms better outcome with patella resurfacing; however, the result can be influenced by many other factors, such as: component design, surgeon experience, and technical aspects of the surgery. This study compares the biomechanics of the knee in patients after total knee arthroplasty with and without patellar resurfacing during stair climbing...
July 2006: Clinical Biomechanics
Nigel J Forrow, Stephen J Walters
Chromium and manganese half-sandwich complexes are evaluated as mediators to glucose oxidase (GOx) since they are of similar size to ferrocene derivatives (sandwich complexes) and contain a single pi-ligand for interaction with the enzyme co-factor. A series of seven amino derivatives of [(eta-C(6)H(6))Cr(CO)(3)] were investigated of which only [[eta-C(6)Me(4)(NH(2))(2)]Cr(CO)(3)] (7), with the lowest oxidation potential of +40 mV (versus SCE), was found to display reversible electrochemistry. Small catalytic currents were recorded in the presence of GOx and glucose when complex (7) was incorporated in a screen-printed carbon electrode...
February 15, 2004: Biosensors & Bioelectronics
Bogdan Solnica, Jerzy W Naskalski, Jacek Sieradzki
BACKGROUND: Glucometry is an essential part of diabetes treatment, but so far, no standard quality control procedure verifying blood glucose meter results is available. In this study, we evaluated the analytical performance of eight glucose meters: GX and Esprit (Bayer Diagn.), MediSense Card Sensor, ExacTech (MediSense) with strips Selfcare (Cambridge Diagn), One Touch Basic, One Touch II, One Touch Profile (Lifescan) and Glucotrend (Boehringer Mannheim/Roche). METHODS: The evaluation included within-run imprecision, linearity, comparison with the laboratory method and calculation of differences between individual glucometers...
May 2003: Clinica Chimica Acta; International Journal of Clinical Chemistry
E A Bartkus, M Daya, J R Hedges, J Jui
INTRODUCTION: Current prehospital protocols for the management of patients with altered mental status include the empiric administration of hypertonic glucose, naloxone, and thiamine. The injudicious use of 50% dextrose (D50W) may result in hyperosmolarity, a worsening of hypokalemia, and unwarranted additional health-care costs for the patient. The administration of D50W also may worsen the neurological outcome of patients with local or generalized ischemia. OBJECTIVE: To evaluate the ExacTech blood glucose meter's ability to estimate blood glucose levels accurately and rapidly...
July 1993: Prehospital and Disaster Medicine
E Moberg, S Lundblad, P E Lins, U Adamson
Comparisons were made between four blood-glucose meters (Diascan, Glucometer II, Reflolux II and ExacTech) and a reference method (YSI) for the full, clinical, blood-glucose range and for the subranges < 4.4 mmol/l, 4.4-10.0 mmol/l and > 10.0 mmol/l, respectively. In the low-glucose range, the error-grid analysis was also applied. All the meters showed acceptable agreement with the reference method when the whole glucose range was considered, yielding r-values between 0.96 and 0.99. However, when the results were separated in the different subranges, the outcome was different, in that the Diascan meter displayed systematically high glucose levels and the ExacTech meter showed a great spread of the values within the low-glucose range, whereas the Glucometer II and the Reflolux II meter were less accurate within the high-glucose range...
March 1993: Diabetes Research and Clinical Practice
E S Kilpatrick, A G Rumley, E A Smith
A study was conducted to assess the effect of changes in sample pH and pO2 on the Accutrend, ExacTech Companion, Glucometer II, One Touch II, and Refloflux II blood glucose meters. Venous blood was tonometered after the addition of strong acid or alkali to produce 10 samples with a pH range of 6.54 to 7.73 but with a similar mean pO2 (9.09 +/- 0.096 (SEM) kPa) and pCO2 (5.52 +/- 0.024 kPa). The ExacTech showed a > 15% deviation from the value obtained at pH 7.40 below pH 6.95 and above pH 7.85 (r = 0.69, p = 0...
June 1994: Diabetic Medicine: a Journal of the British Diabetic Association
M E Price, C Hammett-Stabler, G B Kemper, M G Davis, E H Piepmeier
Diabetic patients may experience fluctuations in whole blood glucose (WBG) levels while receiving hyperbaric oxygen therapy (HBO) resulting in seizure-like activity. Therefore, hyperbaric medical attendants must accurately monitor the WBG levels of these patients during HBO. In addressing this concern, this study evaluated the accuracy and reliability of commercially available glucometers (Glucometer M+, Companion 2, HemoCue, One Touch II, and ExacTech Pen) in the hyperbaric environment. WBG samples were prepared, ranging from 25 to 250 mg/dl, for testing glucometers at ground level and at 2...
March 1995: Military Medicine
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