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https://www.readbyqxmd.com/read/28922701/unicortical-and-bicortical-plating-in-the-fixation-of-comminuted-fractures-of-the-clavicle-a-biomechanical-study
#1
John M Looft, Lincoln Corrêa, Minoo Patel, Mathew Rawlings, David C Ackland
BACKGROUND: Intraoperative neurovascular complications with clavicle fracture fixation are often due to far cortex penetration by drills and screws, but could be avoided using a unicortical construct. The objective of this study was to compare the bending and torsional strength of a unicortical locking screw plate construct and a hybrid (with central locked and outer non-locked long oblique screws) unicortical plate construct for clavicle fracture fixation with that of a conventional bicortical locking screw construct of plate fixation...
September 18, 2017: ANZ Journal of Surgery
https://www.readbyqxmd.com/read/28884096/finite-element-analysis-of-the-equivalent-stress-distribution-in-schanz-screws-during-the-use-of-a-femoral-fracture-distractor
#2
Vincenzo Giordano, Alexandre Leme Godoy-Santos, William Dias Belangero, Robinson Esteves Santos Pires, Pedro José Labronici, Hilton Augusto Koch
To evaluate the mechanical stress and elastic deformation exercised in the thread/shaft transition of Schanz screws in assemblies with different screw anchorage distances in the entrance to the bone cortex, through the distribution and location of tension in the samples. An analysis of 3D finite elements was performed to evaluate the distribution of the equivalent stress (triple stress state) in a Schanz screw fixed bicortically and orthogonally to a tubular bone, using two mounting patterns: (1) thread/shaft transition located 20 mm from the anchorage of the Schanz screws in the entrance to the bone cortex and (2) thread/shaft transition located 3 mm from the anchorage of the Schanz screws in entrance to the bone cortex...
June 2017: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28866146/rehabilitation-of-the-atrophic-mandible-with-short-implants-in-different-positions-a-finite-elements-study
#3
Hugo E Peixoto, Paulo R Camati, Fernanda Faot, Bruno S Sotto-Maior, Elizabeth F Martinez, Daiane C Peruzzo
OBJECTIVE: The aim of this study was to analyze whether the use of inclined short implants without lower transcortical involvement (test model - SI), thus preserving the mandibular lower cortical bone, could optimize stress distribution. MATERIALS AND METHODS: Six identical atrophic mandible models were created featuring 8mm of height at the symphysis. Two study factors were evaluated: implant length and angulation. Implant length was represented either by short implants (7mm) with preservation of the mandibular lower cortical bone or standard implants (9mm) with a bicortical approach and 3 possible implant positioning configurations: 4 distally-inclined implants at 45° (experimental model), all-on-four, 4 vertical implants...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28822222/biomechanical-comparison-of-a-novel-monocortical-and-two-common-bicortical-external-fixation-systems-regarding-rigidity-and-dynamic-stability
#4
Patrick A Varady, Markus Greinwald, Peter Augat
AIM: To biomechanically compare a monocortical single frame external fixator (Orthofix UNYCO) with two bicortical fixator systems (dual frame: Stryker Hoffmann and single frame: Synthes LEF) with respect to system rigidity and stability under cyclic loading. METHODS: The fixator systems were assessed for axial rigidity under loads which would occur clinically during fixator application and dynamic stability (cyclic fatigue) under loads which would occur in the first week postoperatively...
August 19, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28821936/minimally-invasive-plate-augmentation-in-the-treatment-of-long-bone-non-unions
#5
Ki-Chul Park, Chang-Wug Oh, Joon-Woo Kim, Kyeong-Hyeon Park, Jong-Keon Oh, Il-Hyung Park, Hee-Soo Kyung, Jeong Heo
INTRODUCTION: Exchange nailing is most acceptable for treating hypertrophic non-union of the long bones, requiring the removal of previously fixed implant. However, its main effect of mechanical stabilization is controversial in non-isthmal area. We hypothesized that minimally invasive plate augmentation over the non-union site may have a better option, without the need of bone grafting or removing pre-existing implants. MATERIALS AND METHODS: Seventeen patients with hypertrophic non-union of the long bones between 2010 and 2014 on radiography who previously underwent intramedullary (IM) nailing or plate osteosynthesis for long-bone fractures were included...
August 18, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28818322/stability-of-biodegradable-metal-mg-ca-zn-alloy-screws-compared-with-absorbable-polymer-and-titanium-screws-for-sagittal-split-ramus-osteotomy-of-the-mandible-using-the-finite-element-analysis-model
#6
Jee-Ho Lee, Hyung-Seop Han, Yu-Chan Kim, Jin-Yong Lee, Bu-Kyu Lee
Mg-Ca-Zn alloy has been suggested for the application of fixation materials during maxillofacial surgery. We investigated the stability of Mg-Ca-Zn alloy for clinical application during orthognathic surgery. The finite element model for the fixation of sagittal split ramus osteotomy was constructed. In the bicortical screw fixation of the mandible setback condition, the stress distributions of Mg-Ca-Za alloy, polylactic acid polymer, and titanium were evaluated using the virtual model with occlusal loading of 132 N...
July 4, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28817191/pullout-strength-of-2-0-mm-cancellous-and-cortical-screws-in-synthetic-bone
#7
John E Moser, Kevin A R Kunkel, Patrick D Gerard
OBJECTIVE: To determine whether 2.0 mm cancellous screws are superior to 2.0 mm cortical screws when inserted into cancellous and bicortical bone. STUDY DESIGN: Biomechanical study. METHODS: The 2.0 mm cancellous screws and 2.0 mm cortical screws were inserted according to the recommended guidelines in synthetic cancellous and bicortical blocks. Fifteen screw-block constructs per group were tested to failure in axial pullout. Axial pullout strength and yield strength were calculated...
August 17, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28812035/bioabsorbable-versus-metal-screw-in-the-fixation-of-tibial-tubercle-transfer-a-cadaveric-biomechanical-study
#8
Janne T Nurmi, Ari Itälä, Raine Sihvonen, Petri Sillanpää, Pekka Kannus, Harri Sievänen, Teppo L N Järvinen
BACKGROUND: In tibial tubercle transfer (TTT) procedures, the osteotomized and transferred tibial tubercle is usually fixed into the host bone using metal screws. PURPOSE: To compare the strength of fixation provided by a single bioabsorbable screw versus a metal screw for TTT. STUDY DESIGN: Controlled laboratory study. METHODS: Twenty-two pairs of human cadaveric tibiae were used to compare the fixation strength of a single 4...
July 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28764289/evaluation-of-donor-site-morbidity-associated-with-iliac-crest-bone-harvest-in-oral-and-maxillofacial-reconstructive-surgery
#9
K N V Sudhakar, Rajat Mohanty, Vaibhav Singh
INTRODUCTION: Iliac crest is the most common donor site for autogenous bone grafting as cortical bone, cancellous bone or combination of both can be harvested in abundance depending upon the need. Ilium provides highest concentration of osteo-component cells and greater quality of bone with less morbidity. AIM: The study was conducted to evaluate the donor site morbidity associated with autogenous iliac crest bone grafting for reconstruction in maxillofacial surgery...
June 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28708909/biomechanical-three-dimensional-finite-element-analysis-of-single-implant-supported-prostheses-in-the-anterior-maxilla-with-different-surgical-techniques-and-implant-types
#10
Fellippo Ramos Verri, Joel Ferreira Santiago, Daniel Augusto Almeida, Victor Eduardo de Souza Batista, Cleidiel Aparecido Araujo Lemos, Caroline Cantieri Mello, Eduardo Piza Pellizzer
PURPOSE: The aim of this study was to use three-dimensional finite element analysis to analyze the stress distribution transferred by single implant-supported prostheses placed in the anterior maxilla using different connections (external hexagon, internal hexagon, or Morse taper), inclinations of the load (0, 30, or 60 degrees), and surgical techniques for placement (monocortical/conventional, bicortical, or bicortical with nasal floor elevation). MATERIALS AND METHODS: Nine models representing a bone block of this region were simulated by computer-aided design software (InVesalius, Rhinoceros, SolidWorks)...
July 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28688826/biomechanical-analysis-of-latarjet-screw-fixation-comparison-of-screw-types-and-fixation-methods
#11
Jason J Shin, Jason T Hamamoto, Timothy S Leroux, Maristella F Saccomanno, Akshay Jain, Mahmoud M Khair, Christen R Mellano, Elizabeth F Shewman, Gregory P Nicholson, Anthony A Romeo, Brian J Cole, Nikhil N Verma
PURPOSE: To compare the initial fixation stability, failure strength, and mode of failure of 5 different screw types and fixation methods commonly used for the classic Latarjet procedure. METHODS: Thirty-five fresh-frozen cadaveric shoulder specimens were allocated into 5 groups. A 25% anteroinferior glenoid defect was created, and a classic Latarjet coracoid transfer procedure was performed. All grafts were fixed with 2 screws, differing by screw type and/or fixation method...
September 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28682860/a-biomechanical-analysis-of-plate-fixation-using-unicortical-and-bicortical-screws-in-transverse-metacarpal-fracture-models-subjected-to-4-point-bending-and-dynamical-bending-test
#12
Eirini Liodaki, Robert Wendlandt, Klaus Waizner, Brigitte E Schopp, Peter Mailänder, Felix Stang
In the published literature there are controversial data to the biomechanical stability of monocortical comparing to the bicortical fixation of metacarpal fractures. The aim of this study was to compare the biomechanical stability of monocortical and bicortical locking osteosynthesis in quasi-static and dynamic 4-point bending tests of composite third metacarpal bone (4th Gen third metacarpal, Sawbones, Malmö, Sweden) fixed with 7-hole locking plate (XXS System, Biotech-Ortho, Wright, Memphis, TN). The tests to determine quasi-static yield and bending strength as well as fatigue strength were conducted in 4 groups of 10 samples after creating standardized mid-shaft transverse osteotomies using a diamont belt grinder (0...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28650881/intraoperative-radiographic-technique-for-visualization-of-bicortical-or-tricortical-anteromedial-sacral-screw-placement
#13
Nikhil Jain, Elizabeth Yu
The bicortical anteromedial sacral screw trajectory is the most widely used for S1 screw fixation. The assessment of anterior cortex purchase is difficult on a lateral view due to the overlapping bony anatomy of the sacrum and pelvis. We describe the intraoperative radiographic technique for a personalized pelvic inlet view that is perpendicular to the superior sacral surface to visualize sacral screw placement. This technique allows for assessment of anterior cortex purchase with anteromedial angulation in the same view...
June 23, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28640396/an-anatomical-study-of-plate-rod-fixation-in-feline-tibiae
#14
Andreas Gutbrod, Simona Vincenti, Karolin Kühn, Sebastian Christoph Knell, Philipp Alexander Schmierer, Antonio Pozzi
OBJECTIVE: To investigate the feasibility of placing bi-cortical cortex (B-cort) or mono-cortical locking screws (M-lock) in a plate-rod construct applied to the feline tibia in combination with different intramedullary (IM) pins. METHODS: Twenty-four feline tibiae of cats were divided into 4 groups, corresponding to IM pin sizes filling approximately 30% (1.0 mm), 40% (1.4 mm), 45% (1.6 mm), and 50% (1.8 mm) of the medullary canal. Computed tomography (CT) was performed to trace potential screw trajectories in each group...
June 22, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28623079/restoration-of-articular-geometry-using-current-graft-options-for-large-glenoid-bone-defects-in-anterior-shoulder-instability
#15
Laurent B Willemot, Mohsen Akbari-Shandiz, Joaquin Sanchez-Sotelo, Kristin Zhao, Olivier Verborgt
PURPOSE: The purpose of this cadaveric study was to compare standard and modified coracoid transfer procedures, bicortical and tricortical iliac crest autografts, and tibial plafond and glenoid allografts with respect to glenoid surface curvature restoration. METHODS: Computed tomography scans of 8 cadaveric shoulders were acquired in 9 conditions: (1) intact, (2) 25% width defect, (3) classic Latarjet, (4) modified congruent-arc Latarjet, (5) tricortical iliac crest inner table, (6) outer table, (7) bicortical iliac crest, (8) distal tibia, and (9) glenoid allograft...
September 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28551828/rate-and-mode-of-screw-misplacements-after-3d-fluoroscopy-navigation-assisted-insertion-and-3d-imaging-control-of-1547-pedicle-screws-in-spinal-levels-t10-s1-related-to-vertebrae-and-spinal-sections
#16
Horst Balling, Thomas R Blattert
PURPOSE: In the field of spinal surgery, 3D-fluoroscopy navigation-assisted pedicle screw (PS) insertion with intra-operative 3D-image control represents a modern application of contemporary navigation technology. In literature, sectional or vertebral accuracy limitations of this image-guidance approach are not profoundly specified. This observational study explicitly differentiates accuracy rates and misplacement mode between spinal sections and single vertebrae from T10 to S1 using a navigation-assisted approach...
May 27, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28538286/any-cortical-bridging-predicts-healing-of-supracondylar-femur-fractures-after-treatment-with-locked-plating
#17
Patrick K Strotman, Madhav A Karunakar, Rachel Seymour, William D Lack
OBJECTIVES: To determine the accuracy and reliability of radiographic cortical bridging criteria in predicting the final healing of supracondylar femur fractures after treatment with locked plating. DESIGN: Retrospective review. SETTING: Two Level 1 trauma centers. PATIENTS/PARTICIPANTS: Patients who presented with supracondylar femur fractures (OTA/AO 33A, C) and were treated with locking plate fixation between January 1, 2004, and January 1, 2011...
October 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28507978/modified-tension-slide-technique-for-anatomical-distal-biceps-tenodesis-using-a-bicortical-endobutton-and-a-tenodesis-screw
#18
Jagadish Prabhu, Mohammed Khalid Faqi, Fahad Al-Khalifa, Rashad Khamis Awad
INTRODUCTION: Many surgical techniques have been described in the literature. In this article, we describe surgical technical details along with tips and tricks of distal biceps tendon tenodesis using the EndoButton and tension - slide technique, a modification of the suspensory cortical button technique, which allows the surgeon to tension and repairs the biceps tendon through the single longitudinal anterior incision. This modification in surgical technique of using dual implants, i...
November 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28462190/mechanical-evaluation-of-the-use-of-conventional-and-locking-miniplate-screw-systems-used-in-sagittal-split-ramus-osteotomy
#19
Zarina Tatia Barbosa Vieira Santos, Douglas Rangel Goulart, Eder Alberto Sigua-Rodriguez, Leandro Pozzer, Sergio Olate, José Ricardo Albergaria-Barbosa
OBJECTIVES: The aim of this study was to compare the mechanical resistance of four different osteosyntheses modeled in two different sagittal split ramus osteotomy (SSRO) designs and to determine the linear loading in a universal testing machine. MATERIALS AND METHODS: An in vitro experiment was conducted with 40 polyurethane hemimandibles. The samples were divided into two groups based on osteotomy design; Group I, right angles between osteotomies and Group II, no right angles between osteotomies...
April 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/28457266/effects-of-monocortical-and-bicortical-mini-implant-anchorage-on-bone-borne-palatal-expansion-using-finite-element-analysis
#20
Robert J Lee, Won Moon, Christine Hong
INTRODUCTION: Bone-borne palatal expansion relies on mini-implant stability for successful orthopedic expansion. The large magnitude of applied force experienced by mini-implants during bone-borne expansion may lead to high failure rates. Use of bicortical mini-implant anchorage rather than monocortical anchorage may improve mini-implant stability. The aims of this study were to analyze and compare the effects of bicortical and monocortical anchorages on stress distribution and displacement during bone-borne palatal expansion using finite element analysis...
May 2017: American Journal of Orthodontics and Dentofacial Orthopedics
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