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https://www.readbyqxmd.com/read/29332226/monocortical-fixation-of-the-coracoid-in-the-latarjet-procedure-is-significantly-weaker-than-bicortical-fixation
#1
Uli Schmiddem, Nael Hawi, Emmanouil Liodakis, Antonios Dratzidis, Manuel Kraemer, Christof Hurschler, Richard Page, Rupert Meller
PURPOSE: A crucial step of the Latarjet procedure is the fixation of the coracoid process onto the glenoid. Multiple problems associated with the fixation have been described, including lesions of the suprascapular nerve due to prominence of the screw or bicortical drilling. The purpose of the present study was to evaluate whether monocortical fixation, without perforating the posterior glenoid cortex, would provide sufficient graft stability. METHODS: Coracoid transfer was performed in 14 scapula models (Sawbones®, Composite Scapula, 4th generation)...
January 13, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29295797/comparative-study-of-biomechanical-stability-of-resorbable-and-titanium-fixation-systems-after-sagittal-split-ramus-osteotomy-with-a-novel-designed-in-vitro-testing-unit
#2
Murat Ulu, Emrah Soylu, Seyfi Kelebek, Serkan Dikici, Hakan Oflaz
INTRODUCTION: Sagittal split ramus osteotomy (SSRO) is one of the most popular surgical procedures for correction of mandibular deformities. Several clinical and biomechanical studies exist in the literature which, comparing the stability of different osteosynthesis materials and techniques, were performed using two or three-point biomechanical test models. The aim of this study was to compare the stability of biodegradable and titanium materials for SSRO on one-piece polyurethane mandible samples which were fixed in a novel designed 6-point testing unit...
December 13, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29283940/evaluation-of-intersegmental-displacement-after-mandibular-setback-split-ramus-osteotomy-using-modified-l-shaped-monocortical-plate-cone-beam-computed-tomography-superimposition
#3
Dae Seok Hwang, Hyeong Geun Lee, Sang Hun Shin, Uk Kyu Kim
PURPOSE: The purpose of the current study is to compare intersegmental displacements after mandibular setback sagittal split ramus osteotomy (SSRO) using 4 types of osteosynthesis methods. PATIENTS AND METHODS: This is a retrospective study of 53 subjects who presented underwent bilateral setback SSRO at Pusan National University Hospital from January 2009 to December 2013. The subjects were divided into 4 groups according to the osteosynthesis method applied: group A-modified L-type monocortical plate; B-conventional miniplate; group C-bicortical screws; group D-metal and absorbable screws...
December 27, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29282136/in-vitro-biomechanical-testing-of-the-3-5%C3%A2-mm-lcp-in-torsion-a-comparison-of-unicortical-locking-to-bicortical-nonlocking-screws-placed-nearest-the-fracture-gap
#4
Alex A Padron, John R Owen, Jennifer S Wayne, Sevima A Aktay, Roy F Barnes
OBJECTIVE: This biomechanical study compared the torsional strength and stiffness of a locking compression plate with all locking versus nonlocking screws and examined the effect of placing a locking unicortical or nonlocking bicortical screw nearest the fracture gap in a synthetic bone model. RESULTS: Synthetic bone models simulating a diaphyseal fracture without anatomic reduction were tested using four screw configurations: all bicortical locking (ABL), all bicortical nonlocking (ABN), a hybrid construct with a bicortical nonlocking screw nearest the fracture gap (BN), and a unicortical locking screw placed nearest the fracture gap (UL)...
December 27, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29276535/influence-of-screw-type-and-length-on-fixation-of-anterior-glenoid-bone-grafts
#5
Laurent B Willemot, Ross Wodicka, Adrian Bosworth, Alessandro Castagna, Joseph Burns, Olivier Verborgt
Background: Bone-grafting procedures for recurrent shoulder instability produce low recurrence rates, although they are associated with complications such as graft non-union. Inadequate screw purchase is considered to play a causative role. However, excessive screw length can endanger neurovascular structures. The present study aimed to investigate how type and length of screws influences construct rigidity in a simplified glenoid model. Methods: Testing was performed on composite polyurethane foam models with material properties and abstract dimensions of a deficient glenoid and an bone graft...
January 2018: Shoulder & Elbow
https://www.readbyqxmd.com/read/29242952/unicortical-self-drilling-external-fixator-pins-reduce-thermal-effects-during-pin-insertion
#6
Markus Greinwald, Patrick A Varady, Peter Augat
INTRODUCTION: External fixation is associated with the risk of pin loosening and pin infection potentially associated to thermal bone necrosis during pin insertion. OBJECTIVE: This study aims to investigate if the use of external fixator systems with unicortical pins reduces the heat production during pin insertion compared to fixators with bicortical pins. METHODS: Porcine bone specimens were employed to determine bone temperatures during insertion of fixator pins...
December 14, 2017: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/29216793/parametric-study-of-patient-specific-femoral-locking-plates-based-on-a-combined-musculoskeletal-multibody-dynamics-and-finite-element-modeling
#7
Xunjian Fan, Zhenxian Chen, Zhongmin Jin, Qida Zhang, Xuan Zhang, Yinghu Peng
A combined musculoskeletal multibody dynamics and finite element modeling was performed to investigate the effects of design parameters on the fracture-healing efficiency and the mechanical property of a patient-specific anatomically adjusted femoral locking plate. Specifically, the screw type, the thickness and material of the locking plate, the gap between two femoral fragments (fracture gap) and the distance between bone and plate (interface gap) were evaluated during a human walking. We found that the patient-specific locking plate possessed greater mechanical strength and more efficient fracture healing than the corresponding traditional plate...
December 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29165324/in-vivo-evaluation-of-modified-silk-fibroin-scaffolds-with-a-mimicked-microenvironment-of-fibronectin-decellularized-pulp-tissue-for-maxillofacial-surgery
#8
Thanh H Thai, Thongchai Nuntanaranont, Suttatip Kamolmatyakul, Jirut Meesane
This study aimed to carry out in vivo testing of the formation of new bone by modified silk fibroin scaffolds with a mimicked microenvironment of fibronectin/decellularized pulp in bone defects. Silk fibroin scaffolds were fabricated into three-dimensional scaffolds before being coated with fibronectin/decellularized pulp. The coated scaffolds were implanted into rabbits. Twenty-four bicortical calvarial defects in 12 rabbits were divided randomly into two groups: non-coated and coated silk fibroin scaffolds...
November 22, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/29064584/accuracy-of-a-patient-specific-3d-printed-drill-guide-for-placement-of-cervical-transpedicular-screws
#9
Sinead E Hamilton-Bennett, Bill Oxley, Sebastien Behr
OBJECTIVE: To develop a patient-specific 3-dimensional (3D) printed drill guide for placement of cervical transpedicular screws and to assess its accuracy. STUDY DESIGN: Prospective case-series. SAMPLE POPULATION: Thirty-two cervical pedicle screws (CPS) placed in 3 large breed dogs. METHODS: Computed tomographic (CT) data of the cervical vertebrae were exported to a medical image processing software and 3D virtual vertebral models were created for each vertebra...
October 24, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/29056288/evaluation-of-an-experimental-oblique-plate-for-osteosynthesis-of-mandibular-condyle-fractures
#10
Florian Wagner, Martin Strasz, Hannes Traxler, Kurt Schicho, Rudolf Seemann
OBJECTIVE: The aim of this study was to test the bone thickness and potential screw length for osteosynthesis of condylar base fractures (according to the Loukota classification) with an experimental titanium plate, placed in an ideal position against 2 types of conventional plates. STUDY DESIGN: After exclusion of completely edentulous mandibles, 28 dentate macerated mandibles available at the time of the study were included. Linear regression models 1 and 2 compared the sums of the 2 cranial bone thicknesses and the 3 caudal thicknesses among the 3 different plate designs, and linear models 3 and 4 tested the bone thickness in the 2 most cranial screw axes...
September 21, 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/29033148/medial-approach-for-minimally-invasive-harvesting-of-a-deep-circumflex-iliac-artery-flap-for-reconstruction-of-the-jaw-using-virtual-surgical-planning-and-cad-cam-technology
#11
A Modabber, N Ayoub, A Bock, S C Möhlhenrich, B Lethaus, A Ghassemi, D A Mitchell, F Hölzle
Donor site morbidity is the most common limitation of the deep circumflex iliac artery (DCIA) flap, so the purpose of this paper is to describe a new, minimally-invasive, approach to its harvest using virtual surgical planning and CAD/CAM technology to reduce functional and aesthetic morbidity at the donor site. Virtual surgical planning was based on preoperative computed tomographic data. A newly-designed surgical guide made using CAD/CAM technology was used to transfer the virtual surgical plan to the site of operation...
October 12, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28970991/long-biceps-subpectoral-tenodesis-with-suspensory-button-and-bicortical-fixation
#12
Nuno Gomes, Manuel Ribeiro da Silva, Helder Pereira, Ricardo Aido, Ricardo Sampaio
Tenodesis of the long head of the biceps (LHB) tendon has long been recognized as a valid alternative to address pathologic conditions of this tendon. However, the location and type of fixation is still a matter of discussion, because common complications associated with this procedure include failure of the repair, persistent pain, reaction to the fixation device, cosmetic deformity, and fracture. The authors describe a method of subpectoral LHB tenodesis that aims to preserve bone stock and allows a strong, easy, and reproducible type of fixation with a minimal approach...
August 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28968327/posterior-iliac-crest-bone-graft-how-much-is-enough
#13
Thaddeus Boucree, Dylan McLaughlin, Silvy Akrawe, Vigen Darian, Aamir Siddiqui
Autogenous bone grafting is the gold standard for reconstructing craniofacial defects. Mandibular defects are reliably reconstructed with free nonvascularized bone, such as from the posterior iliac crest (PIC). In light of improved imaging, including 3-dimensional computed tomography scanning, a more accurate defect estimation is possible. A strong understanding of bone graft available is necessary. The purpose of this study was an updated review of the dissection and quantification of the amount of bone that can be safely harvested...
November 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28939191/does-fixation-method-affect-stability-of-sagittal-split-osteotomy-and-condylar-position
#14
Reza Tabrizi, Fereydoun Pourdanesh, Hassan Mirmohammad Sadeghi, Sholeh Shahidi, Behnaz Poorian
PURPOSE: Fixation methods are important for condylar position and stability in sagittal split osteotomy (SSO) procedures. The aim of the present study was to compare the changes in the condylar position and stability after SSO for mandibular setback in plate fixation with monocortical screws and bicortical screws. PATIENTS AND METHODS: In the present retrospective cohort study, patients who had undergone mandibular setback were studied in 2 groups. In group 1, fixation was performed using a miniplate with 4 monocortical screws...
August 31, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28922701/unicortical-and-bicortical-plating-in-the-fixation-of-comminuted-fractures-of-the-clavicle-a-biomechanical-study
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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...
October 2017: Journal of Cranio-maxillo-facial Surgery
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