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https://www.readbyqxmd.com/read/29738859/analysis-of-a-unilateral-bridging-cage-for-lumbar-interbody-fusion-2-year-clinical-results-and-fusion-rate-with-a-focus-on-subsidence
#1
Nicolas Heinz von der Hoeh, Tomaso Villa, Fabio Galbusera Galbusera, Anna Voelker, Ulrich A Spiegl, Jan-Sven Jarvers, Christoph-Eckhard Heyde
PURPOSE: The aim of this study was to evaluate the biomechanical stability and the clinical and radiographic outcomes of patients undergoing transforaminal lumbar interbody fusion (TLIF) using an oblique bridging cage with a particular focus on subsidence. METHODS: Finite element models (FEMs) were developed to compare the biomechanics of the oblique cage with conventional PLIF and banana-shaped cages with TLIF. Additionally, a retrospective review of a prospective collected database was performed to investigate the clinical and radiological results with a focus on the subsidence rate using an oblique polyetheretherketone (PEEK) cage with a bicortical load-bearing design...
May 5, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29724535/does-fixation-method-affects-temporomandibular-joints-after-mandibular-advancement
#2
Erdogan Utku Ureturk, Aysegul Apaydin
PURPOSE: Sagittal split ramus osteotomy (SSRO) is a standard procedure in which miniplates and screws are used to achieve stabilization. Although the titanium plate and screw fixation system is stable, resorbable fixation systems are also used. There is currently no consensus on the ideal fixation technique for SSRO procedures and its effect on the condyle. We aimed to evaluate the stress distribution on temporomandibular joints (TMJ). METHODS: A 3D finite element model of a hemimandible was designed and 5 mm advancement was simulated on a computer model...
April 7, 2018: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29698075/repair-of-a-tibiotarsal-fracture-in-a-pomeranian-goose-anser-anser-with-a-locking-plate
#3
Pavel Slunsky, Janine Weiß, Alexander Haake, Muhammad Shahid, Leo Brunnberg, Kerstin Müller
A 2-year-old Pomeranian goose ( Anser anser) weighing 8.1 kg was examined because of non-weight-bearing lameness of the right limb. A closed, transverse, diaphyseal fracture of the distal third of the right tibiotarsus with a craniolateral displacement of the distal fragment was diagnosed radiographically. Surgery under general anesthesia was performed to repair the fracture with a 14-hole, 2.7-mm locking plate fixed with 6 screws in a bicortical manner. Two days later, the bird was fully weight-bearing on the leg...
March 2018: Journal of Avian Medicine and Surgery
https://www.readbyqxmd.com/read/29677226/clinical-outcomes-of-bicortical-engagement-implants-in-atrophic-posterior-maxillae-a-retrospective-study-with-1-to-5-years-follow-up
#4
Piklam Ng, Xiucheng Hu, Shuangquan Wan, Hui Mo, Feilong Deng
Bicortical dental implantation technique was regarded as an alternative to internal sinus lift technique with bone grafting in dental implantation in atrophic maxillae. The purpose of this retrospective study was to evaluate the survival rates and bone stability of 6- and 10-mm implants in the posterior maxilla using bicortical dental implantation techniques after 1 to 5 years of prosthetic loading. A total of 53 patients received posterior maxillary implant treatments. Of these, 31 patients received bicortical dental implantation (group A), and 25 patients received traditional implantation (group B)...
April 20, 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29659379/bony-reconstruction-of-the-anterior-glenoid-rim
#5
Laurent B Willemot, Bassem T Elhassan, Olivier Verborgt
Recurrent anterior shoulder instability is associated with glenohumeral bone loss. Glenoid deficiency compromises the concavity-compression mechanism. Medial Hill-Sachs lesions can result in an off-track humeral position. Anterior glenoid reconstruction or augmentation prevents recurrence by addressing the pathomechanics. In Bristow and Latarjet procedures, the coracoid process is harvested for conjoint tendon transfer, capsular reinforcement, and glenoid rim restoration. Complications and the nonanatomic nature of the procedure have spurred research on graft sources...
May 15, 2018: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/29658979/mini-fragment-fixation-is-equivalent-to-bicortical-screw-fixation-for-horizontal-medial-malleolus-fractures
#6
Adam M Wegner, Philip R Wolinsky, Michael A Robbins, Tanya C Garcia, Derek F Amanatullah
Horizontal fractures of the medial malleolus occur through application of valgus or abduction force through the ankle that creates a tension failure of the medial malleolus. The authors hypothesize that mini-fragment T-plates may offer improved fixation, but the optimal fixation construct for these fractures remains unclear. Forty synthetic distal tibiae with identical osteotomies were randomized into 4 fixation constructs: (1) two parallel unicortical cancellous screws; (2) two parallel bicortical cortical screws; (3) a contoured mini-fragment T-plate with 2 unicortical screws in the fragment and 2 bicortical screws in the shaft; and (4) a contoured mini-fragment T-plate with 2 bicortical screws in the fragment and 2 unicortical screws in the shaft...
April 16, 2018: Orthopedics
https://www.readbyqxmd.com/read/29655819/in-vitro-study-of-a-modified-sagittal-split-osteotomy-fixation-technique-of-the-mandible-a-mechanical-test
#7
C L Sonego, M A R Scheffer, O L Chagas Júnior, B M Vetromilla, L P Fernandes, A Ozkomur, A N Silva Júnior, S A Q Miguens Júnior, P A G Hernandez
This study was performed to evaluate the compressive mechanical strength of rigid internal fixation (RIF) using 1.5-mm L-shaped plates fixed with monocortical screws in sagittal split osteotomy (SSO). Thirty synthetic hemimandibles, which had all undergone a 5-mm advancement, were divided into three groups: three 12-mm bicortical titanium screws were placed in an inverted L pattern in group A; one straight 2.0-mm system spaced titanium plate fixed with four 5-mm monocortical screws was used in group B; two 1...
April 11, 2018: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29571350/elastic-stable-chest-repair-costal-plate-fixation-for-sternotomy-nonunion
#8
Michael R Gooseman, Graham J Cooper, John G Edwards
Sterile sternotomy nonunion is a recognized complication after median sternotomy. It is defined as sternotomy that persists after 3 months without evidence of bony healing but with healing of the overlying soft tissues. It is a morbid condition associated with pain and sternal instability. We present two challenging cases of sterile sternotomy nonunion after cardiac operations that were treated successfully with novel methods adopted from the Elastic Stable Chest Repair for complex pectus deformity repair, using transverse costal to costal external cortical plates and bicortical screws, after debridement, autologous bone grafting and double loop wire sternal approximation...
April 2018: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29556114/the-effect-of-drill-hole-location-on-load-bearing-capacity-of-long-bones
#9
Christopher James Yiachos, Subrata Saha
We investigated how load bearing capacity (LBC) of long bone differs with a bicortical drill hole in a compressive/tensile location vs. a neutral location. Group I had a hole drilled through 0°/180° ([compressive at 0°/maximum tensile at 180°]), Group II at 90°/270° ([neutral]), and Group III at 135°/315° ([tensile at 135°/compressive at 315°]). Maximum load at failure and stiffness was measured. A significant ([ p  < 0.05]) decrease in LBC of all Group I and Group III bones was observed. Loss of strength for Group II was statistically insignificant ([ p  > 0...
June 2018: Journal of Orthopaedics
https://www.readbyqxmd.com/read/29550280/molecular-alterations-of-newly-formed-mandibular-bone-caused-by-zoledronate
#10
Y Yoshioka, E Yamachika, M Nakanishi, T Ninomiya, K Nakatsuji, M Matsubara, N Moritani, Y Kobayashi, T Fujii, S Iida
Bone quality is defined by structural and material characteristics. Most studies on the mandible have focused on the analysis of structural characteristics, with insufficient investigation of material characteristics. This study tested whether zoledronate affects the material characteristics of newly formed mandibular bone. Thirty-six female Wistar rats were assigned to three groups: sham-ovariectomized rats (SHAM, n=12), ovariectomized rats (OVX, n=12), and ovariectomized rats treated with zoledronate (ZOL, n=12)...
March 14, 2018: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29534912/evaluation-of-condylar-resorption-rates-after-orthognathic-surgery-in-class-ii-and-iii-dentofacial-deformities-a-systematic-review
#11
REVIEW
Valthierre Nunes de Lima, Leonardo Perez Faverani, Joel Ferreira Santiago, Celso Palmieri, Osvaldo Magro Filho, Eduardo Piza Pellizzer
The purpose of this study was to perform a systematic review of morphological alterations in the condyles after orthographic surgery involving a sagittal split ramus osteotomy (SSRO), with or without surgery on the maxilla. Searches were performed on three databases and registered in the PROSPERO. The selected studies fulfilled the criteria established by the following PICO model: (1) population: individuals with skeletal dentofacial deformities (class II or III facial patterns), without asymmetry; (2) intervention: orthognathic surgery for mandibular setback using an SSRO, with or without a Le Fort I osteotomy, and fixed with bicortical screws or plates and screws; (3) comparison: orthognathic surgery for mandibular advancement using an SSRO, with or without a Le Fort I osteotomy, and fixed with plates and screws or bicortical screws; and (4) outcome: condylar resorption rate and relapse...
April 2018: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29526060/straight-forward-versus-bicortical-fixation-penetrating-endplate-in-lumbosacral-fixation-a-biomechanical-study
#12
Ahmet Karakasli, Nihat Acar, Bora Uzun
OBJECTIVE: Many lumbosacral fixation techniques have been described to offer a more screw-bone purchase. The forward anatomical fixation parallel to the endplate is still the most preferred method. Literature revealed little knowledge regarding the mechanical stability of lumbosacral trans-endplate fixation compared to the traditional trans-pedicular screw fixation method. The aim of this study is to assess the pull-out strength of lumbosacral screws penetrating the end plate and comparing it to the conventional trans-pedicular screw insertion method...
March 2018: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/29481493/contour-restoration-of-over-resected-mandibular-angle-and-lower-border-by-reduction-mandibuloplasty-using-three-dimensional-planning-and-computer-aided-design-and-manufacturing-custom-made-titanium-implants
#13
Jae Man Woo, Seung-Hak Baek, Jong-Cheol Kim, Jin-Young Choi
OBJECTIVE: The purpose of this clinical report was to introduce a new methodology for contour restoration of the over-resected mandible by reduction mandibuloplasty using 3-dimensional (3D) planning and computer-assisted design and manufacturing (CAD-CAM) custom-made titanium implants. PATIENT AND METHOD: A 20-year-old male patient had undergone reduction of the zygoma and mandibular angle and lower border for esthetic reason 1 year ago at a private clinic. However, he was not satisfied with surgical outcome and wanted to restore his original facial volume and contour...
February 23, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29460514/rehabilitations-with-immediate-loading-of-one-piece-implants-stabilized-with-intraoral-welding
#14
M E Pasqualini, D Lauritano, F Rossi, L Dal Carlo, M Shulman, F Meynardi, D Colombo, P Manenti, G Comola, P Zampetti
The authors present an implant prosthesis procedure that uses screws on one-piece implants connected with a titanium pin at their abutment level and one supporter titanium bar in order to guarantee immediate stabilization. These can be implanted and fitted with customized temporary crowns in a single surgical procedure, restoring function and aesthetics and consenting recovery of the bone deficit with reduced healing times and limited patient discomfort. One-piece wide-diameter titanium screw implants with thread measurements of 2...
January 2018: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/29457744/optimal-safe-implantation-corridors-in-feline-cervical-vertebrae-c2-t1-ct-study-in-16-domestic-shorthair-cats
#15
Irene Espadas, Thomas W Maddox, Felipe de Vicente
Objectives The objective of this study was to define safe corridors for the optimal placement of bicortical implants in the feline cervical spine (C2-T1) using CT. Methods CT images of feline cervical spines (n = 16) were reviewed retrospectively. Multiplanar reconstructions were used to define the optimal safe corridors. Safe corridors were defined by their angle of insertion, width and length. The insertion point within the vertebral body was also described. Vertebral measurements were compared between vertebrae using multilevel linear regression, and left and right measurements within vertebrae were compared with the paired samples Wilcoxon signed-rank test...
February 1, 2018: Journal of Feline Medicine and Surgery
https://www.readbyqxmd.com/read/29395586/a-prospective-observational-assessment-of-unicortical-distal-screw-placement-during-volar-plate-fixation-of-distal-radius-fractures
#16
Agnes Z Dardas, Charles A Goldfarb, Martin I Boyer, Daniel A Osei, Christopher J Dy, Ryan P Calfee
PURPOSE: Although volar plating of the distal radius is performed frequently, the necessity of distal bicortical fixation in the metaphyseal and epiphyseal areas of the distal radius has not been proven. This study aimed primarily to quantify the ability of unicortical distal screws to maintain operative reduction of adult distal radius fractures and secondarily to determine if unicortical screw lengths could be predicted based on anatomical measurements. METHODS: This prospective trial enrolled 75 adult patients undergoing volar locking plate fixation of a unilateral distal radius fracture at a tertiary center...
January 25, 2018: Journal of Hand Surgery
https://www.readbyqxmd.com/read/29364337/to-what-extent-does-hyaluronic-acid-affect-healing-of-xenografts-a-histomorphometric-study-in-a-rabbit-model
#17
Osman Fatih Arpağ, Ibrahim Damlar, Ahmet Altan, Ufuk Tatli, Ahmet Günay
Among the many graft materials that have been used for the treatment of bone defects in oral and maxillofacial regions is xenograft. To improve osteoconductive effects of xenografts, they have been combined with various biocompatible materials, such as hyaluronic acid and bone morphogenetic protein. To determine bone-healing capacity of high molecular weight hyaluronic acid (HA) combined with xenograft in rabbit calvarial bone defects. Ten adult male New Zealand rabbits (mean weight 3 kg) were included in the study...
January 18, 2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29332226/monocortical-fixation-of-the-coracoid-in-the-latarjet-procedure-is-significantly-weaker-than-bicortical-fixation
#18
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
#19
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...
February 2018: 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
#20
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
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