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https://www.readbyqxmd.com/read/28399323/short-stem-reverse-total-shoulder-arthroplasty-periprosthetic-type-a-fracture
#1
Bryan M Saltzman, Timothy Leroux, Michael J Collins, Thomas A Arns, Brian Forsythe
Alterations have been made over the years to the standard reverse total shoulder arthroplasty (RTSA) prosthetic components in an effort to decrease adverse events; this has led to the advent of a short humeral stem prosthesis. To the authors' knowledge, there are no reports describing the complication of a traumatic periprosthetic Wright and Cofield classification type A fracture with use of a short metaphyseal humeral stem component for RTSA. The authors describe a 49-year-old woman with this pathology who was treated with open reduction and internal fixation using a proximal humerus locking plate, unicortical and bicortical screw fixation, and a cerclage wire construct without the need to violate the shoulder joint or revise components...
April 11, 2017: Orthopedics
https://www.readbyqxmd.com/read/28391395/biomechanical-analysis-of-anterior-ring-fixation-of-the-ramus-in-type-c-pelvis-fractures
#2
S McLachlin, M Lesieur, D Stephen, H Kreder, C Whyne
PURPOSE: This biomechanical study compared the stability of four different ramus fracture fixation methods for Type C pelvic ring injuries in the absence of posterior fixation. METHODS: A 5-mm vertical osteotomy of the mid-superior and inferior pubic ramus was created in 12 synthetic pelvic models. Four surgical constructs were compared: (1) two-pin AIIS external fixation, (2) 3.5-mm reconstruction plating, (3) bicortical, fully threaded 3.5-mm, and (4) 6.5-mm pubic ramus screws...
April 8, 2017: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/28391077/modified-technique-used-for-sagittal-splitting-of-the-mandible
#3
T Loncle, P Bontemps, M Bénaicha
Sagittal osteotomy of the mandible is the most common orthognathic surgery procedure. The drawbacks of this technique are: nerve disturbance, the common formations of a pre-angular notch after mandibular advancement, and the impossibility of lowering the mandibular angle bicortically. The goal of the described technique is to maintain the basal mandibular edge and the internal valve in one single piece. This split prevents unsightly notches appearing after mandibular advancement and it moves down the mandibular angle during counterclockwise rotation and does not increase the intergonial distance...
April 6, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28387633/smart-bioimpedance-controlled-craniotomy-concept-and-first-experiments
#4
Annegret Niesche, Meiko Müller, Fritz Ehreiser, Daniel Teichmann, Steffen Leonhardt, Klaus Radermacher
Craniotomy is part of many neurosurgical interventions to create surgical access to intracranial structures. The procedure conventionally bears a high risk of unintended dural tears or damage of the soft tissue underneath the bone. A new synergistically controlled instrument has recently been introduced to address this problem by combining a soft tissue preserving saw with an automatic cutting depth control. Many approaches are known to obtain the information required on the local bone thickness. However, they suffer from unsatisfactory robustness against disturbances occurring during surgery and many approaches require additional intra- or preoperative steps in the workflow...
March 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28377976/iliac-crest-histomorphometry-and-skeletal-heterogeneity-in-men
#5
Xiaoyu Tong, Inari S Burton, Jukka S Jurvelin, Hanna Isaksson, Heikki Kröger
PURPOSE: The cortical characteristics of the iliac crest in male have rarely been investigated with quantitative histomorphometry. Also it is still unknown how cortical microarchitecture may vary between the iliac crest and fractures related sites at the proximal femur. We studied the microarchitecture of both external and internal cortices within the iliac crest, and compared the results with femoral neck and subtrochanteric femoral shaft sites. METHODS: Undecalcified histological sections of the iliac crest were obtained bicortically from cadavers (n = 20, aged 18-82 years, males)...
June 2017: Bone Reports
https://www.readbyqxmd.com/read/28323708/fenestrated-screws-augmented-with-pmma-increase-the-pullout-strength-of-sacral-pedicle-screws
#6
Matthew Colman, Jonathan Pond, Kent Bachus, Brandon D Lawrence, William R Spiker, Darrel S Brodke
STUDY DESIGN: Biomechanics. OBJECTIVE: The objective of this study was to compare the fixation in osteoporotic specimens of a bicortical sacral pedicle screw to the following constructs: a unicortical solid screw augmented with polymethylmethacrylate (PMMA) (TRACT), a unicortical fenestrated screw augmented with PMMA (FEN), and a bicortical screw/sacral alar screw combination (PED/ALA). SUMMARY OF BACKGROUND DATA: Rigid posterior sacral fixation of osteoporotic spines is problematic due to poor bone quality...
April 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28291409/association-between-bicortical-screw-fixation-at-upper-instrumented-vertebra-and-risk-for-upper-instrumented-vertebra-fracture
#7
Young-Seop Park, Seung-Jae Hyun, Ho Yong Choi, Ki-Jeong Kim, Tae-Ahn Jahng
OBJECTIVE The aim of this study was to investigate the risk of upper instrumented vertebra (UIV) fractures associated with UIV screw fixation (unicortical vs bicortical) and polymethylmethacrylate (PMMA) augmentation after adult spinal deformity surgery. METHODS A single-center, single-surgeon consecutive series of adult patients who underwent lumbar fusion for ≥ 4 levels (that is, the lower instrumented vertebra at the sacrum or pelvis and the UIV of the thoracolumbar spine [T9-L2]) were retrospectively reviewed...
March 3, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28259279/volar-anatomy-of-the-proximal-phalanx-implications-for-screw-length-selection-for-fixation-of-shaft-fractures
#8
P Barrett Honeycutt, Edward W Jernigan, Wayne A Rummings, Peter J Stern, Reid W Draeger
PURPOSE: To investigate the anatomy of the volar surface of the proximal phalanx of the hand, specifically the longitudinal groove running along the volar phalangeal shaft. METHODS: We measured skeletonized proximal phalanges from 10 embalmed human cadaver hands at 5 equidistant points along the shaft. The difference between the maximum dorsal-palmar thickness of the shaft and thickness measured from the center of the volar groove to the most dorsal aspect of the phalanx indicated the depth of the groove at each point...
March 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28211302/is-c1-lateral-mass-screw-placement-safe-for-the-chinese-indians-and-malays-an-analysis-of-180-computed-tomography-scans
#9
C K Lee, T S Tan, Cyw Chan, M K Kwan
INTRODUCTION: C1 lateral mass (C1LM) screw is a common procedure in spine surgery. However, related studies are lacking in Asia. We aim to determine the safety of C1LM screw for the Chinese, Indians, and Malays. METHODS: Three-dimensional computed tomographies of 180 subjects (60 from each ethnic) were analyzed. The length and angulations of C1LM screw and the location of internal carotid artery (ICA) in relation to C1LM were assessed and classified according to the classification by Murakami et al...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28204927/bicortical-facet-screws-as-a-new-option-for-posterior-c2-fixation-anatomical-study-and-clinical-experience
#10
Angelo Rusconi, E Freitas-Olim, P Coloma, R Messerer, C Barrey
PURPOSE: C2 fixation is a demanding procedure, particularly in patients with variants of C1-C2 anatomy. The inferior articular process (IAP) of the axis can be an alternative for screw placement. We report the results of a CT study of C2 IAP anatomy and we present the clinical experience of 28 patients operated with this technique. METHODS: Anatomical study: 50 CT angiographies of the vertebral arteries (VA) were used for this study and, therefore, 100 IAPs were considered...
February 15, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28194343/the-effect-of-a-condylar-repositioning-plate-on-condylar-position-and-relapse-in-two-jaw-surgery
#11
Gyu Sik Jung, Taek Kyun Kim, Jeong Woo Lee, Jung Dug Yang, Ho Yun Chung, Byung Chae Cho, Kang Young Choi
BACKGROUND: Numerous condylar repositioning methods have been reported. However, most of them are 2-dimensional or are complex procedures that require a longer operation time and a highly trained surgeon. This study aims to introduce a new technique using a condylar repositioning plate and a centric relation splint to achieve a centric relationship. METHODS: We evaluated 387 patients who had undergone surgery for skeletal jaw deformities. During the operation, a centric relation splint, intermediate splint, final centric occlusion splint, and condylar repositioning plate along with an L-type mini-plate for LeFort I osteotomy or a bicortical screw for bilateral sagittal split ramus osteotomy were utilized for rigid fixation...
January 2017: Archives of Plastic Surgery
https://www.readbyqxmd.com/read/28142009/three-dimensional-analysis-of-long-term-stability-after-bilateral-sagittal-split-ramus-osteotomy-fixed-with-a-single-miniplate-with-4-monocortical-screws-and-1-bicortical-screw-a-retrospective-2-center-study
#12
Federico Hernández-Alfaro, Mirco Raffaini, Ariane Paredes-de-Sousa-Gil, Alice Sara Magri, Raquel Guijarro-Martínez, Adaia Valls-Ontañón
PURPOSE: This study evaluated the long-term stability of bilateral sagittal split ramus osteotomy fixed with a single miniplate with 4 monocortical screws and 1 bicortical screw (hybrid technique [HT]) using 3-dimensional (3D) analysis and an objective measuring tool, cone-beam computed tomography (CBCT). MATERIALS AND METHODS: Sixty-four patients who underwent bimaxillary surgery with mandibular advancement fixed with the HT were selected from 2 different institutions and enrolled in this retrospective study...
January 4, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28129880/construct-failure-after-open-reduction-and-plate-fixation-of-displaced-midshaft-clavicular-fractures
#13
M A Meeuwis, A F Pull Ter Gunne, M H J Verhofstad, F H W M van der Heijden
INTRODUCTION: Worldwide, implants mostly used for fixation of displaced midshaft clavicular fractures (DMCF) are the easily to bend reconstruction plate and the stiffer small fragment locking compression plate. Construct failure rates after plate fixation of DMCF are reported around 5 percent. Possible risk factors for construct failure are implant type and fracture type. However, little is known about the influence of fracture fixation method on construct failure. The aim of this study was to assess construct failure in plate fixation of DMCF and to identify possible risk factors...
January 23, 2017: Injury
https://www.readbyqxmd.com/read/28013577/plate-fixation-of-periprosthetic-femur-fractures-what-happens-to-the-cement-mantle
#14
Lukas Konstantinidis, Benjamin Schmidt, Anke Bernstein, Anja Hirschmüller, Steffen Schröter, Norbert Paul Südkamp, Peter Helwig
Osteosynthesis of periprosthetic femur fractures by screw fixation around the implanted prosthetic stem is currently regarded as the biomechanically superior option compared with cerclage. The aim of this biomechanical study was damage analysis of the cement mantle after revision screw insertion. A prosthetic stem (Bicontact) was implanted in 20 cadaveric femora in cemented technique. A locking compression plate (Synthes) was then applied to the lateral femur at the level of the prosthetic stem. The method of plate fixation to the femur was assigned randomly to three groups: bicortical non-locking screws, monocortical locking screws, and bicortical locking screws...
February 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28007487/effects-of-hypericum-perforatum-on-the-healing-of-xenografts-a-histomorphometric-study-in-rabbits
#15
I Damlar, O F Arpağ, U Tatli, A Altan
The aim of this study was to investigate effects of the Hypericum perforatum (St John's Wort) on bone healing in rabbit calvarium. Ten male New Zealand rabbits each had three bicortical defects made in the calvarial bones, which were filled with xenograft, xenograft+H perforatum oil extract, and autogenous graft. Four weeks postoperatively all rabbits were killed and the bony defects examined histomorphometrically. Tissue compartments including new bone (p<0.001), marrow space (p<0.001), and residual bone grafts (p=0...
December 19, 2016: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/27977441/fluoroscopic-confirmation-of-sacral-pedicle-screw-placement-utilizing-pelvic-inlet-and-outlet-technique-technical-note
#16
George M Ghobrial, Fadi Al-Saiegh, Daniel Franco, Joshua Heller
Minimally invasive surgical techniques may decrease length of stay, operative duration and blood loss, and postoperative pain. Numerous technical challenges and concerns surround the placement of percutaneous pedicle screws at the lumbosacral level. Maximization of screw triangulation, bicortical purchase, and rostral bias toward the sacral promontory has been shown repeatedly to stabilize lumbosacral segment instrumentation and maximize pullout strength. Because of the unique anatomy, conventional anteroposterior (AP) and lateral radiographic views are relatively less reliable at determining screw depth and penetration of the sacral cortex...
December 13, 2016: Clinical Spine Surgery
https://www.readbyqxmd.com/read/27902168/biomechanical-comparison-of-pullout-strengths-of-five-cortical-screw-types-an-innovative-measurement-method
#17
COMPARATIVE STUDY
Ahmet Karakaşlı, Nihat Acar, Mehmet Hilal Özcanhan, Fatih Ertem
OBJECTIVES: This study aims to assess five different cortical screw types using artificial femurs, under equated testing conditions. MATERIALS AND METHODS: We investigated the maximum force needed to cause deformation at screw-bone interface using fourth generation composite femurs by conducting separate pullout tests for each screw type. We normalized obtained results with traditional methods and cross-comparison. To conduct pullout tests dependent on screw dimensions, we eliminated the effect of bicortical bone thickness by equalizing the conditions of screw insertion...
December 2016: Eklem Hastalıkları Ve Cerrahisi, Joint Diseases & related Surgery
https://www.readbyqxmd.com/read/27779272/effect-of-monocortical-and-bicortical-screw-numbers-on-the-properties-of-a-locking-plate-intramedullary-rod-configuration-an-in-vitro-study-on-a-canine-femoral-fracture-gap-model
#18
Elinor J Field, Kevin Parsons, Julie A Etches, Katie Hamilton, Neil J Burton
OBJECTIVES: To evaluate the effect of varying the number and configuration of locking bicortical and monocortical screws on a plate-rod construct using a mid-diaphyseal femoral ostectomy model. METHODS: Thirty Greyhound femurs were assigned to six groups (A-F). An intramedullary pin was placed in each bone following which a 3.5 mm locking plate was applied with six differing locking screw configurations. Groups A to C had one bicortical screw in the most proximal and distal plate holes and one to three monocortical locking screws in the proximal and distal fragments...
November 23, 2016: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/27769074/the-detection-of-prominent-hardware-in-volar-locked-plating-of-distal-radius-fractures-intraoperative-fluoroscopy-versus-computed-tomography
#19
Devin Ganesh, Ben Service, Brian Zirgibel, Kenneth Koval
OBJECTIVES: To assess the utility of the dorsal tangential view (DTV) in detecting intraoperative dorsal screw penetration in distal radius fractures treated with volar locked plating. DESIGN: Retrospective cohort study. SETTING: Academic level 1 trauma center. PATIENTS/PARTICIPANTS: Skeletally mature patients where open reduction internal fixation with volar locked plating was the definitive treatment. A total of twenty-six patients were evaluated...
November 2016: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/27720182/plate-fixation-in-periprosthetic-femur-fractures-vancouver-type-b1-trochanteric-hook-plate-or-subtrochanterical-bicortical-locking
#20
Mark Lenz, Karl Stoffel, Heike Kielstein, Keith Mayo, Gunther O Hofmann, Boyko Gueorguiev
INTRODUCTION: Proximal plate fixation in periprosthetic femur fractures can be improved by plate anchorage in the greater trochanter (lateral tension band principle) or bicortical locking screw placement beside the prosthesis stem in an embracement configuration. Both concepts were compared in a biomechanical test using a femoral hook plate (hook) or a locking attachment plate (LAP). METHODS: After bone mineral density (BMD) measurement in the greater trochanter, six pairs of fresh frozen human femora were assigned to two groups and instrumented with cemented hip endoprostheses...
December 2016: Injury
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