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https://www.readbyqxmd.com/read/28231345/in-vitro-evaluation-of-three-methods-for-the-retrieval-of-fractured-screw-fragments-from-dental-implants
#1
Rubén Agustín-Panadero, Carlos Labaig-Rueda, Beatriz Castillo-Rodriguez, Alberto Ferreiroa, María Fernanda Solá-Ruíz
PURPOSE: To compare the effectiveness of different methods of fractured screw fragment retrieval from dental implants, comparing a conventional method (use of an exploration probe and ultrasonic tips) with two mechanical retrieval kits. MATERIALS AND METHODS: One hundred thirty-five screws in implant internal connections were fractured to test fragment retrieval comparing three methods: conventional method with the use of an explorer probe and ultrasonic tips (group CE), extraction with a mechanical kit with a guide cylinder (group MK1), and extraction with a mechanical kit without a guide cylinder (group MK2)...
February 23, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28230624/response-letter-to-minimally-invasive-posterior-decompression-combined-with-percutaneous-pedicle-screw-fixation-for-the-treatment-of-thoracolumbar-fractures-with-neurological-deficits
#2
https://www.readbyqxmd.com/read/28230623/safety-and-accuracy-of-freehand-versus-navigated-iliac-screws-results-from-222-screw-placements
#3
Randall J Hlubek, Kaith K Almefty, David S Xu, Jay D Turner, U Kumar Kakarla
STUDY DESIGN: Retrospective review. OBJECTIVE: To compare the safety and accuracy of the freehand technique versus stereotactic navigation for placement of iliac screws. SUMMARY OF BACKGROUND DATA: Iliac screw fixation is often used to augment lumbosacral reconstruction in advanced spine disease to increase the likelihood of successful arthrodesis. Iliac screws can be placed with image guidance, using either intraoperative fluoroscopy or computed tomography (CT) to guide navigation...
February 22, 2017: Spine
https://www.readbyqxmd.com/read/28230573/global-sagittal-imbalance-due-to-change-in-pelvic-incidence-after-traumatic-spinopelvic-dissociation
#4
Han-Dong Lee, Chang-Hoon Jeon, Nam-Su Chung, Suk-Hyeong Won
OBJECTIVES: Traumatic spinopelvic dissociation separates the spinal column from the pelvis, which usually creates lumbosacral kyphosis. We aimed to examine how the spinopelvic profiles changes after traumatic spinopelvic dissociation, and which are the relevant factors for the sagittal imbalance of the spine. DESIGN: Retrospective analysis. SETTING: Level I trauma center PATIENTS:: Thirty-nine consecutive patients who were diagnosed with traumatic spinopelvic dissociation and had a minimum 2-year radiological follow-up were included...
February 20, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28230572/automated-bone-screw-tightening-to-adaptive-levels-of-stripping-torque
#5
Karen J Reynolds, Aaron A Mohtar, Tammy M Cleek, Melissa K Ryan, Trevor C Hearn
OBJECTIVE: To use relationships between tightening parameters, related to bone quality, to develop an automated system that determines and controls the level of screw tightening. METHODS: An algorithm relating current at head contact (IHC) to current at construct failure (Imax) was developed. The algorithm was used to trigger cessation of screw insertion at a pre-defined tightening level, in real time, between head contact and maximum current. The ability of the device to stop at the pre-defined level was assessed...
February 20, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28229945/patients-appropriateness-acceptability-usability-and-preferences-for-pharmaceutical-preparations-results-from-a-literature-review-on-clinical-evidence
#6
REVIEW
Nélio Drumond, Diana A van Riet-Nales, Fatma Karapinar-Çarkit, Sven Stegemann
Patients play an important role in achieving the desired therapeutic outcomes, as they are frequently responsible for their own medication management. To facilitate drug administration and overcome medication issues, the patients' needs and preferences should be considered in the pharmaceutical drug product design. With the aim to evaluate the current state of evidence for patient appropriateness, acceptability, usability and preference for aspects of this design, a literature search was performed. Comparative clinical studies that assessed such endpoints for different patient populations were included and summarized descriptively...
February 13, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28229851/-skeletal-anchorage-in-the-past-today-and-tomorrow
#7
Birte Melsen, Michel Dalstra
INTRODUCTION: Skeletal anchorage was not introduced as an alternative to conventional anchorage modalities. The first skeletal anchorage was a ligature through a hole in the infrazygomatic crest. This was replaced by surgical screws and finally the TADs, which were optimized with respect to the material and morphology, were developed. A bracket-like head allows for the use of the mini-implant as indirect anchorage, but should not be a tool for lost control resulting from badly planned biomechanics or failing compliance...
March 2017: L' Orthodontie Française
https://www.readbyqxmd.com/read/28229355/femoral-shaft-osteotomy-for-obligate-outward-rotation-due-to-scfe
#8
Peter M Stevens, Lucas Anderson, Bruce A MacWilliams
Slipped capital femoral epiphysis (SCFE) is an adolescent disease that leads to retroversion of the femoral neck and shaft, relative to the head. Observing that patients with SCFE must walk with an outward foot progression angle and externally rotate the leg in order to flex the hip, we have been performing a femoral shaft rotational osteotomy wherein we rotate the lower femur 45° inward, relative to the upper femur. By correcting retroversion, our goal is to improve functional hip and knee motion, thereby mitigating the effects of SCFE impingement...
February 22, 2017: Strategies in Trauma and Limb Reconstruction
https://www.readbyqxmd.com/read/28229033/an-innovative-use-of-cortoss-bone-cement-to-stabilize-a-nonunion-after-interbody-fusion
#9
Michelle Granville, Robert E Jacobson
A 65-year-old male originally had surgery for spondylolisthesis at L5-S1 in 2008 and then went on to have an L4-5 transforaminal lumbar interbody fusion (TLIF) with pedicle screw fixation from L4 to S1 and interbody graft in 2010. Despite having two surgical procedures, he continued with intractable back pain and was told he had a failed lumbar fusion. When he was evaluated with a computerized tomography (CT) scan from April 2015, it demonstrated an erosive nonunion of the L4-5 interbody fusion without incorporation of the polyetheretherketone (PEEK) cage...
January 20, 2017: Curēus
https://www.readbyqxmd.com/read/28228129/prognostic-value-of-the-sliding-length-of-cephalocervical-screws-to-predict-the-risk-of-non-union-after-osteosynthesis-a-retrospective-analysis-of-86-patients-with-intracapsular-femoral-neck-fractures
#10
Yohei Hirakawa, Hidehiro Nakamura, Kazuhito Minamitani, Ryuki Hashida, Masafumi Gotoh, Naoto Shiba
BACKGROUND: Here, we assessed the prognostic value of the early sliding length (ESL) for predicting the risk of non-union after internal fixation of femoral neck fractures (FNFs) by Dual SC Screws (DSCS). METHODS: A retrospective analysis of 86 patients with intra-capsular FNFs was performed. They underwent osteosynthesis by DSCS at our institution between 2008 and 2013 with a minimum follow-up duration of 6 months. Preoperative displacement, fracture reduction quality, ESL of screws at 2 weeks postoperatively, and correlation of non-union with the ESL of screws were evaluated...
February 22, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28228100/influence-of-hooks-and-a-lag-screw-on-internal-fixation-plates-for-lateral-malleolar-fracture-a-biomechanical-and-ergonomic-study
#11
Rina Sakai, Masataka Uchino, Terumasa Yoneo, Yasuaki Ohtaki, Hiroaki Minehara, Terumasa Matsuura, Tsutomu Gomi, Masanobu Ujihira
BACKGROUND: For internal fixation of AO classification Type B lateral malleolar fracture, insertion of lag screws into the fracture plane and fixation with a one-third tubular plate as a neutralization plate are the standard treatment procedures. The one-third tubular plate is processed to a hook shape and hung on the distal end of the fibula. In this study, to compare the function of the hook and lag screws of a one-third tubular plate and LCP for osteosynthesis of lateral malleolar fracture, mechanical indices of internal fixation were compared among the one-third tubular plates with lag screws with and without the hook and a locking compression plate...
February 23, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28227792/an-innovative-therapy-for-peri-implantitis-based-on-radio-frequency-electric-current-numerical-simulation-results-and-clinical-evidence
#12
G Cosoli, L Scalise, G Tricarico, E P Tomasini, G Cerri, G Cosoli, L Scalise, G Tricarico, E P Tomasini, G Cerri, G Cosoli, E P Tomasini, G Cerri, G Tricarico, L Scalise
Peri-implantitis is a severe inflammatory pathology that affects soit and hard tissues surrounding dental implants. Nowadays, only prevention is effective to contrast peri-implantitis, but, in recent years, there is the clinical evidence of the efficiency of a therapy based on the application of radio frequency electric current, reporting that 81% of the cases (66 implants, 46 patients) were successfully treated. The aim of this paper is to present the therapy mechanism, exploring the distribution of the electric currents in normal and pathologic tissues...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28224272/biomechanical-evaluation-of-reconstruction-plates-with-locking-nonlocking-and-hybrid-screws-configurations-in-calcaneal-fracture-a-finite-element-model-study
#13
Ching-Hsuan Chen, Chinghua Hung, Yu-Chun Hsu, Chen-Sheng Chen, Chao-Ching Chiang
Calcaneal fractures are the most common fractures of the tarsal bones. The stability of fixation is an important factor for successful reconstruction of calcaneal fractures. The purpose of this study was to analyze the biomechanical influence of plate fixation with different combinations of locking and nonlocking screws during early weight-bearing phase. A three-dimensional FE foot model was established using ANSYS software, which comprised bones, cartilages, plantar fascia, and soft tissue. Calcaneal plate was fixed with whole locking (WLS), whole nonlocking (WNS), and hybrid screw configurations for FE analysis...
February 21, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28222876/evaluation-of-the-effect-of-an-offset-implant-configuration-in-the-posterior-maxilla-with-external-hexagon-implant-platform-a-3-dimensional-finite-element-analysis
#14
Victor Eduardo de Souza Batista, Fellippo Ramos Verri, Daniel Augusto de Faria Almeida, Joel Ferreira Santiago Junior, Cleidiel Aparecido Araújo Lemos, Eduardo Piza Pellizzer
STATEMENT OF PROBLEM: Slight displacement of the central implant in 3-unit implant-supported prostheses has been reported to improve biomechanical behavior. However, studies that assessed the effects of an offset implant configuration in the posterior maxilla are scarce. PURPOSE: The purpose of this 3-dimensional (3D) finite element analysis was to assess the effects of splinting in 3-unit implant-supported prostheses with varying implant positions (straight-line or offset configuration) in terms of the stress/strain distribution on bone tissue and the stress distribution on abutment screws...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222402/impact-of-anchor-type-on-porcine-lumbar-biomechanics-finite-element-modelling-and-in-vitro-validation
#15
Martin Brummund, Vladimir Brailovski, Yvan Petit, Yann Facchinello, Jean-Marc Mac-Thiong
BACKGROUND: Rigid posterior implants used for spinal stabilization can be anchored to the vertebrae using pedicle screws or screws combined with transverse process hooks. In the present study, a finite element model of a porcine lumbar spine instrumented with screws and hooks is presented and validated. METHODS: The porcine lumbar spine model was validated using in-vitro measurements on six porcine specimens. Validation metrics included intervertebral rotations (L1 to L6) and nucleus pressure in the topmost cranial instrumented disc...
February 14, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28222128/what-do-sales-data-tell-us-about-implant-survival
#16
Rudolf Seemann, Alexander Jirku, Florian Wagner, Arno Wutzl
OBJECTIVE: The aim of this study was to evaluate the influence of implant diameter, length and shape on a surrogate parameter of implant survival; i.e. the implant return rate in a big data analysis. MATERIALS AND METHODS: A retrospective study was conducted and the factors influencing the success rates of 69,377 sold implants over a seven-year period were evaluated. The osseointegration program of a reseller provides reliable data of a single country. Implant loss rates were investigated using logistic regression models and regressed by implant type, diameter, and length...
2017: PloS One
https://www.readbyqxmd.com/read/28222067/designation-and-validation-of-a-posterior-anatomical-plate-for-the-anterior-column-of-the-acetabulum
#17
Lifeng Zhang, Chuangxin Lin, Shenglu Cao, Yiran Wang, Geng Peng, Yongqiang Xu, Yongzeng Feng, Gang Wang
BACKGROUND Surgical treatment of acetabular fractures is one of the greatest challenges for orthopedic surgeons. Fixation of most displaced fractures requires extensive exposure, which may lead to complications, including blood loss, neural or vascular injury, postoperative infection, wound healing problems, and heterotopic bone formation. MATERIAL AND METHODS This study was conducted to certify an anatomic plate with an anterior column lag screw guiding device to repair the posterior acetabulum. Complete pelvic spiral computed tomography (CT) scan data were collected from 56 patients...
February 21, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28221177/semirigid-waved-rod-system-for-the-treatment-of-the-degenerative-lumbar-diseases
#18
Lei Wang, Dasheng Lin, Weitao Zou, Hui Liu, Kejian Lian
BACKGROUND: The semirigid pedicle screw instrumentation has gained wide popularity in recent decennium in lumbar fusion surgery. However, few data were documented to compare the clinical efficacy between semirigid and traditional rigid pedicle screw systems. MATERIALS AND METHODS: A total of 96 patients with degenerative lumbar diseases were selected to perform operations between 2008 and 2013. The patients were prospectively randomized into 2 groups: 50 patients were managed by semirigid waved rod systems and 46 patients were intervened by traditional rigid straight stiff rod systems...
February 17, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28219637/malreduction-of-syndesmosis-injury-associated-with-malleolar-ankle-fracture-can-be-avoided-using-weber-s-three-indexes-in-the-mortise-view
#19
Kentaro Futamura, Tomonori Baba, Atsuhiko Mogami, Itaru Morohashi, Akio Kanda, Osamu Obayashi, Kazuo Sato, Yasuhisa Ueda, Yoshiaki Kurata, Hideki Tsuji, Kazuo Kaneko
PURPOSE: Malalignment of syndesmosis is generally associated with a poor outcome, yet occurs at a high rate in malleolar ankle fractures. In this study, we examine whether malreduction of syndesmosis injury associated with malleolar ankle fracture can be avoided using Weber's three indexes in the mortise view. MATERIALS AND METHODS: Of 156 patients with malleolar ankle fracture who underwent surgery from December 2012 to March 2016 at two medical facilities, 24 patients who received syndesmotic screw fixation were included in the study...
February 14, 2017: Injury
https://www.readbyqxmd.com/read/28219416/the-safe-screw-path-along-inferior-border-of-the-arcuate-line-at-acetabular-area-an-anatomical-study-based-on-ct-scans
#20
Chun Bi, Jiandong Wang, Xiaoxi Ji, Zhijian Ma, Fang Wang, Xiangsen Zeng, Dongmei Wang, Qiugen Wang
BACKGROUND: Misplaced screw during the internal fixation of acetabular fractures may penetrate the hip joint which might cause chondrolysis and traumatic osteoarthritis in the future. This study aims to acquire the safe path for screw insertion along inferior border of the arcuate line fixation route at acetabular area. METHODS: Computed tomography (CT) scans of 98 patients without pelvic trauma were rebuilt for three-dimensional models of pelvis. After depicting the fixation route curve, five cross-sections perpendicularly to the curve were established from the anterior of pelvis to the posterior along inferior border of the arcuate line...
February 20, 2017: BMC Musculoskeletal Disorders
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