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Simon Roner, Fabio Carrillo, Lazaros Vlachopoulos, Andreas Schweizer, Ladislav Nagy, Philipp Fuernstahl
BACKGROUND: Opening-wedge osteotomies of the distal radius, performed with three-dimensional printed patient-specific instruments, are a promising technique for accurate correction of malunions. Nevertheless, reports of residual malalignments and discrepancies in the plate and screw position from the planned fixation exist. Consequently, we developed a patient-specific ramp-guide technique, combining navigation of plate positioning, osteotomy cutting, and reduction. The aim of this study is to compare the accuracy of navigation of three-dimensional planned opening-wedge osteotomies, using a ramp-guide, over state-of-the-art guide techniques relying solely on pre-drilled holes...
October 15, 2018: BMC Musculoskeletal Disorders
Weera Chaiyamongkol, Apipop Kritsaneephaiboon, Piyawat Bintachitt, Sitthiphong Suwannaphisit, Boonsin Tangtrakulwanich
Study Design: Biomechanical study. Purpose: To investigate the relative stiffness of a new posterior pelvic fixation for unstable vertical fractures of the sacrum. Overview of Literature: The reported operative fixation techniques for vertical sacral fractures include iliosacral screw, sacral bar fixations, transiliac plating, and local plate osteosynthesis. Clinical as well as biomechanical studies have demonstrated that these conventional techniques are insufficient to stabilize the vertically unstable sacral fractures...
October 16, 2018: Asian Spine Journal
Mahmood Ali Arbash, Ashik Mohsin Parambathkandi, Abdul Moeen Baco, Abduljabbar Alhammoud
Study Design: Retrospective review. Purpose: To detect the effect of cannulated (poly-axial head) and solid (mono-axial head) screws on the local kyphotic angle, vertebral body height, and superior and inferior angles between the screw and the rod in the surgical management of thoracolumbar fractures. Overview of Literature: Biomechanics studies showed that the ultimate load, yield strength, and cycles to failure were significantly lower with cannulated (poly-axial head) pedicle comparing to solid core (mono-axial head)...
October 16, 2018: Asian Spine Journal
Hubert Klauser
BACKGROUND: Various implants, for example K-wires, screws, plates or staples, have been introduced for the stabilisation of corrective osteotomies in hallux valgus surgery. To provide high initial stability and to avoid subsequent implant removal, a novel biodegradable magnesium screw (MAGNEZIX® CS, Syntellix AG, Hanover, Germany) has been developed and approved for clinical use. METHODS: Between October 2014 and June 2016, magnesium screws were used in 100 patients with a symptomatic hallux valgus deformity for the fixation of Chevron and Youngswick osteotomies...
February 16, 2018: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
Jessica E Goetz, Chamnanni Rungprai, M James Rudert, Lucian C Warth, Phinit Phisitkul
BACKGROUND: The purpose of this study was to quantify the effects of rigid syndesmotic fixation on functional talar position and cartilage contact mechanics. METHODS: Twelve below-knee cadaveric specimens with an intact distal syndesmosis were mechanically loaded in four flexion positions (20° plantar flexion, 10° plantar flexion, neutral, 10° dorsiflexion) with zero, one, or two 3.5-mm syndesmotic screws. Rigid clusters of reflective markers were used to track bony movement and ankle-specific pressure sensors were used to measure talar dome and medial/lateral gutter contact mechanics...
May 19, 2018: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
J Kruidenier, L W van der Plaat, I N Sierevelt, D Hoornenborg, D Haverkamp
BACKGROUND: With longer follow-up, survival rate of total ankle replacements (TAR) diminishes. It is therefore important to have a reliable fall-back option in case of failed TAR. Revision arthroplasty is often impossible because of loss of bonestock or infection. Conversion to ankle fusion is then indicated. We investigated the clinical, radiographic and patient reported results for fusion after failed TAR in a consecutive group of patients. We concentrated on the influence of inflammatory joint disease (IJD) on union rate...
August 24, 2018: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
Jianrong Tommie Choo, Sean Han Sheng Lai, Camelia Qian Ying Tang, Gowreeson Thevendran
BACKGROUND: The primary aim of this pilot study was to prospectively evaluate outcomes of the MgYREZr bioabsorbable screw in the setting of hallux valgus corrective surgery. The secondary aim was to compare the outcomes against a control group treated with conventional titanium screws. METHODS: A consecutive series of patients with hallux valgus deformity (n=24) underwent forefoot reconstruction surgery with a scarf osteotomy to the first metatarsal using MgYREZr screws...
September 22, 2018: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
Yogi Prabowo, Irsan Abubakar
INTRODUCTION: Giant Cell tumors (GCT) are benign tumors with potential for aggressive behavior and capacity to metastasize. Although considered to be benign tumors of bone, GCT has a relatively high recurrence rate. Tumor often extends to the articular subchondral bone or even abuts the cartilage. The joint and/or its capsule are rarely invaded. Surgical resection is the universal standard of care for the treatment of bone GCT. The key ensuring an adequate surgical treatment with complete removal of tumor is by obtaining adequate exposure of the lesion...
August 29, 2018: International Journal of Surgery Case Reports
Roman Frederik Karkosch, Max Ettinger, Samuel Bachmaier, Coen A Wijdicks, Tomas Smith
BACKGROUND: This biomechanical cadaveric in vitro study aimed to evaluate and compare the dynamic elongation behavior and ultimate failure strength of tibial adjustable-length loop cortical button versus interference screw fixation in quadriceps tendon-based anterior cruciate ligament reconstruction. METHODS: Sixteen human quadriceps tendons were harvested and fixed into porcine tibiae using either biodegradable interference screw (n = 8) or adjustable loop device (n = 8) fixation...
October 8, 2018: Clinical Biomechanics
Vit Kotheeranurak, Guang-Xun Lin, Akaworn Mahatthanatrakul, Jin-Sung Kim
No abstract text is available yet for this article.
October 12, 2018: World Neurosurgery
Anastasia Bakopoulou, Peter Hoang, Ali Fathi, Matthew Foley, Colin Dunstan, Oyku Dalci, Alexandra K Papadopoulou, M Ali Darendeliler
Objective: The aim of this study was to assess the potential of improving orthodontic miniscrews' (MSs) primary stability in vivo by evaluating the dispersion capacity of an injectable bone graft substitute (iBGS) through a newly designed hollow MS [The Sydney Mini Screw (SMS)] and its integration with the cortical and trabecular bone by using the femur and tibia in a New Zealand rabbit animal model. Methods: In total, 24 MSs were randomly placed in each proximal tibia and femur of 6 New Zealand rabbits with an open surgery process...
October 12, 2018: European Journal of Orthodontics
Ligia R Gomes, Marcus V N de Souza, Cristiane F Da Costa, James L Wardell, John Nicolson Low
The crystal structures of three salicyaldoxime compounds, namely 2-hy-droxy-4-methyl-benzaldehyde oxime, C8 H9 NO2 , 1 , 2,4-di-hydroxy-benzaldehyde oxime, C7 H7 NO3 , 2 , and 2-hy-droxy-4-meth-oxy-benzaldehyde oxime, C8 H9 NO3 , 3 , are discussed. In each compound, the hydroxyl groups are essentially coplanar with their attached phenyl group. The inter-planar angles between the C=N-O moieties of the oxime unit and their attached phenyl rings are 0.08 (9), 1.08 (15) and 6.65 (15)° in 1 , 2 and 3 , respectively...
October 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
Mikel Abasolo, Josu Aguirrebeitia, Javier Vallejo, Joseba Albizuri, Ibai Coria
Misfit is unavoidable in dental implant-supported prostheses due to machining process or inappropriate assembling, and the definition of an admissible misfit is still a controversial issue. This work aims to understand the behavior of the screws in dental implant-supported prostheses to estimate an admissible vertical misfit value in terms of screw fatigue failure. For that purpose, a finite element model of a dental implant-supported prosthesis was created and analyzed. Vertical misfits were introduced in different positions, the lower and upper screws were tightened to the bolting force values recommended by the manufacturer, and two different occlusal loads were analyzed...
October 15, 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
Robert A Evarestov, Andrei V Bandura
The possibility to use the axial point group dynamical representations for the infrared and Raman active modes classification in nanotubes is analyzed. The method proposed allows one to obtain the results of phonon symmetry analysis for nanotubes in Mulliken designations, which are traditional for molecules and crystallographic point groups. The approach suggested is applied to the phonon symmetry analysis in the single-wall carbon and MoS2 -based nanotubes. First-principles calculations of phonons in a bulk MoS2 crystal and a monolayer S-Mo-S are made...
October 14, 2018: Journal of Computational Chemistry
Hirofumi Kyutoku, Nanaka Maeda, Hiroki Sakamoto, Hiroyuki Nishimura, Kazushi Yamada
Bio-composites made of polylactic acid (PLA) matrix reinforced with cellulose fibers (CF) were prepared using a twin-screw extruder and injection molding. The CFs were coated with epoxy-based surface treatment agents. Accelerated degradation tests were carried out on these PLA/CF composites at high temperatures (60 °C) or at constant temperature and constant humidity (60 °C/70% RH), and the higher-order structure changes and degradation characteristics of the molded products were evaluated. In the accelerated degradation test at 60 °C, the thermal and mechanical properties of PLA/CF composites showed no degradation, whereas at 60 °C and 70% RH, the melting point decreased ca...
January 1, 2019: Carbohydrate Polymers
Jose Ramirez-Villaescusa, Jesús López-Torres Hidalgo, Antonio Martin-Benlloch, David Ruiz-Picazo, Francisco Gomar-Sancho
OBJECT: Adjacent segment disease (ASD) has been described as a frequent complication after a lumbar spinal fusion procedure, though its incidence and the factors related to its appearance are not well established. The radiographic signs that identify ASD in unfused segments may be a consequence of biomechanical changes induced by the fusion procedure. This study sought to analyse the incidence of radiographic changes (radiographic ASD) in all adjacent unfused segments, the clinical changes that require a second procedure (clinical ASD), and the risk factors of their appearance evaluated at different follow-up times...
October 13, 2018: British Journal of Neurosurgery
Chunxia Qin, Zhenggang Cao, Shengchi Fan, Yiqun Wu, Yi Sun, Constantinus Politis, Chunliang Wang, Xiaojun Chen
PURPOSE: Surgical navigation system (SNS) has been an important tool in surgery. However, the complicated and tedious manual selection of fiducial points on preoperative images for registration affects operational efficiency to large extent. In this study, an oral and maxillofacial navigation system named BeiDou-SNS with automatic identification of fiducial points was developed and demonstrated. METHODS: To solve the fiducial selection problem, a novel method of automatic localization for titanium screw markers in preoperative images is proposed on the basis of a sequence of two local mean-shift segmentation including removal of metal artifacts...
October 13, 2018: International Journal of Computer Assisted Radiology and Surgery
Hiroshi Miyamoto, Terumasa Ikeda, Masao Akagi
PURPOSE: To elucidate the usefulness of the pedicle marker (PM) for more accurate insertion of cervical pedicle screws (CPSs). METHODS: Artificial bone study. Fifty pedicles of five artificial bone specimens were examined. PMs were inserted in five different positions (confirmed by computed tomography (CT)); (1) insertion angle correct, insertion point too medial, (2) both insertion angle and insertion point correct, (3) insertion angle correct, insertion point too lateral, (4) insertion point correct, insertion angle too big, and (5) insertion point correct, insertion angle too small...
October 10, 2018: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
Depeng Meng, Peng Xu, Di Shen, Yu Chen, Chengdong Zhu, Chunlin Hou, Haodong Lin, Yueping Ouyang
BACKGROUND: Tension bands structures are widely used to treat transverse patellar fractures. However, many implants-related complications have been reported. The purpose of this study is to evaluate effects and compare complications of three methods used to treat transverse patellar fractures, including titanium cable tension bands, compression screws with titanium cable cerclage, and X-shaped plating technique. METHODS: From January 2010 to March 2016, 120 cases of transverse patellar fracture received open reduction and internal fixation with one of three methods: titanium cable tension band (group A), compression screws with titanium cable cerclage (group B), and X-shaped plating technique (group C)...
October 10, 2018: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
Atul Goel, Pralhad Dharurkar, Abhidha Shah, Sandeep Gore, Nilesh Bakale, Tejas Vaja
AIM: The efficacy of 'only fixation' as treatment for cervical radiculopathy is assessed. MATERIAL AND METHODS: During the period 2012 to December 2017, 21 patients who presented with primary symptoms related to cervical radiculopathy that included radiating pain, tingling paresthesia and numbness and weakness and wastingwere treated by facetal stabilization surgery that aimed at achieving segmental arthrodesis. No decompression by removal of bone, disc material or osteophyte was done...
October 10, 2018: World Neurosurgery
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