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Ring fixator

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https://www.readbyqxmd.com/read/28938392/segmental-bone-loss-reconstruction-using-ring-fixation
#1
Stephen M Quinnan
Ring fixation is a powerful tool in the treatment of bone defects. The ability to create high-quality, biologically normal new bone of even massive proportions using distraction osteogenesis is a major reason for its success. In addition, ring fixation provides the ability to limit the risk of deep infection, improves flexibility in limb length control and alignment, and increases soft tissue coverage options. The drawbacks of ring fixation include long frame times, pin problems, risk of joint contractures, and difficult usage in areas with a large soft tissue envelope such as the thigh...
October 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28934542/complications-associated-with-pelvic-external-fixation
#2
Christopher McDonald, Reza Firoozabadi, M L Routt, Conor Kleweno
An external fixator is an essential tool for treating unstable pelvic ring injuries but its use carries risks, including pin-site infections and injury to the lateral femoral cutaneous nerve (LFCN). Surgeons currently lack data regarding these risks for patient counseling. This study aimed to identify the incidence of and risk factors for superficial and deep pin-site infection and LFCN damage. Fifty-two patients who underwent pelvic external fixation with anterior pin placement as part of definitive treatment for unstable pelvic ring disruption were retrospectively evaluated to identify factors associated with the development of infection...
September 21, 2017: Orthopedics
https://www.readbyqxmd.com/read/28925750/study-of-the-x-ray-diagnosis-of-unstable-pelvic-fracture-displacements-in-three-dimensional-space-and-its-application-in-closed-reduction
#3
Chengdi Shi, Leyi Cai, Wei Hu, Junying Sun
ABSTRACTS Objective: To study the method of X-ray diagnosis of unstable pelvic fractures displaced in three-dimensional (3D) space and its clinical application in closed reduction. METHODS: Five models of hemipelvic displacement were made in an adult pelvic specimen. Anteroposterior radiographs of the pelvis were analyzed in PACS. The method of X-ray diagnosis was applied in closed reductions. From February 2012 to June 2016, 23 patients (15 men, 8 women; mean age, 43.4 years) with unstable pelvic fractures were included...
September 19, 2017: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/28917396/modified-bean-shaped-ring-segments-for-suture-fixation-of-the-bag-in-the-lens-intraocular-implant
#4
Sorcha Ní Dhubhghaill, Anca Cristina Dogaroiu, Nadia Zakaria, Marie-José Tassignon
We describe a surgical technique for secondary stabilization of a bag-in-the-lens intraocular lens (BIL IOL) using 2 modified bean-shaped ring segments in cases of zonular dehiscence associated with pseudophakodonesis. The first modified bean segment is anchored in the sulcus with a suture to the sclera in the area of maximum zonular dehiscence, and the second segment is implanted in the opposite sulcus area. Both segments are placed in the BIL IOL interhaptic groove. The segments stabilize and center the BIL IOL by creating an artificial zonule that provides the necessary extra support for the IOL...
August 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28910168/reduced-central-retinal-artery-blood-flow-is-related-to-impaired-central-visual-function-in-retinitis-pigmentosa-patients
#5
Samantha Kayser, Patricia Vargas, Deborah Mendelsohn, Jorge Han, Hua Bi, Alexandra Benavente, Ava K Bittner
PURPOSE: We evaluated the test-retest repeatability of blood flow velocities in the retrobulbar central retinal artery (CRA) and explored whether reduced blood flow is related to the degree of visual function loss in retinitis pigmentosa (RP) patients with wide range of disease severity. MATERIALS AND METHODS: We measured CRA peak systolic velocity (PSV) and end diastolic velocity (EDV) to calculate mean flow velocity (MFV) in 18 RP patients using color Doppler imaging with spectral flow Doppler (GE Logiq7 ultrasound) twice in each eye at each of two visits within a month...
September 14, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28893435/gradual-bone-transfer-for-the-correction-of-the-pubic-diastasis-using-the-ilizarov-technique-in-closure-of-bladder-and-cloacal-exstrophy
#6
Hiroshi Kusakabe, Katsuhiko Ueoka, Shinichiro Takayama, Atsuhito Seki
BACKGROUND: In the patient of the cloacal exstrophy, cloaca with local abdominal wall is disrupted and exposed inner surface of the bladder needs early closure. Pelvic osteotomies are required for severe cases whose bladder cannot be closed by the suture of soft tissue only. We developed a technique involving the gradual positioning of bone fragments using a light, Ilizarov external fixator. The usefulness of the technique was assessed. METHODS: We enrolled 3 patients with cloacal exstrophy and 1 with bladder exstrophy as a gradual transfer group and 6 patients who were treated by other osteotomies as a control group...
September 8, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28891656/implied-reading-direction-and-prioritization-of-letter-encoding
#7
Alex O Holcombe, Elizabeth H L Nguyen, Patrick T Goodbourn
Capacity limits hinder processing of multiple stimuli, contributing to poorer performance for identifying two briefly presented letters than for identifying a single letter. Higher accuracy is typically found for identifying the letter on the left, which has been attributed to a right-hemisphere dominance for selective attention. Here, we use rapid serial visual presentation (RSVP) of letters in two locations at once. The letters to be identified are simultaneous and cued by rings. In the first experiment, we manipulated implied reading direction by rotating or mirror-reversing the letters to face to the left rather than to the right...
September 11, 2017: Journal of Experimental Psychology. General
https://www.readbyqxmd.com/read/28889364/open-complete-anterior-dislocation-of-the-sacro-iliac-joint-in-a-4-year-old-boy-a-case-report-of-a-rare-injury-with-5-year-follow-up
#8
Walid A Elnahal, Mahmoud Fahmy, Mehool Acharya
Pelvic fractures are uncommon in children and account for between 0.3 and 7.5% of all pediatric injuries. Open pelvic fractures only account for up to 12.9% of all pediatric pelvic fractures. An unusual case of open complete anterior sacro-iliac joint dislocation in a 4-year-old boy is presented with a long-term follow-up. The multidisciplinary approach is reported with review of the current literature. A 4-year-old male presented to our institution in January 2012 after having been run over by a tractor. He presented with gross hemodynamical instability, MISS of 25, and an unstable lateral compression type III pelvic fracture with complete anterior dislocation of the left hemipelvis and a groin wound extending into the left thigh...
September 9, 2017: Strategies in Trauma and Limb Reconstruction
https://www.readbyqxmd.com/read/28876274/a-prospective-randomized-trial-to-assess-fixation-strategies-for-severe-open-tibia-fractures-modern-ring-external-fixators-versus-internal-fixation-fixit-study-erratum
#9
(no author information available yet)
No abstract text is available yet for this article.
September 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28862709/different-effects-of-aging-and-gender-on-the-temporal-resolution-in-attentional-tracking
#10
Eugenie Roudaia, Jocelyn Faubert
The current study examined the role of temporal resolution of attention in the decline in multiple object tracking abilities with healthy aging. The temporal resolution of attention is known to limit attentional tracking of one and multiple targets (Holcombe & Chen, 2013). Here, we examined whether aging is associated with a lower temporal resolution of attention when tracking one target, the efficiency of splitting attention across multiple targets, or both. Stimuli comprised three concentric rings containing five or 10 equally spaced dots...
September 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28860405/the-use-of-an-anterior-pelvic-internal-fixator-to-treat-disruptions-of-the-anterior-pelvic-ring-a-report-of-technique-indications-and-complications
#11
M Dahill, J McArthur, G L Roberts, M R Acharya, A J Ward, T J S Chesser
AIMS: The anterior pelvic internal fixator is increasingly used for the treatment of unstable, or displaced, injuries of the anterior pelvic ring. The evidence for its use, however, is limited. The aim of this paper is to describe the indications for its use, how it is applied and its complications. PATIENTS AND METHODS: We reviewed the case notes and radiographs of 50 patients treated with an anterior pelvic internal fixator between April 2010 and December 2015 at a major trauma centre in the United Kingdom...
September 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28859845/guide-wire-insertion-for-percutaneous-lc2-screws-in-acetabular-and-pelvic-ring-fixation-using-a-transpedicular-working-cannula
#12
Julian Scherer, Pierre Guy, Kelly A Lefaivre, Hans-Christoph Pape, Clément M L Werner, Georg Osterhoff
Closed reduction and percutaneous screw fixation (CRIF) of iliac crescent fractures and fractures of the anterior column of the acetabulum has become an established method in the treatment of these injuries. After reduction, safe insertion of a guide wire is a key step during this procedure. We present a technique that can facilitate introducing the guide wire under fluoroscopic guidance and allow for decreased radiation exposure.
August 25, 2017: Injury
https://www.readbyqxmd.com/read/28842239/endoscopic-endonasal-odontoidectomy-with-anterior-c1-arch-preservation-in-reumathoid-arthritis-long-term-follow-up-and-further-technical-improvement-by-anterior-endoscopic-c1-c2-screw-fixation-and-fusion
#13
Maurizio Iacoangeli, Davide Nasi, Roberto Colasanti, Baogen Pan, Massimo Re, Alessandro Di Rienzo, Lucia di Somma, Mauro Dobran, Nicola Specchia, Massimo Scerrati
OBJECTIVE: To examine the long-term outcomes (minimum of 4,5 years) of endoscopic endonasal odontoidectomy (EEO) with preservation of anterior C1 ring to treat irreducible ventral bulbo-medullary compressions in rheumatoid arthritis (RA) and to illustrate a novel technique of anterior pure endoscopic craniovertebral junction (CVJ) reconstruction and fusion. In fact, long-term clinical studies are still lacking to elucidate the effective role of EEO and whether it can obviate the need for posterior fixation...
August 22, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28829114/topological-polymer-chemistry-designing-complex-macromolecular-graph-constructions
#14
Yasuyuki Tezuka
The precision design of topologically intriguing macromolecular architectures has continuously been an attractive challenge in polymer science and polymer materials engineering. A class of multicyclic polymer topologies, including three subclasses of spiro, bridged, and fused forms, are particularly unique not only from a topological geometry viewpoint but also from their biochemical relevance to programmed folding structures. In this Account, we describe recent progress in constructing this class of macromolecules, in particular by means of an electrostatic self-assembly and covalent fixation (ESA-CF) protocol, in which ion-paired polymer self-assemblies are employed as key intermediates...
August 22, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28810966/the-importance-of-medical-readiness-training-exercises-maintaining-medical-readiness-in-a-low-volume-combat-casualty-flow-era
#15
Kelly C Mead, David J Tennent, Daniel J Stinner
INTRODUCTION: Ringed external fixation has demonstrated promising results in the management of severe combat-related extremity injuries. The purpose of this study was to identify and compare rates of wartime-related surgical cases at times of high and low casualty time periods, and then compare these case numbers with those performed during a 2-week Medical Readiness Training Exercise (MEDRETE) in Honduras. MATERIALS AND METHODS: A retrospective review was performed of patients treated at a single Military Treatment Facility with definitive ringed external fixators during a 2-year period of high-volume combat casualty flow (January 2009-December 2010) and a subsequent 2-year period of low-volume combat casualty flow (January 2013-December 2014)...
July 2017: Military Medicine
https://www.readbyqxmd.com/read/28809642/fibular-strut-graft-for-posterior-pelvic-ring-nonunion-a-case-report
#16
M Frank, J R McCallum, T Dědek
Posttraumatic pelvic nonunions in combination with malposition are uncommon in the present-day era of modern pelvic surgery. The case describes a new surgical technique for treatment of the nonunion localized to iliosacral joint. A 42-year-old polytraumatized male presented with a pelvic fracture (type 61-C2.3) associated with a complex acetabular fracture. The patient was treated and the pelvis stabilized according to damage control principles (external fixation and pelvic C-clamp) and subsequently definitively treated according to principles of current pelvic surgery...
2017: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28799989/new-trends-in-ring-fixators
#17
Christopher A Iobst
Multiple versions of ring fixators are currently available to orthopaedic surgeons. Although the traditional Ilizarov-type ring fixator is still available, many surgeons are now using computer-assisted hexapod frames. There has been a recent surge in the number of different hexapod ring fixators on the market. This article will review some of the new trends in ring fixator hardware and software as well as discuss possible future directions of ring fixator development.
September 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28799855/surgical-management-of-cervical-spine-deformity-in-chondrodysplasia-punctata
#18
Nobuhito Morota, Satoshi Ihara, Hideki Ogiwara, Goichiro Tamura
OBJECTIVE Chondrodysplasia punctata (CDP), a rare skeletal dysplasia, can lead to cervical spine instability and deformity. However, an optimal neurosurgical intervention has yet to be established. Thus, a retrospective study was conducted to assess the efficacy of various surgical interventions for children with CDP. METHODS The authors retrospectively reviewed 9 cases of CDP in which cervical decompression with or without posterior fusion was performed between April 2007 and May 2016. Patient demographics, preoperative clinical conditions, radiographic findings, surgical procedures, and the postoperative course were analyzed in detail...
August 11, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28791464/a-computed-tomographic-anatomical-study-of-the-upper-sacrum-application-for-a-user-guide-of-pelvic-fixation-with-iliosacral-screws-in-adult-spinal-deformity
#19
Arnaud Dubory, Houssam Bouloussa, Guillaume Riouallon, Stéphane Wolff
PURPOSE: Widely used in traumatic pelvic ring fractures, the iliosacral (IS) screw technique for spino-pelvic fixation remains anecdotal in adult spinal deformity. The objective of this study was to assess anatomical variability of the adult upper sacrum and to provide a user guide of spino-pelvic fixation with IS screws in adult spinal deformity. METHODS: Anatomical variability of the upper sacrum according to age, gender, height and weight was sought on 30 consecutive pelvic CT-scans...
August 8, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28774257/a-case-of-non-union-of-ulna-fracture-managed-with-tibial-strut-cortico-cancellous-bone-grafting-in-a-paediatric-patient
#20
Collin S K Looi, Roohi S A, Ranjit Singh Gill
Forearm fractures in children complicated with non-union are uncommon. Various methods have previously been reported to manage this condition. Well documented techniques would include iliac crest grafting, cancellous insert grafting, ulnar segment grafting, cortical tibial grafting, vascularized fibular grafting and bone transport by ring fixation. The authors present a case of a child with an atrophic non-union of the ulna who was successfully treated with a cortico-cancellous tibial strut bone graft.
September 2017: Journal of Hand Surgery Asian-Pacific Volume
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