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https://www.readbyqxmd.com/read/29777960/utility-of-cement-injection-to-stabilize-split-depression-tibial-plateau-fracture-by-minimally-invasive-methods-a-finite-element-analysis
#1
D Belaid, T Vendeuvre, A Bouchoucha, F Brémand, C Brèque, P Rigoard, A Germaneau
BACKGROUND: Treatment for fractures of the tibial plateau is in most cases carried out by stable fixation in order to allow early mobilization. Minimally invasive technologies such as tibioplasty or stabilization by locking plate, bone augmentation and cement filling (CF) have recently been used to treat this type of fracture. The aim of this paper was to determine the mechanical behavior of the tibial plateau by numerically modeling and by quantifying the mechanical effects on the tibia mechanical properties from injury healing...
May 8, 2018: Clinical Biomechanics
https://www.readbyqxmd.com/read/29777918/sex-differences-in-the-spatial-distribution-of-bone-in-relation-to-incident-hip-fracture-findings-from-the-ages-reykjavik-study
#2
Elisa A Marques, Julio Carballido-Gamio, Vilmundur Gudnason, Gunnar Sigurdsson, Sigurdur Sigurdsson, Thor Aspelund, Kristin Siggeirsdottir, Lenore Launer, Gudny Eiriksdottir, Thomas Lang, Tamara B Harris
In this case-cohort study, we used data-driven computational anatomy approaches to assess within and between sex spatial differences in proximal femoral bone characteristics in relation to incident hip fracture. One hundred male and 234 female incident hip fracture cases, and 1047 randomly selected noncase subcohort participants (562 female) were chosen from the population-based AGES-Reykjavik study (mean age of 77 years). The baseline -i.e. before hip fracture- hip quantitative computed tomography scans of these subjects were analyzed using voxel-based morphometry, tensor-based morphometry, and surface-based statistical parametric mapping to assess the spatial distribution of volumetric bone mineral density (vBMD), internal structure, and cortical bone properties (thickness, vBMD and trabecular vBMD adjacent to the endosteal surface) of the proximal femur, respectively, in relation to incident hip fracture...
May 16, 2018: Bone
https://www.readbyqxmd.com/read/29777322/sensitivity-analysis-of-ultrasonic-guided-waves-propagating-in-trilayered-bone-models-a-numerical-study
#3
Tho N H T Tran, Lawrence H Le, Mauricio D Sacchi, Vu-Hieu Nguyen
The fundamental ultrasonic guided modes are consistently observed in long bones ex vivo and in vivo. However, the responses of ultrasonic guided waves to the changes of cortical thickness, cortical elastic parameters, and thickness of the overlying soft tissues are not comprehensively understood. This paper systematically presents a sensitivity analysis of leaky Lamb modes to the geometry and material characteristics of layered bone model by means of semi-analytical finite element modeling. The stratified bone model is consisted of a transversely isotropic cortex with an overlying soft tissue and underlying marrow...
May 18, 2018: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/29774956/cement-interface-and-bone-stress-in-total-hip-arthroplasty-relationship-to-head-size
#4
Teresa Alonso-Rasgado, Jose F Del-Valle-Mojica, David Jimenez-Cruz, Colin G Bailey, Tim N Board
The use of larger prosthetic femoral heads in total hip arthroplasty (THA) has increased considerably in recent years in response to the need to improve joint stability and reduce risk of dislocation. However, data suggests larger femoral heads are associated with higher joint failure rates. For cemented implants, ensuring the continued integrity of the cement mantle is key to long term fixation. This paper describes an investigation into the effect of variation in femoral head size on stresses in the acetabular cement mantle and pelvic bone...
May 18, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29772993/shoulder-lesion-in-a-69-year-old-woman
#5
Andrew J Hayden, Srinivas Kolla, Adele L Boskey, Steven Burekhovich, Chuanyong Lu, Michael Stracher, Aditya V Maheshwari
Milwaukee Shoulder Syndrome (MSS) is a painful progressive arthropathy in which hydroxyapatite crystal deposition in synovial tissue induces lysosomal release of collagenase and neutral proteases. These enzymes are destructive to periarticular tissue, including the synovium, articular cartilage, rotator cuff muscles, and the intrasynovial cortical bone. MSS predominantly occurring in women (90%) over the age of 70 years of age with a clinical history marked by recurrent joint effusions and pain, which classically worsens at night...
2018: Journal of Long-term Effects of Medical Implants
https://www.readbyqxmd.com/read/29770562/evaluation-of-dental-implant-stability-in-bone-phantoms-comparison-between-a-quantitative-ultrasound-technique-and-resonance-frequency-analysis
#6
Romain Vayron, Vu-Hieu Nguyen, Benoît Lecuelle, Guillaume Haiat
BACKGROUND: Resonance frequency analyses and quantitative ultrasound methods have been suggested to assess dental implant primary stability. PURPOSE: The purpose of this study was to compare the results obtained using these two techniques applied to the same dental implants inserted in various bone phantoms. MATERIALS AND METHODS: Different values of trabecular bone density and cortical thickness were considered to assess the effect of bone quality on the respective indicators (UI and ISQ)...
May 16, 2018: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/29769819/structural-and-biomechanical-adaptations-to-free-fall-landing-in-hindlimb-cortical-bone-of-growing-female-rats
#7
Hsin-Shih Lin, Ho-Seng Wang, Hung-Ta Chiu, Kuang-You B Cheng, Ar-Tyan Hsu, Tsang-Hai Huang
The purpose of the study was to investigate the adaptation process of hindlimb cortical bone subjected to free-fall landing training. Female Wistar rats (7 weeks old) were randomly assigned to four landing (L) groups and four age-matched control (C) groups (n = 12 per group): L1, L2, L4 L8, C1, C2, C4 and C8. Animals in the L1, L2, L4 and L8 groups were respectively subjected to 1, 2, 4 and 8 weeks of free-fall-landing training (40 cm height, 30 times/day and 5 days/week) while the C1, C2, C4 and C8 groups served as age-matched control groups...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769767/a-comparative-study-on-the-stress-distribution-around-dental-implants-in-three-arch-form-models-for-replacing-six-implants-using-finite-element-analysis
#8
Maryam Zarei, Mahmoud Jahangirnezhad, Hojatollah Yousefimanesh, Maryam Robati, Hossein Robati
Background: Dental implant is a method to replacement of missing teeth. It is important for replacing the missed anterior teeth. In vitro method is a safe method for evaluation of stress distribution. Finite element analysis as an in vitro method evaluated stress distribution around replacement of six maxillary anterior teeth implants in three models of maxillary arch. Materials and Methods: In this in vitro study, using ABAQUS software (Simulia Corporation, Vélizy-Villacoublay, France), implant simulation was performed for reconstruction of six maxillary anterior teeth in three models...
March 2018: Journal of Indian Society of Periodontology
https://www.readbyqxmd.com/read/29769754/detection-of-bone-loss-via-subchondral-bone-analysis
#9
Jean-Baptiste Vimort, Antonio Ruellas, Jack Prothero, J S Marron, Matthew McCormick, Lucia Cevidanes, Erika Benavides, Beatriz Paniagua
To date, there is no single sign, symptom, or test that can clearly diagnose early stages of Temporomandibular Joint Osteoarthritis (TMJ OA). However, it has been observed that changes in the bone occur in early stages of this disease, involving structural changes both in the texture and morphometry of the bone marrow and the subchondral cortical plate. In this paper we present a tool to detect and highlight subtle variations in subchondral bone structure obtained from high resolution Cone Beam Computed Tomography (hr-CBCT) in order to help with detecting early TMJ OA...
February 2018: Proceedings of SPIE
https://www.readbyqxmd.com/read/29769605/sex-difference-in-bone-architecture-and-bone-fragility-in-vietnamese
#10
Lan T Ho-Pham, Thao P Ho-Le, Linh D Mai, Tam M Do, Minh C Doan, Tuan V Nguyen
This study sought to define the sex-difference in trabecular and cortical bone parameters in Vietnamese individuals. The study involved 1404 women and 864 men aged between 20 and 86 years who were recruited from Ho Chi Minh City, Vietnam. Trabecular and cortical volumetric BMD were measured at the proximal tibia and proximal radius at 4%, 38%, and 66% points, using a peripheral quantitative computed tomography XCT2000 (Stratec, Germany). Polar strength strain index was estimated from cortical bone parameters...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29764383/an-automated-algorithm-for-the-detection-of-cortical-interruptions-and-its-underlying-loss-of-trabecular-bone-a-reproducibility-study
#11
M Peters, J de Jong, A Scharmga, A van Tubergen, P Geusens, D Loeffen, R Weijers, S K Boyd, C Barnabe, K S Stok, B van Rietbergen, J van den Bergh
BACKGROUND: We developed a semi-automated algorithm that detects cortical interruptions in finger joints using high-resolution peripheral quantitative computed tomography (HR-pQCT), and extended it with trabecular void volume measurement. In this study we tested the reproducibility of the algorithm using scan/re-scan data. METHODS: Second and third metacarpophalangeal joints of 21 subjects (mean age 49 (SD 11) years, 17 early rheumatoid arthritis and 4 undifferentiated arthritis, all diagnosed < 1 year ago) were imaged twice by HR-pQCT on the same day with repositioning between scans...
May 15, 2018: BMC Medical Imaging
https://www.readbyqxmd.com/read/29764198/temporal-bone-contrast-enhanced-high-resolution-ct-evaluation-of-pulsatile-tinnitus-after-sigmoid-sinus-wall-reconstruction
#12
Heyu Ding, Pengfei Zhao, Han Lv, Xuehuan Liu, Rong Zeng, Guopeng Wang, Shusheng Gong, Zhenchang Wang
Background Sigmoid sinus wall reconstruction (SSWR) is a proven effective treatment for pulsatile tinnitus (PT) caused by sigmoid sinus wall dehiscence (SSWD) with or without sigmoid sinus diverticulum (SSD); however, comprehensive analysis of the postoperative imaging manifestations has not yet been reported. Purpose To analyze temporal bone computed tomography (CT) imaging features following SSWR in patients with PT. Material and Methods Following SSWR, temporal bone contrast-enhanced high-resolution CT (HRCT) images from 33 PT cases were retrospectively analyzed...
January 1, 2018: Acta Radiologica
https://www.readbyqxmd.com/read/29763336/adjustable-loop-femoral-cortical-suspensory-fixation-for-patellar-tendon-anterior-cruciate-ligament-reconstruction-a-time-zero-biomechanical-comparison-with-interference-screw-fixation
#13
Dayne T Mickelson, Thomas Lefebvre, Ken Gall, Jonathan C Riboh
BACKGROUND: Adjustable-loop cortical buttons for femoral fixation of bone-tendon-bone grafts have potential advantages over interference screw fixation; however, these devices have not been benchmarked biomechanically against interference screws. Purpose/Hypothesis: The purpose was to compare the time zero biomechanical properties of commercially available, adjustable-loop cortical button and metallic interference screws for femoral fixation of bone-tendon-bone grafts. It was hypothesized that no significant differences would be found in biomechanical properties between fixation techniques...
May 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29761748/transfemoral-amputation-adductor-myodesis-using-fibertape-and-knotless-anchors
#14
Andrew R Hsu
Transfemoral amputation is considered the last treatment option for severe infection, vascular disease, trauma, and malignant tumors of the lower extremity that have failed limb salvage. Unopposed pull of the hip abductors causes a flexion-abduction thigh deformity that results in abnormal biomechanics and increased oxygen consumption during ambulation. Myodesis of the adductor tendons is a critical component of transfemoral amputation that creates dynamic muscle balance, enhances prosthetic fitting and function, and improves clinical outcomes...
May 1, 2018: Foot & Ankle International
https://www.readbyqxmd.com/read/29759948/measuring-relative-positions-and-orientations-of-the-tibia-with-respect-to-the-femur-using-one-channel-3d-tracked-a-mode-ultrasound-tracking-system-a-cadaveric-study
#15
Kenan Niu, Jasper Homminga, Victor Sluiter, André Sprengers, Nico Verdonschot
The purpose of this study is to investigate the technical feasibility of measuring relative positions and orientations of the tibia with respect to the femur in an in-vitro experiment by using a 3D-tracked A-mode ultrasound system and to determine its accuracy of angular and translational measurements. As A-mode ultrasound is capable of detecting bone surface through soft tissue in a non-invasive manner, the combination of a single A-mode ultrasound transducer with an optical motion tracking system provides the possibility for digitizing the 3D locations of bony points at different anatomical regions on the thigh and the shank...
May 11, 2018: Medical Engineering & Physics
https://www.readbyqxmd.com/read/29757601/fluorescence-detection-of-bone-microcracks-using-monophosphonated-carbon-dots
#16
Fatemeh Ostadhossein, Lily Benig, Indu Tripathi, Santosh K Misra, Dipanjan Pan
Phosphonated compounds, in particular, bis-analogs are widely applied in clinical settings for the treatment of severe bone turnovers and recently as imaging probes when conjugated with organic fluorophores. Herein, we introduce a bone seeking luminescent probe that shows high binding affinity towards bone minerals based on monophosphonated carbon dots (CDs). The spheroidal CDs tethered with PEG monophosphates are synthesized in a one pot hydrothermal method and are physico-chemically characterized where the retention of phosphonates is confirmed by 13P NMR and XPS...
May 14, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29756610/the-hump-columellar-strut-a-reliable-technique-for-correction-of-nasal-tip-underprojection
#17
P G Giacomini, S Mocella, S DI Girolamo, R DE Berardinis, A Boccieri
Nasal tip under projection is often found in rhinoplasty cases both for congenital or post-traumatic deformity. Nasal trauma may result in alteration of the external and internal nasal structures with following aesthetic impairment and difficulties in breathing. Post-traumatic surgery is frequent, but restoration of pre-traumatic form and function remains a challenge. The present paper describes a new method to increase tip projection by a columellar strut harvested from the autologous nasal bone and cartilage of the resected hump...
February 2018: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/29753697/giant-dentinogenic-ghost-cell-tumor-a-case-report
#18
Ciro Dantas Soares, Roman Carlos, Thayná Melo de Lima Morais, Oslei Paes de Almeida
Dentinogenic ghost cell tumor (DGCT), a rare, benign odontogenic tumor with aggressive behavior, causes bone destruction and cortical expansion. We report here a case of DGCT in a 38-year-old male, presenting with enormous extraoral protrusion, which radiographically was predominantly radiolucent with radiopaque areas. Microscopically, it was observed to be a solid ameloblastomatous proliferation with pseudoglandular structures associated with clusters of ghost cells. Abundant dentinoid material adjacent to the epithelial sheets containing entrapped epithelial tumor cells was also evident...
April 18, 2018: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/29751744/a-case-of-raine-syndrome-presenting-with-facial-dysmorphy-and-review-of-literature
#19
Jayesh Sheth, Riddhi Bhavsar, Ajit Gandhi, Frenny Sheth, Dhairya Pancholi
BACKGROUND: Raine syndrome (RS) - an extremely rare autosomal recessive genetic disorder, is caused by a biallelic mutation in the FAM20C gene. Some of the most common clinical features include generalized osteosclerosis with a periosteal bone formation, dysmorphic face, and thoracic hypoplasia. Many cases have also been reported with oro-dental abnormalities, and developmental delay. Most of the cases result in neonatal death. However, a few non-lethal RS cases have been reported where patients survive till adulthood and exhibits a heterogeneous clinical phenotype...
May 11, 2018: BMC Medical Genetics
https://www.readbyqxmd.com/read/29751369/central-giant-cell-lesion-of-the-jaws-an-updated-analysis-of-2270-cases-reported-in-the-literature
#20
REVIEW
Bruno Ramos Chrcanovic, Carolina Cavalieri Gomes, Ricardo Santiago Gomez
PURPOSE: To review all available data published on central giant cell lesion (CGCL) of the jaws into a comprehensive analysis of its clinical/radiologic features, with emphasis on the predictive factors associated with its recurrence. METHODS: An electronic search was undertaken in 5 databases (February/2018), looking for reporting cases of CGCLs. RESULTS: 365 publications were included, comprising 2270 lesions. CGCLs were more prevalent in women and the mandible...
May 11, 2018: Journal of Oral Pathology & Medicine
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