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Tibia geometry

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https://www.readbyqxmd.com/read/29447236/the-influence-of-a-change-in-the-meniscus-cross-sectional-shape-on-the-medio-lateral-translation-of-the-knee-joint-and-meniscal-extrusion
#1
Piotr Luczkiewicz, Karol Daszkiewicz, Wojciech Witkowski, Jacek Chróścielewski, Tomasz Ferenc, Boguslaw Baczkowski
OBJECTIVE: The purpose of this study was to evaluate the influence of a change in the meniscus cross sectional shape on its position and on the biomechanics of a knee joint. METHODS: One main finite element model of a left knee joint was created on the basis of MRI images. The model consisted of bones, articular cartilages, menisci and ligaments. Eight variants of this model with an increased or decreased meniscus height were then prepared. Nonlinear static analyses with a fixed flexion/extension movement for a compressive load of 1000 N were performed...
2018: PloS One
https://www.readbyqxmd.com/read/29401510/physiological-joint-line-total-knee-arthroplasty-designs-are-especially-sensitive-to-rotational-placement-a-finite-element-analysis
#2
Philippe Moewis, Sara Checa, Ines Kutzner, Hagen Hommel, Georg N Duda
Mechanical and kinematical aligning techniques are the usual positioning methods during total knee arthroplasty. However, alteration of the physiological joint line and unbalanced medio-lateral load distribution are considered disadvantages in the mechanical and kinematical techniques, respectively. The aim of this study was to analyse the influence of the joint line on the strain and stress distributions in an implanted knee and their sensitivity to rotational mal-alignment. Finite element calculations were conducted to analyse the stresses in the PE-Inlay and the mechanical strains at the bone side of the tibia component-tibia bone interface during normal positioning of the components and internal and external mal-rotation of the tibial component...
2018: PloS One
https://www.readbyqxmd.com/read/29395720/distal-femoral-rotation-correlates-with-proximal-tibial-joint-line-obliquity-a-consideration-for-kinematic-total-knee-arthroplasty
#3
Chung Kia Ng, Jerry Yongqiang Chen, Jared Ze Yang Yeh, Jade Pei Yuik Ho, Azhar M Merican, Seng Jin Yeo
BACKGROUND: We hypothesized that there is a correlation between the distal femoral rotation and proximal tibial joint line obliquity in nonarthritic knees. This has significance for kinematic knee arthroplasty, in which the target knee alignment desired approximates the knee before disease. METHODS: Fifty computed tomography scans of nonarthritic knees were evaluated using three-dimensional image processing software. Four distal femoral rotational axes were determined in the axial plane: the transepicondylar axis (TEA), transcondylar axis (TCA), posterior condylar axis (PCA), and a line perpendicular to Whiteside's anterior-posterior axis...
December 28, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29394444/new-reference-pmhs-tests-to-assess-whole-body-pedestrian-impact-using-a-simplified-generic-vehicle-front-end
#4
Eric Song, Philippe Petit, Xavier Trosseille, Jerome Uriot, Pascal Potier, Denis Dubois, Richard Douard
This study aims to provide a set of reference post-mortem human subject tests which can be used, with easily reproducible test conditions, for developing and/or validating pedestrian dummies and computational human body models against a road vehicle. An adjustable generic buck was first developed to represent vehicle front-ends. It was composed of four components: two steel cylindrical tubes screwed on rigid supports in V-form represent the bumper and spoiler respectively, a quarter of a steel cylindrical tube represents the bonnet leading edge, and a steel plate represents the bonnet...
November 2017: Stapp Car Crash Journal
https://www.readbyqxmd.com/read/29382612/familial-resemblance-in-trabecular-and-cortical-volumetric-bone-mineral-density-and-bone-microarchitecture-as-measured-by-hrpqct
#5
Yi Yang, Feng Pan, Feitong Wu, Kathryn Squibb, Russell Thomson, Tania Winzenberg, Graeme Jones
To estimate the heritability of bone geometry, volumetric bone mineral density (vBMD) and microarchitecture of trabecular (Tb) and cortical (Ct) bone measured by high resolution peripheral quantitative computerised tomography (HRpQCT) at the distal radius and tibia and to investigate the genetic correlations of these measures. Participants were 177 mother-offspring pairs from 162 families (mothers, mean age (SD) = 52.1 (4.7) years; offspring, 25.6 (0.73) years). Trabecular and cortical bone measures were obtained by HRpQCT...
January 27, 2018: Bone
https://www.readbyqxmd.com/read/29373588/subsequent-somatic-axis-and-bone-tissue-metabolism-responses-to-a-low-zinc-diet-with-or-without-phytase-inclusion-in-broiler-chickens
#6
Siemowit Muszyński, Ewa Tomaszewska, Małgorzata Kwiecień, Piotr Dobrowolski, Agnieszka Tomczyk-Warunek
Zinc is required for normal bone development and cartilage formation. The purpose of this study was to assess the effect of with adding organic Zn (alone or phytase inclusion) at the reduced dose to growing male Ross 308 chickens on somatic axis and bone tissue metabolism. 200 one-day old broilers were divided into the negative control group fed diet without Zn or phytase inclusion, positive control group receiving Zn in the 100% of daily recommended dose from ZnO, and two experimental groups fed diet introduced Zn in 25% of daily recommendation as a glycine chelate (Zn-Gly) with or without phytase inclusion (500 FTU·kg-1)...
2018: PloS One
https://www.readbyqxmd.com/read/29344931/relationship-between-body-mass-lean-mass-fat-mass-and-limb-bone-cross-sectional-geometry-implications-for-estimating-body-mass-and-physique-from-the-skeleton
#7
Emma Pomeroy, Alison Macintosh, Jonathan C K Wells, Tim J Cole, Jay T Stock
OBJECTIVES: Estimating body mass from skeletal dimensions is widely practiced, but methods for estimating its components (lean and fat mass) are poorly developed. The ability to estimate these characteristics would offer new insights into the evolution of body composition and its variation relative to past and present health. This study investigates the potential of long bone cross-sectional properties as predictors of body, lean, and fat mass. MATERIALS AND METHODS: Humerus, femur and tibia midshaft cross-sectional properties were measured by peripheral quantitative computed tomography in sample of young adult women (n = 105) characterized by a range of activity levels...
January 18, 2018: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/29322073/high-fat-high-sucrose-diet-results-in-higher-bone-mass-in-aged-rats
#8
Akira Minematsu, Yasue Nishii, Susumu Sakata
Intake of high-fat/high-sucrose (HFS) diet or high fat diet influences bone metabolism in young rodents, but its effects on bone properties of aged rodents still remain unclear. This study aimed to examine the effects of HFS diet intake on trabecular bone architecture (TBA) and cortical bone geometry (CBG) in aged rats. Fifteen male Wistar rats over 1 year were randomly divided into two groups. One group was fed a standard laboratory diet (SLD) and the other group was fed a HFS diet for six months. The femur/tibia, obtained from both groups at the end of experimental period, were scanned by micro-computed tomography for TBA/CBG analyses...
June 2018: Bone Reports
https://www.readbyqxmd.com/read/29310669/the-tibial-growth-plate-as-a-predictor-of-the-original-tibial-plateau-joint-line-as-a-reference-for-kinematically-aligned-total-knee-arthroplasty
#9
Katsuya Nagai, Yasuo Niki, Kengo Harato, Shu Kobayashi, Takeo Nagura, Takayuki Nakamura, Morio Matsumoto, Masaya Nakamura
BACKGROUND: Restoration of the natural joint line is a cornerstone for kinematically aligned total knee arthroplasty (TKA). The purpose of this study was to investigate the relative orientation of the tibial growth plate (GP) with respect to the tibial plateau (TP) for possible application in predicting natural joint line for knees with highly advanced osteoarthritis patient at the time of kinematically aligned TKA. METHODS: Images from computed tomography (CT) of 27 normal knees (9 males, 18 females; mean age, 31...
January 8, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29215679/accelerated-healing-period-with-hydrophilic-implant-placed-in-sheep-tibia
#10
Suelen Cristina Sartoretto, José de Albuquerque Calasans-Maia, Yanan Osório da Costa, Rafael Seabra Louro, José Mauro Granjeiro, Mônica Diuana Calasans-Maia
The objective of this study was to evaluate the early osseointegration of two different implants surfaces, a sandblasted and acid-etched surface (TN) compared with same geometry and surface roughness modified to be hydrophilic/wettable by conditioning in an isotonic solution of 0.9% sodium-chloride (TA) through histological and histomorphometric analysis after sheep tibia implantation. Forty dental implants, divided in two groups (TN and TA) were placed in the left tibia of twenty healthy, skeletally mature Santa Ines sheep (n=5/experimental period)...
September 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29173552/the-influence-of-tibial-and-femoral-bone-morphology-on-knee-kinematics-in-the-anterior-cruciate-ligament-injured-knee
#11
REVIEW
Drew Lansdown, Chunbong Benjamin Ma
Bone morphology is one feature that contributes to knee kinematics. The geometry of the tibia and femur vary across individuals, and these differences can influence the risk of anterior cruciate ligament (ACL) injury and of failure after isolated ACL reconstruction. There has been renewed interest in lateral extra-articular stabilization procedures to supplement an ACL reconstruction, although which patients benefit most from these procedures remains unclear. This article reviews the impact of bone morphology on knee kinematics, including tibial slope, depth of the medial tibial plateau, intercondylar notch shape, tibial eminence volume, and sphericity of the femoral condyles...
January 2018: Clinics in Sports Medicine
https://www.readbyqxmd.com/read/29163188/elevated-levels-of-peripheral-kynurenine-decrease-bone-strength-in-rats-with-chronic-kidney-disease
#12
Bartlomiej Kalaska, Krystyna Pawlak, Tomasz Domaniewski, Ewa Oksztulska-Kolanek, Beata Znorko, Alicja Roszczenko, Joanna Rogalska, Malgorzata M Brzoska, Pawel Lipowicz, Michal Doroszko, Anna Pryczynicz, Dariusz Pawlak
The diagnosis and treatment of bone disorders in patients with chronic kidney disease (CKD) represent a clinical challenge. CKD leads to mineral and bone complications starting early in the course of renal failure. Recently, we have observed the positive relationship between intensified central kynurenine turnover and bone strength in rats with subtotal 5/6 nephrectomy (5/6 Nx)-induced CKD. The aim of the present study was to determine the association between peripheral kynurenine pathway metabolites and bone strength in rats with 5/6 Nx-induced CKD...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28938787/influence-of-age-and-housing-systems-on-properties-of-tibia-and-humerus-of-lohmann-white-hens1-bone-properties-of-laying-hens-in-commercial-housing-systems
#13
P Regmi, N Nelson, R C Haut, M W Orth, D M Karcher
This study was aimed at analyzing bone properties of Lohmann White hens in different commercial housing systems at various points throughout production. Pullets reared in conventional cages (CC) were either continued in CC or moved to enriched colony cages (EN) at 19 weeks. Pullets reared in cage-free aviaries (AV) were moved to AV hen houses. Bone samples were collected from 60 hens at each of 18 and 72 wk and 30 hens at 26 and 56 wk from each housing system. Left tibiae and humeri were broken under uniform bending to analyze mechanical properties...
October 1, 2017: Poultry Science
https://www.readbyqxmd.com/read/28926125/the-prevalence-of-vertebral-fractures-is-associated-with-reduced-hip-bone-density-and-inferior-peripheral-appendicular-volumetric-bone-density-and-structure-in-older-women
#14
Lisa Johansson, Daniel Sundh, Michael Zoulakis, Robert Rudäng, Anna Darelid, Helena Brisby, Anna G Nilsson, Dan Mellström, Mattias Lorentzon
Vertebral fractures (VF) are among the most severe and prevalent osteoporotic fractures. Their association with bone microstructure have been investigated in several retrospective case-control studies with spine radiography for diagnosis of VF. The aim of this population-based cross-sectional study of 1027 women aged 75-80 years, was to investigate if prevalent VF, identified by vertebral fracture assessment (VFA) by dual-energy X-ray absorptiometry (DXA), was associated with appendicular volumetric bone density, structure and bone material strength index (BMSi), independently of hip areal bone mineral density (aBMD)...
September 19, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28914139/the-influence-of-geometric-design-variables-on-the-kinematic-performance-of-a-surface-guided-total-knee-replacement
#15
Shabnam Pejhan, Eric Bohm, Jan-Mels Brandt, Urs Wyss
OBJECTIVE: Tibiofemoral geometries in a total knee replacement (TKR) affect the performance of an implant during activities of daily living. The specially shaped components of a surface-guided TKR aim to control the tibiofemoral motion, such that a normal pattern of motion is achieved, even at high flexion angles. The purpose of this study was to assess the influence of the design parameters on the kinematic behavior of such an implant. A combination of design variables was determined that resulted in the least deviation from the design kinematic target...
September 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28910722/analysis-of-in-vivo-articular-cartilage-contact-surface-of-the-knee-during-a-step-up-motion
#16
Peng Yin, Jing-Sheng Li, Willem A Kernkamp, Tsung-Yuan Tsai, Seung-Hoon Baek, Ali Hosseini, Lin Lin, Peifu Tang, Guoan Li
BACKGROUND: Numerous studies have reported on the tibiofemoral articular cartilage contact kinematics, however, no data has been reported on the articular cartilage geometry at the contact area. This study investigated the in-vivo tibiofemoral articular cartilage contact biomechanics during a dynamic step-up motion. METHODS: Ten healthy subjects were imaged using a validated magnetic resonance and dual fluoroscopic imaging technique during a step-up motion. Three-dimensional bone and cartilage models were constructed from the magnetic resonance images...
November 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28893629/obesity-and-type-2-diabetes-not-a-diet-high-in-fat-sucrose-and-cholesterol-negatively-impacts-bone-outcomes-in-the-hyperphagic-otsuka-long-evans-tokushima-fatty-rat
#17
Laura C Ortinau, Melissa A Linden, Rebecca Dirkes, R Scott Rector, Pamela S Hinton
BACKGROUND: Obesity and type 2 diabetes (T2D) increase fracture risk; however, the association between obesity/T2D may be confounded by consumption of a diet high in fat, sucrose, and cholesterol (HFSC). OBJECTIVE: The study objective was to determine the main and interactive effects of obesity/T2D and a HFSC diet on bone outcomes using hyperphagic Otuska Long Evans Tokushima Fatty (OLETF) rats and normophagic Long Evans Tokushima Otsuka (LETO) controls. METHODS: At 8weeks of age, male OLETF and LETO rats were randomized to either a control (CON, 10 en% from fat as soybean oil) or HFSC (45 en% from fat as soybean oil/lard, 17 en% sucrose, and 1wt%) diet, resulting in four treatment groups...
September 9, 2017: Bone
https://www.readbyqxmd.com/read/28884881/effects-of-a-randomized-weight-loss-intervention-trial-in-obese-adolescents-on-tibia-and-radius-bone-geometry-and-volumetric-density
#18
Jennifer C Kelley, Nicolas Stettler-Davis, Mary B Leonard, Douglas Hill, Brian H Wrotniak, Justine Shults, Virginia A Stallings, Robert Berkowitz, Melissa S Xanthopoulos, Elizabeth Prout-Parks, Sarah B Klieger, Babette S Zemel
Obese adolescents have increased fracture risk, but effects of alterations in adiposity on bone accrual and strength in obese adolescents are not understood. We evaluated 12-month changes in trabecular and cortical volumetric bone mineral density (vBMD) and cortical geometry in obese adolescents undergoing a randomized weight management program, and investigated the effect of body composition changes on bone outcomes. Peripheral quantitative CT of the radius and tibia, and whole body DXA scans were obtained at baseline, six and 12 months in 91 obese adolescents randomized to standard care versus behavioral intervention for weight loss...
September 8, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28840427/musculoskeletal-system-in-children-and-adolescents-with-inflammatory-bowel-disease-normal-muscle-force-decreased-trabecular-bone-mineral-density-and-low-prevalence-of-vertebral-fractures
#19
Klara Maratova, Ondrej Hradsky, Jana Matyskova, Ivana Copova, Ondrej Soucek, Zdenek Sumnik, Jiri Bronsky
Low bone mineral density (BMD) and an increased fracture incidence are two extraintestinal complications associated with inflammatory bowel disease (IBD). We aimed to evaluate musculoskeletal traits and assess vertebral fracture (VF) rate in children and adolescents with IBD. Seventy patients with IBD with a median age of 13.8 years were included. The BMD and geometric parameters of the non-dominant tibia were assessed using pQCT. Dynamic muscle functions were evaluated using jumping mechanography. VFs were assessed according to the semiquantitative standardized method by Genant...
October 2017: European Journal of Pediatrics
https://www.readbyqxmd.com/read/28828951/clinical-outcomes-of-patient-specific-porous-titanium-endoprostheses-in-dogs-with-tumors-of-the-mandible-radius-or-tibia-12-cases-2013-2016
#20
Jonathan P Bray, Andrew Kersley, Warwick Downing, Katherine R Crosse, Andrew J Worth, Arthur K House, Guy Yates, Alastair R Coomer, Ian W M Brown
OBJECTIVE To characterize the processes involved in and outcomes achieved with custom-designed patient-specific implants to provide functional replacement of skeletal structures in dogs with tumors of the mandible, radius, or tibia. DESIGN Prospective case series. ANIMALS 6 dogs with mandibular tumors, 5 with tumors of the distal aspect of the radius, and 1 with a tumor in the distal aspect of the tibia treated from June 2013 to September 2016 at 3 referral centers. PROCEDURES After tumor staging, implants were designed from patients' CT scans by means of various computer-aided design applications and printed by means of selective laser melting in titanium-6 aluminum-4 vanadium alloy...
September 1, 2017: Journal of the American Veterinary Medical Association
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