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Tibia geometry

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https://www.readbyqxmd.com/read/28710591/effect-of-dietary-phytase-supplementation-on-bone-and-hyaline-cartilage-development-of-broilers-fed-with-organically-complexed-copper-in-a-cu-deficient-diet
#1
Siemowit Muszyński, Ewa Tomaszewska, Małgorzata Kwiecień, Piotr Dobrowolski, Agnieszka Tomczyk
Tibial mechanical, chemical, and histomorphometrical traits were investigated for growing male Ross 308 broiler chickens fed diets that had copper (Cu) from organic source at a lowered level of 25% of the daily requirement (4 mg kg(-1) of a premix) with or without phytase. Dietary treatments were control non-copper, non-phytase group (0 Suppl); 4 mg kg(-1) Cu non-phytase group (25%Cu); and 4 mg kg(-1) Cu + 500 FTU kg(-1) phytase group (25%Cu + phyt). The results show that birds fed with the addition of phytase exhibited improved weight gain and final body weight and had increased serum IGF-1 and osteocalcin concentrations...
July 15, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28708778/radiographic-investigation-of-the-distal-extension-of-fractures-into-the-articular-surface-of-the-tibia-the-ridefast-study
#2
Lucas S Marchand, Ajinkya A Rane, Zachary M Working, Lance G Jacobson, Erik N Kubiak, Thomas F Higgins, David L Rothberg
OBJECTIVE: To determine whether radiographic measurements are predictive of involvement of the distal tibia articular surface in tibial shaft fractures. DESIGN: Retrospective review. SETTING: Academic level-I trauma hospital. PATIENTS: Two-hundred seventeen patients with tibial shaft fractures distal to the isthmus (AO/OTA: 42-A1-3;42-B1-3;42-C1-3;43-A1-3). INTERVENTION: Analysis of AP and lateral radiographs...
June 22, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28675940/influence-of-geometry-and-depth-of-resections-on-bone-support-for-total-ankle-replacement
#3
Jeffrey E Bischoff, Lew Schon, Charles Saltzman
BACKGROUND: Aseptic component loosening is a leading cause of revision for total ankle replacement. Different operative approaches for resecting the tibia and talus impact the bony support for the prostheses due to variations in both bone density and resection area, and may therefore impact loosening performance. METHODS: Computed tomography data from 116 subjects were obtained, and solid models of the talus and tibia were generated. Bone density, resection area, and bony support were measured on a series of flat resections for each subject, at multiple resection depths...
July 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28656456/modifications-of-femoral-component-design-in-multi-radius-total-knee-arthroplasty-lead-to-higher-lateral-posterior-femoro-tibial-translation
#4
Tilman Pfitzner, Philippe Moewis, Patrick Stein, Heide Boeth, Adam Trepczynski, Philipp von Roth, Georg N Duda
PURPOSE: As the aims of changes in total knee arthroplasty (TKA) designs are to reinstate more natural kinematics, the current study evaluated the in vivo kinematics in patients who underwent a cruciate retaining gradually changing femoral radius ("G-CURVE") against a cruciate retaining conventional changing femoral radius ("J-CURVE") geometry TKA design. The hypothesis of the study is that the G-CURVE design would allow a substantial increase in the femoral rollback compared to the J-CURVE design...
June 27, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28623079/restoration-of-articular-geometry-using-current-graft-options-for-large-glenoid-bone-defects-in-anterior-shoulder-instability
#5
Laurent B Willemot, Mohsen Akbari-Shandiz, Joaquin Sanchez-Sotelo, Kristin Zhao, Olivier Verborgt
PURPOSE: The purpose of this cadaveric study was to compare standard and modified coracoid transfer procedures, bicortical and tricortical iliac crest autografts, and tibial plafond and glenoid allografts with respect to glenoid surface curvature restoration. METHODS: Computed tomography scans of 8 cadaveric shoulders were acquired in 9 conditions: (1) intact, (2) 25% width defect, (3) classic Latarjet, (4) modified congruent-arc Latarjet, (5) tricortical iliac crest inner table, (6) outer table, (7) bicortical iliac crest, (8) distal tibia, and (9) glenoid allograft...
June 13, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28474432/associations-of-muscle-force-power-cross-sectional-muscle-area-and-bone-geometry-in-older-uk-men
#6
Ayse Zengin, Stephen R Pye, Michael J Cook, Judith E Adams, Rainer Rawer, Frederick C W Wu, Terence W O'Neill, Kate A Ward
BACKGROUND: Ageing is associated with sarcopenia, osteoporosis, and increased fall risk, all of which contribute to increased fracture risk. Mechanically, bone strength adapts in response to forces created by muscle contractions. Adaptations can be through changes in bone size, geometry, and bending strength. Muscle mass is often used as a surrogate for muscle force; however, force can be increased without changes in muscle mass. Increased fall risk with ageing has been associated with a decline in muscle power-which is a measure of mobility...
May 4, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28472303/the-effect-of-whole-body-vibration-training-on-bone-and-muscle-function-in-children-with-osteogenesis-imperfecta
#7
Wolfgang Högler, Janis Scott, Nick Bishop, Paul Arundel, Peter Nightingale, M Zulf Mughal, Raja Padidela, Nick Shaw, Nicola Crabtree
Context: Osteogenesis imperfecta (OI) is a bone fragility disorder associated with reduced muscle size, dynamic muscle function and mobility. Objective: To assess the effect of whole body vibration (WBV) training on bone density and geometry, muscle size and function, mobility, and balance in children with OI. Design: Randomised controlled pilot trial. Setting: Tertiary paediatric research centre. Participants: Twenty-four children (5-16 years) with OI types 1,4 and limited mobility (CHAQ score ≥0...
May 3, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28471817/effects-of-tibial-rotational-guided-growth-on-the-geometries-of-tibial-plateaus-and-menisci-in-rabbits
#8
Figen Sevil-Kilimci, Mutlu Cobanoglu, Mehmet K Ocal, Deniz Korkmaz, Emre Cullu
BACKGROUND: There are studies on the use of oblique plate over epiphyses for rotational deformities but the effects of this method on bone are not yet known. The purpose of this study was to determine the effect and rebound effect of rotational-guided growth on the geometries of the tibial plateaus and menisci in a rabbit model of tibial axial rotation. METHODS: Thirty male rabbits were 6 weeks old when medial and lateral plates were applied to the proximal tibias of the left side...
May 3, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28454908/accuracy-of-mobile-biplane-x-ray-imaging-in-measuring-6-degree-of-freedom-patellofemoral-kinematics-during-overground-gait
#9
Hans A Gray, Shanyuanye Guan, Marcus G Pandy
The aim of this study was to evaluate the accuracy with which mobile biplane X-ray imaging can be used to measure patellofemoral kinematics of the intact knee during overground gait. A unique mobile X-ray imaging system tracked and recorded biplane fluoroscopic images of two human cadaver knees during simulated overground walking at a speed of 0.7m/s. Six-degree-of-freedom patellofemoral kinematics were calculated using a bone volumetric model-based method and the results then compared against those derived from a gold-standard bead-based method...
April 19, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28439468/a-link-between-central-kynurenine-metabolism-and-bone-strength-in-rats-with-chronic-kidney-disease
#10
Bartlomiej Kalaska, Krystyna Pawlak, Ewa Oksztulska-Kolanek, Tomasz Domaniewski, Beata Znorko, Malgorzata Karbowska, Aleksandra Citkowska, Joanna Rogalska, Alicja Roszczenko, Malgorzata M Brzoska, Dariusz Pawlak
BACKGROUND: Disturbances in mineral and bone metabolism represent one of the most complex complications of chronic kidney disease (CKD). Serotonin, a monoamine synthesized from tryptophan, may play a potential role in bone metabolism. Brain-derived serotonin exerts a positive effect on the bone structure by limiting bone resorption and enhancing bone formation. Tryptophan is the precursor not only to the serotonin but also and primarily to kynurenine metabolites. The ultimate aim of the present study was to determine the association between central kynurenine metabolism and biomechanical as well as geometrical properties of bone in the experimental model of the early stage of CKD...
2017: PeerJ
https://www.readbyqxmd.com/read/28421261/-positive-and-negative-predictors-of-long-term-results-after-an-osteotomy-around-the-knee-joint
#11
S Hinterwimmer
A frequently asked question in the context of any surgical procedure, including an osteotomy around the knee joint, is "which parameters are in favor of a therapeutic success in this special case?" If the analysis of the leg geometry is in favor of an osteotomy, then the patient must be assessed further, taking into account the joint status and patient's condition. Positive outcome predictors for long-term success of an osteotomy around the knee, especially for a valgus osteotomy at the tibia are a tibial bone varus angle (TBVA) > 3-5°, knee joint range of motion > 100° flexion, male sex, and a BMI < 30...
April 18, 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28384358/similarities-in-trabecular-hypertrophy-with-site-specific-differences-in-cortical-morphology-between-men-and-women-with-type-2-diabetes-mellitus
#12
Janina M Patsch, Sazan Rasul, Florian A Huber, Karoline Leitner, Anita Thomas, Roland Kocijan, Stephanie Boutroy, Michael Weber, Heinrich Resch, Franz Kainberger, Claudia Schüller-Weidekamm, Alexandra Kautzky-Willer
The goal of our study was to investigate interactions between sex and type 2 diabetes mellitus (T2DM) with regard to morphology of the peripheral skeleton. We recruited 85 subjects (mean age, 57±11.4 years): women with and without T2DM (n = 17; n = 16); and men with and without T2DM (n = 26; n = 26). All patients underwent high-resolution, peripheral, quantitative, computed tomography (HR-pQCT) imaging of the ultradistal radius (UR) and tibia (UT). Local bone geometry, bone mineral density (BMD), and bone microarchitecture were obtained by quantitative analysis of HR-pQCT images...
2017: PloS One
https://www.readbyqxmd.com/read/28371842/correlation-analysis-of-cortical-geometry-of-tibia-and-humerus-of-white-leghorns-using-clinical-quantitative-computed-tomography-and-microcomputed-tomography-scans1
#13
P Regmi, A G Cox, C I Robison, D M Karcher
Peripheral quantitative computed tomography (QCT) has been used in poultry bone research in recent years to analyze cortical and cross-sectional geometry. For QCT to be used as a standard research tool for analysis of bones of laying hens (cortical thickness <2 mm), the accuracy of the scans must be assessed. The primary difference between the QCT and micro-computed tomography (micro-CT) is image resolution. Image resolution is inversely related to the pixel size. The aim of the current study was to correlate the cortical parameters measured using clinical CT scans with the measurements from micro-CT, the current gold standard...
March 24, 2017: Poultry Science
https://www.readbyqxmd.com/read/28341899/cortical-microstructure-compensates-for-smaller-bone-size-in-young-caribbean-hispanic-versus-non-hispanic-white-men
#14
M D Walker, A Kepley, K Nishiyama, B Zhou, E Guo, T L Nickolas
Hispanic men have smaller bone size but thicker and denser cortices compared to white men, leading to similar mechanical competence. INTRODUCTION: The purpose of this study was to assess differences in vBMD and microarchitecture in young Caribbean Hispanic (n = 30) and non-Hispanic Caucasian (n = 30) men. METHODS: We measured areal bone mineral density (aBMD) at the spine, total hip (TH), femoral neck (FN), and forearm by dual-energy X-ray absorptiometry (DXA) and bone geometry, mass, microarchitecture, and mechanical competence by high-resolution peripheral quantitative computed tomography (HRpQCT), individual trabecula segmentation (ITS), and finite element analysis (FEA)...
March 24, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28326606/physical-activity-sedentary-time-and-bone-strength-from-childhood-to-early-adulthood-a-mixed-longitudinal-hr-pqct-study
#15
Leigh Gabel, Heather M Macdonald, Lindsay Nettlefold, Heather A McKay
Bone strength is influenced by bone geometry, density, and bone microarchitecture, which adapt to increased mechanical loads during growth. Physical activity (PA) is essential for optimal bone strength accrual; however, less is known about how sedentary time influences bone strength and its determinants. Thus, our aim was to investigate the prospective associations between PA, sedentary time, and bone strength and its determinants during adolescence. We used HR-pQCT at distal tibia (8% site) and radius (7% site) in 173 girls and 136 boys (aged 9 to 20 years at baseline)...
July 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28323146/hypogonadal-men-with-type-2-diabetes-mellitus-have-smaller-bone-size-and-lower-bone-turnover
#16
Georgia Colleluori, Lina Aguirre, Richard Dorin, David Robbins, Dean Blevins, Yoann Barnouin, Rui Chen, Clifford Qualls, Dennis T Villareal, Reina Armamento-Villareal
INTRODUCTION: Both hypogonadism and type 2 diabetes mellitus (T2D) are associated with increased fracture risk. Emerging data support the negative effect of low testosterone on glucose metabolism, however, there is little information on the bone health of hypogonadal men with diabetes. We evaluated the bone mineral density (BMD), bone geometry and bone turnover of hypogonadal men with T2D compared to hypogonadal men without diabetes. MATERIALS AND METHODS: Cross-sectional study, men 40-74years old, with average morning testosterone (done twice) of<300ng/dl...
March 16, 2017: Bone
https://www.readbyqxmd.com/read/28256308/precision-of-second-generation-high-resolution-peripheral-quantitative-computed-tomography-intra-and-intertester-reproducibilities-and-factors-involved-in-the-reproducibility-of-cortical-porosity
#17
Ko Chiba, Narihiro Okazaki, Ayako Kurogi, Yusaku Isobe, Akihiko Yonekura, Masato Tomita, Makoto Osaki
High-resolution peripheral quantitative computed tomography (HR-pQCT) was upgraded to a second generation in 2014 with higher spatial resolution, faster scan time, and a different measurement algorithm. The purpose of this study was to investigate the precision of the second-generation HR-pQCT. The distal radius and tibia of 15 healthy men and women (age range of 20-74 yr, 8 men and 7 women) were scanned by second-generation HR-pQCT, and their geometry, bone mineral density (BMD), and the microstructure of trabecular and cortical bones were evaluated...
February 27, 2017: Journal of Clinical Densitometry
https://www.readbyqxmd.com/read/28255659/an-intact-fibula-may-contribute-to-allow-early-weight-bearing-in-surgically-treated-tibial-plateau-fractures
#18
Ion Carrera, Pablo Eduardo Gelber, Gaetan Chary, Mireia Gomez Masdeu, Miguel A González Ballester, Juan Carlos Monllau, Jerome Noailly
PURPOSE: The role of the proximal tibiofibular joint (PTFJ) in tibial plateau fractures is unknown. The purpose of this study was to assess, with finite-element (FE) calculations, differences in interfragmentary movement (IFM) in a split fracture of lateral tibial plateau, with and without intact fibula. It was hypothesized that an intact fibula could positively contribute to the mechanical stabilization of surgically reduced lateral tibial plateau fractures. METHODS: A split fracture of the lateral tibial plateau was recreated in an FE model of a human tibia...
March 3, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28250247/long-term-wheel-running-can-prevent-deterioration-of-bone-properties-in-diabetes-mellitus-model-rats
#19
A Minematsu, T Hanaoka, D Takeshita, Y Takada, S Okuda, H Imagita, S Sakata
OBJECTIVES: The purpose of this study was to examine the effects of long-term wheel-running on tibia bone properties in T2DM Otsuka Long-Evans Tokushima Fatty (OLETF) rats. METHODS: Ten five-week-old male OLETF rats were used as experimental animals and 5 Long-Evans Tokushima Otsuka (LETO) rats as controls. Half of OLETF rats performed daily voluntary wheel-running for 17 months (OLETF-EXE), while neither the remainder of OLETF nor LETO rats had exercise. At the end of experiment, in addition to serum biochemical and bone formation/resorption marker analyses, bone mass, trabecular bone microarchitecture and cortical bone geometry were analyzed in left tibia, and bone mechanical strength of right tibia was measured...
March 1, 2017: Journal of Musculoskeletal & Neuronal Interactions
https://www.readbyqxmd.com/read/28224178/the-role-of-body-weight-on-bone-in-anorexia-nervosa-a-hr-pqct-study
#20
Jacob Frølich, Stinus Hansen, Laura Al-Dakhiel Winkler, Andreas K Andresen, Anne Pernille Hermann, René K Støving
Anorexia nervosa (AN) is associated with decreased bone mineral density and increased risk of fracture. The aim of this study was to assess bone geometry, volumetric bone mineral density (vBMD), trabecular microarchitecture and estimated failure load in weight-bearing vs. non-weight-bearing bones in AN. We included twenty-five females with AN, and twenty-five female controls matched on age and height. Bone geometry, vBMD and trabecular microarchitecture were assessed using high-resolution peripheral quantitative computed tomography of the distal radius and tibia...
July 2017: Calcified Tissue International
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