scholarly journals Comparison of Trabecular Bone Mineral Density Measurement Using Hounsfield Unit and Trabecular Microstructure in Orthodontic Patients Using Cone-Beam Computed Tomography

2021 ◽  
Vol 11 (3) ◽  
pp. 1028
Author(s):  
Tae-Hyun Kim ◽  
Dong-Yul Lee ◽  
Seok-Ki Jung
Keyword(s):  
Bone Mineral Density ◽  
Bone Mineral ◽  
Volume Fraction ◽  
Cervical Vertebra ◽  
Hounsfield Unit ◽  
Mineral Density ◽  
Bone Volume Fraction ◽  
Trabecular Thickness ◽  
Trabecular Microstructure ◽  
Trabecular Number

The aim of this study was to measure the bone mineral density of specific regions of maxilla, mandible, and first cervical vertebra using the Hounsfield unit and trabecular microstructure pattern analysis and to compare the two methods. In this study, cone-beam computed tomography (CBCT) images were obtained from 58 patients. Trabecular thickness, trabecular number, trabecular separation, and bone volume fraction were measured in 484 regions for trabecular microstructure parameters and Hounsfield unit was measured for the grayscale value. There was no difference in bone mineral density between the right and left side in every site and between males and females. Trabecular thickness and trabecular number were high in the order of anterior base of the maxilla, mandibular body, first cervical vertebra, and mandibular condyle. Bone volume fraction and Hounsfield unit were high in the order of anterior base of the maxilla, mandibular body, mandibular condyle, and first cervical vertebra (p < 0.05). Trabecular thickness, trabecular number, and bone volume fraction was positively correlated to the Hounsfield unit, and trabecular separation was negatively correlated to the Hounsfield unit (p < 0.005). This study suggests that it is possible to compare the bone mineral density of trabecular bone in various sites using the Hounsfield unit and trabecular microstructure pattern analysis.

scholarly journals Antiosteoporosis Effect ofRadix ScutellariaeExtract on Density and Microstructure of Long Bones in Tail-Suspended Sprague-Dawley Rats

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Chen-Rui Li ◽  
Guang-Wei Zhang ◽  
Yin-Bo Niu ◽  
Ya-Lei Pan ◽  
Yuan-Kun Zhai ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Bone Mineral ◽  
Volume Fraction ◽  
Bone Microarchitecture ◽  
Osteoclast Differentiation ◽  
Hindlimb Unloading ◽  
Mineral Density ◽  
Bone Volume Fraction ◽  
Trabecular Thickness ◽  
Radix Scutellariae

Radix Scutellariae (RS), a medicinal herb, is extensively employed in traditional Chinese medicines and modern herbal prescriptions. Two major flavonoids in RS were known to induce osteoblastic differentiation and inhibit osteoclast differentiation, respectively. This study aimed to investigate the effect ofRadix Scutellariaeextract (RSE) against bone loss induced by mechanical inactivity or weightlessness. A hindlimb unloading tail-suspended rat model (TS) was established to determine the effect of RSE on bone mineral density and bone microarchitecture. Treatment of RSE at 50 mg/kg/day and alendronate (ALE) at 2 mg/kg/day as positive control for 42 days significantly increased the bone mineral density and mechanical strength compared with TS group. Enhanced bone turnover markers by TS treatment were attenuated by RSE and ALE administration. Deterioration of bone trabecula induced by TS was prevented. Moreover, both treatments counteracted the reduction of bone volume fraction, trabecular thickness and number, and connectivity density. In conclusion, RSE was demonstrated for the first time to prevent osteoporosis induced by TS treatment, which suggests the potential application of RSE in the treatment of disuse-induced osteoporosis.

scholarly journals Bone microarchitectural parameters can detect oxytocin induced changes prior to bone density on mitigating bone deterioration in rabbit osteoporosis model using micro-CT

2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Yuyou Qiu ◽  
Cuisong Tang ◽  
Mario Serrano-Sosa ◽  
Jian Hu ◽  
Jingqi Zhu ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Bone Mineral ◽  
Volume Fraction ◽  
Rabbit Model ◽  
Vehicle Group ◽  
Control Group ◽  
Micro Ct ◽  
Mineral Density ◽  
Bone Volume Fraction ◽  
Trabecular Thickness

Abstract Background This study is aimed to determine the efficacy of X-Ray Microtomography (micro-CT) in predicting oxytocin (OT) treatment response in rabbit osteoporosis(OP) model. Methods Sixty-five rabbits were randomly divided into three groups: control group, ovariectomy (OVX) -vehicle and OVX-oxytocin group. The controls underwent sham surgery. OVX-vehicle and OVX-oxytocin groups were subjected to bilateral OVX. The rabbits in OVX-oxytocin group were injected with oxytocin. In the 0th, 4th, 8th, 10th and 12th weeks post OVX operation, bone mineral density (BMD) and bone micro-architectural parameters were measured in three groups. Results Bone mineral density (BMD), bone volume fraction (BV/TV), Trabecular Number (Tb.N), and Trabecular Thickness (Tb.Th) decreased, while Trabecular Spacing (Tb.Sp) and Structure Model Index (SMI) increased overtime in all the three groups. In OVX-oxytocin group, the bone deterioration tendency is slowing down compared with that of the OVX-vehicle group. The BMD of the OVX-oxytocin group was significantly lower than those in the OVX-vehicle group at 12th week (P = 0.017). BV/TV and Tb.Sp in OVX-oxytocin group changed significantly from 8th week (P = 0.043) and 12th week (P = 0.014), which is earlier than that of BMD and other bone micro-architectural parameters. Conclusion BV/TV and Tb.Sp changed prior to BMD and other bone micro-architectural parameters with oxytocin intervention, which indicate that they are more sensitive markers for predicting early osteoporosis and treatment monitoring when using micro-CT to evaluate osteoporosis rabbit model.

scholarly journals Increased Microstructural Variability Is Associated With Decreased Structural Strength but With Increased Measures of Structural Ductility in Human Vertebrae

2009 ◽  
Author(s):  
Janardhan Yerramshetty ◽  
Do-Gyoon Kim ◽  
Yener N. Yeni
Keyword(s):  
Bone Mineral Density ◽  
Bone Mineral ◽  
Volume Fraction ◽  
Structural Parameters ◽  
Average Density ◽  
Mineral Density ◽  
Bone Volume Fraction ◽  
Microstructural Parameters ◽  
Apparent Modulus ◽  
Vertebral Strength

The lack of accuracy in the prediction of vertebral fracture risk from average density measurements, all external factors being equal, may be because bone mineral density (BMD) is less than a perfect surrogate for bone strength but also because strength alone may not be sufficient to fully characterize the structural failure of a vertebra. Apart from bone quantity, organization of micro-architecture would have a role in governing mechanical properties of vertebrae. An earlier study indicated that within-vertebra variability, measured as the coefficient of variation (COV) of bone volume fraction (BV/TV) or as COV of finite element-estimated apparent modulus (EFE) correlated well with vertebral strength [1]. Therefore, as an extension to our earlier study, we investigated i) whether the relationships of vertebral strength found with COV of BV/TV and COV of EFE could be extended to the COV of other micro-structural parameters and microcomputed tomography-estimated bone mineral density (μCT-BMD) and ii) whether COV of microstructural parameters were associated with structural ductility measures.

scholarly journals Effect of Senolytic to alleviating Osteoporosis in Mice induced by Retinoic Acid

2020 ◽  
Vol 185 ◽  
pp. 04016
Author(s):  
Jia Liu ◽  
Yazhe Xiao ◽  
Jing Xie ◽  
Lian He
Keyword(s):  
Bone Mineral Density ◽  
Trabecular Bone ◽  
Bone Mineral ◽  
Volume Fraction ◽  
Bone Volume ◽  
Control Group ◽  
Mineral Density ◽  
Blank Control Group ◽  
Bone Volume Fraction ◽  
Group A

Senolytic is a potential new anti-aging drug, and it is worth exploring whether it has an inhibitory effect on osteoporosis. Osteoporosis models in mice were established by gavage of retinoic acid(RA), and Senolytic drugs (dasatinib and quercetin) were used to treat for 8w. Serological indexes were measured, and bone mineral density was detected by dual-energy X-ray absorptiometry, then parameters of trabecular bone were quantified by μCT, by which three-dimensional images of lumbar trabecular bone were rebuild for comprehensive analysis. In osteoporosis model mice the content of serum calcium and alkaline phosphatase in mice were increased, the bone mineral density decreased, bone volume fraction and trabecular number decreased significantly, and the trabecular separation increased significantly. After applying the Senolytic drug, the serum calcium of group A and B were significantly lower than that of the blank control group. The alkaline phosphatase content in the two groups was (272.5±42.7)U/L and (258.4±90.2)U/L, which was also significantly lower than that in the blank control group (389.0±31.1)U/L. After the treatment of Senolytic, the bone mineral density of group A and group B were improved, the bone volume fraction were increased compared with the blank control group. The trabecular bone separation of the two groups was significantly reduced. Therefore, these reduced osteoporosis. From our study, it can be confirmed that the senolytic drug has a certain alleviating effect on osteoporosis.

scholarly journals Conditional disruption of IGF-I gene in type 1α collagen-expressing cells shows an essential role of IGF-I in skeletal anabolic response to loading

2011 ◽  
Vol 301 (6) ◽  
pp. E1191-E1197 ◽  
Author(s):  
Chandrasekhar Kesavan ◽  
Jon E. Wergedal ◽  
K.-H. William Lau ◽  
Subburaman Mohan
Keyword(s):  
Bone Mineral Density ◽  
Bone Mineral ◽  
Mechanical Strain ◽  
Bone Size ◽  
Size Difference ◽  
Mineral Density ◽  
Trabecular Thickness ◽  
Bone Response ◽  
Igf I ◽  
I Gene

To establish a causal role for locally produced IGF-I in the mechanical strain response in the bone, we have generated mice with conditional disruption of the insulin-like growth factor (IGF) I gene in type 1α2 collagen-expressing cells using the Cre-loxP approach. At 10 wk of age, loads adjusted to account for bone size difference were applied via four-point bending or axial loading (AL) in mice. Two wk of bending and AL produced significant increases in bone mineral density and bone size at the middiaphysis of wild-type (WT), but not knockout (KO), mice. In addition, AL produced an 8–25% increase in trabecular parameters (bone volume-tissue volume ratio, trabecular thickness, and trabecular bone mineral density) at the secondary spongiosa of WT, but not KO, mice. Histomorphometric analysis at the trabecular site revealed that AL increased osteoid width by 60% and decreased tartrate-resistance acidic phosphatase-labeled surface by 50% in the WT, but not KO, mice. Consistent with the in vivo data, blockade of IGF-I action with inhibitory IGF-binding protein (IGFBP4) in vitro completely abolished the fluid flow stress-induced MC3T3-E1 cell proliferation. One-way ANOVA revealed that expression levels of EFNB1, EFNB2, EFNA2, EphB2, and NR4a3 were different in the loaded bones of WT vs. KO mice and may, in part, be responsible for the increase in bone response to loading in the WT mice. In conclusion, IGF-I expressed in type 1 collagen-producing bone cells is critical for converting mechanical signal to anabolic signal in bone, and other growth factors cannot compensate for the loss of local IGF-I.

scholarly journals Extracorporeal Shockwave Therapy Modulates the Expressions of Proinflammatory Cytokines IL33 and IL17A, and Their Receptors ST2 and IL17RA, within the Articular Cartilage in Early Avascular Necrosis of the Femoral Head in a Rat Model

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Jai-Hong Cheng ◽  
Shun-Wun Jhan ◽  
Chieh-Cheng Hsu ◽  
Hung-Wen Chiu ◽  
Shan-Ling Hsu
Keyword(s):  
Articular Cartilage ◽  
Femoral Head ◽  
Avascular Necrosis ◽  
Volume Fraction ◽  
Bone Volume Fraction ◽  
Trabecular Thickness ◽  
Extracorporeal Shockwave Therapy ◽  
Extracorporeal Shockwave ◽  
Shockwave Therapy ◽  
Trabecular Number

Avascular necrosis (AVN) of the femoral head (AVNFH) is a disease caused by injury to the blood supply of the femoral head, resulting in a collapse with osteonecrosis and damage to the articular cartilage. Extracorporeal shockwave therapy (ESWT) has been demonstrated to improve AVNFH owing to its anti-inflammation activity, angiogenesis effect, and tissue regeneration in clinical treatment. However, there are still so many pieces of the jigsaw that need to be fit into place in order to ascertain the mechanism of ESWT for the treatment of AVNFH. The study demonstrated that ESWT significantly protected the trabecular bone volume fraction BV/TV ( P < 0.01 ) and the trabecular thickness ( P < 0.001 ), while in contrast, the trabecular number and trabecular separation were not significantly different after treatment as compared with AVNFH. ESWT protected the articular cartilage in animal model of AVNFH. The levels of IL1-β and IL33 were significantly induced in the AVNFH group ( P < 0.001 ) as compared with Sham and ESWT groups and reduced in ESWT group ( P < 0.001 ) as compared with AVNFH group. In addition, the expression of the receptor of IL33, ST2, was reduced in AVNFH and induced after ESWT ( P < 0.001 ). The expression of IL17A was induced in the AVNFH group ( P < 0.001 ) and reduced in the ESWT group ( P < 0.001 ). Further, the expression of the receptor of IL17A, IL17RA, was reduced in the AVNFH group ( P < 0.001 ) and improved to a normal level in the ESWT group as compared with Sham group ( P < 0.001 ). Taken together, the results of the study indicated that ESWT modulated the expression of IL1-β, pro-inflammatory cytokines IL33 and IL17A, and their receptors ST2 and IL17RA, to protect against loss of the extracellular matrix in the articular cartilage of early AVNFH.

scholarly journals Effects of ginsenoside Rg3 on bone loss, bone mineral density and osteoclast number in glucocorticoid-induced osteoporosis rats, and the likely michanism of action

2020 ◽  
Vol 19 (4) ◽  
pp. 811-815
Author(s):  
Maoxiu Peng ◽  
Gangyl Jiang ◽  
Shaoqi He ◽  
Chengxuan Tang
Keyword(s):  
Bone Mineral Density ◽  
Bone Loss ◽  
Bone Mineral ◽  
Lumbar Vertebrae ◽  
Ginsenoside Rg3 ◽  
Model Group ◽  
Mineral Density ◽  
Alendronate Sodium ◽  
Trabecular Thickness ◽  
Osteoclast Number

Purpose: To investigate the effect of ginsenoside Rg3 on bone loss, bone mineral density (BMD) and osteoclast number in glucocorticoid-induced osteoporosis (GIOP) rats, and the mechanism of action involved.Methods: Sixty female Wistar rats were assigned to control, model group, ginsenoside Rg3, and alendronate sodium groups, comprised of 15 rats per group. The osteoporosis rat model was established via intramuscular injection of dexamethasone. Changes in bone mineral content (BMC), BMD trabecular thickness and area, osteoblasts and osteoclasts in femurs and lumbar vertebrae were measured after 3 months of treatment.Results: There were significantly higher BMC and BMD levels in ginsenoside Rg3 group than in alendronate rats (p < 0.05). The thickness and  trabecular area in femur and lumbar vertebrae in the ginsenoside Rg3 group were significantly higher than those in the model group (p < 0.05), but were comparable with those in the alendronate sodium group (p > 0.05). There were marked increases in osteoblasts, and marked decreases in osteoclasts in the ginsenoside Rg3 group, alendronate sodium and control rats, relative to model rats (p < 0.05).Conclusion: Ginsenoside Rg3 arrests bone loss, and enhances bone density, trabecular thickness and area, bone microstructure, osteoblast activity and population of osteoclasts number in glucocorticoidinduced osteoporotic rats. This provides a new research direction for the clinical treatment ofosteoporosis. Keywords: Ginseng soap, Rg3, Glucocorticoid, Osteoporosis, Bone loss, Bone mineral density, Osteoclast population

Trabecular Bone Structures in the Edentulous Diastema of Osteoporotic Sheep

2008 ◽  
Vol 87 (9) ◽  
pp. 866-870 ◽  
Author(s):  
G. Dvorak ◽  
R. Gruber ◽  
C.D. Huber ◽  
J. Goldhahn ◽  
G. Zanoni ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Trabecular Bone ◽  
Bone Mineral ◽  
Structural Parameters ◽  
Mineral Density ◽  
Trabecular Bone Mineral Density ◽  
Trabecular Microstructure ◽  
Embryonic Origin ◽  
Bone Structures ◽  
Maxillary Region

The edentulous ovine diastema represents a suitable region for implantological research. Due to distinctive embryonic origin and mechanical loading, the edentulous diastema may respond differently to osteoporosis than tooth-bearing areas. To test this assumption, we subjected geriatric sheep to ovariectomy, calcium-/vitamin-D-restricted diet, and methylprednisolone administration. Adult control sheep remained untreated. Structural parameters and bone mineral density were determined by microcomputed tomography and conventional computed tomography, respectively. We report that the trabecular microstructure in the diastema was preserved from catabolic changes. In contrast, the premolar maxillary region of osteoporotic sheep had diminished trabecular bone mineral density, with the corresponding structural deteriorations. These results suggest that maxillary trabecular bone of the edentulous diastema does not respond to catabolic changes which occur in the tooth-bearing area in osteoporosis. Our findings imply that regional anatomic domains must be considered in the planning of pre-clinical studies, taking osteoporotic changes into account.

scholarly journals Use of computed tomography for assessing bone mineral density

2014 ◽  
Vol 37 (1) ◽  
pp. E4 ◽  
Author(s):  
Joseph J. Schreiber ◽  
Paul A. Anderson ◽  
Wellington K. Hsu
Keyword(s):  
Computed Tomography ◽  
Bone Mineral Density ◽  
Bone Quality ◽  
Bone Mineral ◽  
Normative Data ◽  
Hounsfield Unit ◽  
Ct Scans ◽  
Implant Stability ◽  
Mineral Density ◽  
Local Bone

Assessing local bone quality on CT scans with Hounsfield unit (HU) quantification is being used with increasing frequency. Correlations between HU and bone mineral density have been established, and normative data have been defined throughout the spine. Recent investigations have explored the utility of HU values in assessing fracture risk, implant stability, and spinal fusion success. The information provided by a simple HU measurement can alert the treating physician to decreased bone quality, which can be useful in both medically and surgically managing these patients.

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