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1.
Int J Immunogenet ; 51(3): 157-163, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38441233

RESUMEN

Genome-wide association study identified common variants within the ALDH1A2 gene as the susceptible loci of hand osteoarthritis (HOA) in UK and Iceland populations. Located in chromosome 15, ALDH1A2 encodes aldehyde dehydrogenase family 1 member A2, which is an enzyme that catalyses the synthesis of retinoic acid from retinaldehyde. Our purposes were to replicate the association of functional variant in ALDH1A2 with the development of HOA in the Chinese population. Variant rs12915901 of ALDH1A2 was genotyped in 872 HOA patients and 1223 healthy controls. Subchondral bone samples were collected from 40 patients who had undergone a trapeziectomy, and the tissue expression of ALDH1A2 was analysed. The chi-square analysis was used to compare the frequency of genotype and risk allele between the HOA cases and controls. The Student t test was used to compare the mRNA expression of ALDH1A2 between patients with genotype AA/AG and those with genotype GG. The frequency of genotype AA was significantly higher in HOA patients than in the controls (7.6% vs. 5.1%, p = .01). The frequency of allele A was significantly higher in the patients than in the controls (28.9% vs. 24.6%, p = .005). The mRNA expression of ALDH1A2 was 1.31-folds higher in patients with genotype GG than in the patients with genotype AA/AG (0.000617 ± 0.000231 vs. 0.000471 ± 0.000198, p = .04). Variant rs12915901 of ALDH1A2 contributed to the susceptibility of HOA in the Chinese population. Allele A of rs12915901 can add to the risk of HOA possibly via down-regulation of ALDH1A2 expression.


Asunto(s)
Familia de Aldehído Deshidrogenasa 1 , Pueblo Asiatico , Predisposición Genética a la Enfermedad , Genotipo , Osteoartritis , Polimorfismo de Nucleótido Simple , Adulto , Anciano , Femenino , Humanos , Masculino , Persona de Mediana Edad , Familia de Aldehído Deshidrogenasa 1/genética , Alelos , Pueblo Asiatico/genética , Estudios de Casos y Controles , China , Pueblos del Este de Asia , Frecuencia de los Genes , Estudio de Asociación del Genoma Completo , Mano/patología , Osteoartritis/genética , Osteoartritis/patología
2.
Int Orthop ; 47(6): 1601-1608, 2023 06.
Artículo en Inglés | MEDLINE | ID: mdl-36991283

RESUMEN

PURPOSE: To compare the merits and demerits of percutaneous robot-assisted screw fixation for nondisplaced pelvic fractures with other treatments via long-term follow-up. METHODS: This was a retrospective analysis of nondisplaced pelvic fractures treated between January 2015 and December 2021. The number of fluoroscopy exposures, operative duration, intraoperative blood loss, surgical complications, screw placement accuracy and Majeed score were compared among the nonoperative group (24 cases), open reduction and internal fixation (ORIF) group (45 cases), free-hand empirical screw fixation (FH) group (10 cases) and robot-assisted screw fixation (RA) group (40 cases). RESULTS: There was less intraoperative blood loss in the RA and FH groups than in the ORIF group. The number of fluoroscopy exposures in the RA group was lower than that in the FH group but much higher than that in the ORIF group. There were five cases of wound infection in the ORIF group and no surgical complications in the FH or RA group. The medical expenses were higher in the RA group than in the FH group, with no significant difference from the ORIF group. The Majeed score was lowest in the nonoperative group three months after injury (64.5±12.0) but lowest in the ORIF group one year after injury (88.6±4.1). CONCLUSION: Percutaneous RA for nondisplaced pelvic fractures is effective and minimally invasive and does not increase medical expenses compared with ORIF. Therefore, it is the best choice for patients with nondisplaced pelvic fractures.


Asunto(s)
Fracturas Óseas , Huesos Pélvicos , Robótica , Humanos , Fijación Interna de Fracturas/efectos adversos , Pérdida de Sangre Quirúrgica , Estudios Retrospectivos , Resultado del Tratamiento , Fracturas Óseas/cirugía , Tornillos Óseos , Huesos Pélvicos/cirugía , Huesos Pélvicos/lesiones
3.
Int Orthop ; 47(3): 839-845, 2023 03.
Artículo en Inglés | MEDLINE | ID: mdl-35922521

RESUMEN

PURPOSE: The purpose of this study was to assess the efficiency, safety, and accuracy of cannulated screw fixation using a robot-assisted method compared with a traditional percutaneous freehand method. METHODS: This retrospective clinical study included 18 patients with scaphoid fracture who underwent cannulated screw fixation by robot-assisted technique or traditional percutaneous freehand technique from June 2018 to June 2020. All patients were divided into the robot-assisted group (9 patients) or the traditional surgery group (9 patients). The operation time, blood loss, number of intra-operative fluoroscopies, fracture healing time, Mayo wrist function score, and screw implantation accuracy were recorded in the two groups. RESULTS: The average age of the robot-assisted group was 37.9 ± 10.6 years (with a range of 30 to 52 years), there were eight males and one female, and there were six cases of scaphoid fracture on the right side and three on the left side. The average pre-operative time was 2.8 ± 0.7 days (ranging from 1 to 3 days). The average age of the traditional surgery group was 31.6 ± 6.8 years (with a range of 20 to 45 years), there were eight males and one female, and there were five cases of scaphoid fracture on the right side and four on the left side. The average pre-operative time was 2.1 ± 0.8 days (with a range of 2 to 4 days). The number of intra-operative fluoroscopies was 24.4 ± 3.5 in the traditional surgery group, whereas it was only 10.1 ± 1.9 in the robot-assisted group, which was significantly lower (P < 0.05). The average operation time of the traditional operation group was 48.4 ± 12.2 min, and that of the robot-assisted group was 32.6 ± 4.2 minutes, which was significantly shorter (P < 0.05). The angles between the actual screw position and the central axis of the scaphoid on both the coronal and sagittal post-operative CT images were 8.3° ± 2.3° and 8.8° ± 1.6° for the traditional operation group and 3.8° ± 0.8° and 4.3° ± 1.2° for the robot-assisted group, so the accuracy of the robot-assisted group was significantly higher (P < 0.05). There were no significant differences between the two groups in wrist function recovery or fracture healing time. CONCLUSION: Robot-assisted treatment of scaphoid fracture is more accurate than traditional freehand technology, with shorter operation time and fewer intra-operative fluoroscopies. There is no difference between the two surgical techniques in intra-operative bleeding, post-operative fracture healing, or functional recovery. Robot-assisted surgery is a safe, effective, and accurate method for treating scaphoid fracture.


Asunto(s)
Fracturas Óseas , Traumatismos de la Mano , Robótica , Hueso Escafoides , Traumatismos de la Muñeca , Masculino , Humanos , Femenino , Adulto , Persona de Mediana Edad , Adulto Joven , Fracturas Óseas/cirugía , Estudios Retrospectivos , Fijación Interna de Fracturas/efectos adversos , Fijación Interna de Fracturas/métodos , Resultado del Tratamiento , Hueso Escafoides/cirugía , Hueso Escafoides/lesiones
4.
J Bioenerg Biomembr ; 53(1): 97-107, 2021 02.
Artículo en Inglés | MEDLINE | ID: mdl-33394311

RESUMEN

Emerging evidence suggests that dysregulated circular RNAs (circRNAs) play a pivotal role in osteoarthritis (OA). Circ_0045714 is a functional circRNAs, and has been revealed to involve in the process of OA. However, the molecular mechanisms by which circ_0045714 regulates OA progression are not thoroughly elucidated. Circ_0045714 expression was decreased in OA and TNF-α-induced chondrocytes, ectopic overexpression of circ_0045714 abolished TNF-α-induced cell apoptosis, inflammation, extracellular matrix (ECM) degradation promotion and proliferation inhibition. In a mechanical study, circ_0045714 targeted miR-218-5p, and miR-218-5p overexpression reversed the effects of circ_0045714 on TNF-α-induced chondrocytes. Besides that, HRAS was a target of miR-218-5p, and HRAS knockdown attenuated the protective effects of miR-218-5p inhibition on TNF-α-induced chondrocyte dysfunction. Additionally, circ_0045714 could regulate HRAS expression via miR-218-5p in chondrocytes. Up-regulation of circ_0045714 suppressed TNF-α-induced chondrocyte growth inhibition, inflammation, and ECM degradation via miR-218-5p/HRAS axis, suggesting a novel insight into the pathogenesis of OA and the potential protective role of circ_0045714 in the occurrence and development of OA.


Asunto(s)
Condrocitos/efectos de los fármacos , Matriz Extracelular/metabolismo , MicroARNs/metabolismo , ARN Circular/uso terapéutico , Factor de Necrosis Tumoral alfa/metabolismo , Células Cultivadas , Humanos , ARN Circular/farmacología , Transfección
5.
Clin Lab ; 67(5)2021 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-33978382

RESUMEN

BACKGROUND: MicroRNAs were reported to be involved in the progression of intervertebral disc degeneration (IDD). This study focused on the potential prognostic value and the underlying mechanism of miR-182 in IDD. METHODS: The expression level of miR-182 in plasma samples from 60 IDD patients and 60 healthy controls were examined in the present study. Then, the relationship between miR-182 expression and clinical features of IDD patients was analyzed. Moreover, the nucleus pulposus (NP) cells were cultured and transfected with either miR-182 inhibitor, mimics, or NC to explore the effects of miR-182 on cell proliferation and apoptosis. Furthermore, expression levels of proliferation and apoptosis-related proteins Bcl-2, Bax, and Caspase-3 were also evaluated. RESULTS: The expression level of miR-182 was dramatically increased in plasma samples of IDD patients compared with the controls. Moreover, ROC analysis indicated that miR-182 was a feasible diagnostic indicator for the diagnosis of IDD. According to the Japanese Orthopaedic Association (JOA) score, the prognosis of patients with the lower expression levels of miR-182 was better than for those with the higher expression levels of miR-182 in IDD. Furthermore, the miR-182 inhibitor significantly increased the proliferation, decreased the apoptosis of human NP cells, and altered the expression of proliferation and apoptosis-related proteins Bcl-2, Bax, and Caspase-3. On the contrary, miR-182 mimics notably inhibited proliferation but promoted apoptosis of human NP cells and increased Bax and Caspase-3 expressions while reducing the Bcl-2 level. CONCLUSIONS: miR-182 was negatively correlated with the prognosis of the IDD patients and affected the proliferation and apoptosis of NP cells in vitro.


Asunto(s)
Degeneración del Disco Intervertebral , MicroARNs , Núcleo Pulposo , Apoptosis , Proliferación Celular , Humanos , Degeneración del Disco Intervertebral/diagnóstico , Degeneración del Disco Intervertebral/genética , MicroARNs/genética , Pronóstico
6.
Neoplasma ; 68(4): 798-809, 2021 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-34348465

RESUMEN

Osteosarcoma (OS) is a lethal bone malignancy. Circular RNAs (circRNAs) have emerged as important regulators of OS development. CircRNA cyclin dependent kinase 14 (circ_CDK14) was reported to be a potential oncogene in OS. However, the mechanistic pathway by which circ_CDK14 functions in OS is largely unknown. The relative expression of circ_CDK14, microRNA (miR)-520a-3p, and GRB2 Associated Binding Protein 1 (GAB1) was evaluated by quantitative real-time PCR and western blot assays. Flow cytometry was employed to monitor cell cycle distribution and apoptosis. Methyl thiazolyl tetrazolium (MTT) and colony formation assays were performed to assess cell viability and colony formation ability, respectively. Western blot assay was also used to detect the expression of apoptosis-related proteins. Transwell assay was carried out to monitor cell migration and invasion. Additionally, the target association between miR-520a-3p and circ_CDK14 or GAB1 was confirmed by a dual-luciferase reporter assay. Xenograft assay was applied to investigate the role of circ_CDK14 in vivo. Circ_CDK14 and GAB1 expression was upregulated, while miR-520a-3p was downregulated in OS tissues and cells. Circ_CDK14 depletion hindered OS cell proliferation, metastasis, and tumorigenesis while facilitated apoptosis, which were all ameliorated by miR-520a-3p inhibition. Circ_CDK14 could sponge miR-520a-3p. miR-520a-3p targeted GAB1 to repress OS cell proliferation and metastasis. Circ_CDK14 knockdown blocked OS tumor growth in vivo. Circ_CDK14 might positively affect OS development by modulating the miR-520a-3p/GAB1 axis.


Asunto(s)
MicroARNs , Osteosarcoma , Proteínas Adaptadoras Transductoras de Señales/genética , Línea Celular Tumoral , Quinasas Ciclina-Dependientes , Regulación Neoplásica de la Expresión Génica , Humanos , MicroARNs/genética , Osteosarcoma/genética , ARN Circular
7.
BMC Public Health ; 20(1): 1491, 2020 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-33004017

RESUMEN

BACKGROUND: Knee osteoarthritis (OA) is a common disease condition associated with aging and a frequent cause of primary care consultations. Few longitudinal studies have been conducted to investigate the incidence of symptomatic knee osteoarthritis (OA) and to identify its risk factors among the Chinese population. METHODS: The China Health and Retirement Longitudinal Study (CHARLS) is a nationwide longitudinal survey of persons aged ≥45 years. Symptomatic knee OA was diagnosed when both self-reported knee pain and self-reported physician-diagnosis arthritis existed. Using the national survey data collected from the CHARLS, we estimated the incidence of symptomatic knee OA, taking into account the complex survey design and response rate. We applied weighted logistic regression analysis to identify its risk factors. RESULTS: In the 4-year follow-up, the cumulative incidence of symptomatic knee OA among middle-aged and older Chinese adults was 8.5%; the incidence was higher among females (11.2%) than males (5.6%). Female (odds ratio (OR) 1.98 [95% confidence interval (CI) 1.65-2.37]), rural area (OR 1.32 [95% CI 1.08-1.60]), and West region (OR 2.33 [95% CI 1.89-2.87]) were associated with a higher risk of incident symptomatic knee OA. Physical activities (OR 0.47 [95% CI 0.29-0.76]) and high education level (OR 0.60 [95% CI 0.41-0.88]) was associated with a lower risk of incident symptomatic knee OA, while histories of heart disease (OR 1.40 [95% CI 1.07-1.82]), kidney disease (OR 1.80 [95% CI 1.35-2.39]), and digestive disease (OR 1.54 [95% CI 1.30-1.82]) were associated with a higher risk of incident symptomatic knee OA. CONCLUSION: The cumulative incidence of symptomatic knee OA over 4 years was relatively high, and varied by province and region. Lack of physical activities was confirmed to be risk factors of incident symptomatic knee OA. The presence of heart disease, kidney disease, and digestive disease may be associated with a higher risk of incident symptomatic knee OA, further research need to confirm these findings.


Asunto(s)
Osteoartritis de la Rodilla , Adulto , Anciano , China/epidemiología , Femenino , Humanos , Incidencia , Estudios Longitudinales , Masculino , Persona de Mediana Edad , Osteoartritis de la Rodilla/epidemiología , Osteoartritis de la Rodilla/etiología , Factores de Riesgo
8.
J Acoust Soc Am ; 146(2): EL129, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31472527

RESUMEN

An anisotropic physical model is constructed to evaluate the anisotropy measurement. The model consists of a series of equally spaced thin limestone slab sheets cemented with concrete, resulting in a transversely isotropic medium. For the anisotropy measurement evaluation, the borehole model is tested by a standard multipole acoustic tool. The measurement finds an S-wave anisotropy magnitude about 20% and determines the fast S-wave polarization along the alignment direction of the slab sheets. The results of the work not only validate the borehole measurement technology, but also provide a testing facility for calibrating the measurement acoustic tool.

9.
Adv Exp Med Biol ; 1072: 281-285, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30178359

RESUMEN

Luongo et al. found that the mitochondrial Na+/Ca2+ exchanger (NCLX) was essential for Ca2+ homeostasis and viability. Here, we re-analyze their data in terms of fractal self-similarity and quantitative difference (QD). We calculated the 7-dimension data from NCLX conditional loss-of-function mouse models, and the 9-dimension data from NCLX overexpression (NCLX-Tg) models. RESULTS: The 9-dimension data of the NCLX-Tg and its tTA control were partially self-similar to each other, while the 7-dimension data in NCLX knockout models were not. CONCLUSION: The NCLX may be necessary but is not sufficient for Ca2+ homeostasis and viability.


Asunto(s)
Calcio/metabolismo , Supervivencia Celular/fisiología , Homeostasis/fisiología , Modelos Teóricos , Intercambiador de Sodio-Calcio/metabolismo , Algoritmos , Animales , Señalización del Calcio/fisiología , Ratones , Mitocondrias/metabolismo
10.
J Acoust Soc Am ; 144(4): EL268, 2018 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-30404480

RESUMEN

A hybrid method based on the finite-difference method and equivalence principle to simulate elastic wave scattering of three-dimensional objects is proposed. In this method, the near fields are first calculated in a rectangular volume containing the object by the finite-difference method. Then the displacements and tractions on a virtual surface are transformed to the far field by the application of the equivalence principle in elastodynamics. The feasibility is verified by comparing modeling results with the analytical solution for the canonical point force source radiation problem. Modeling for complex scatterer structures shows the advantage of this method in handling multi-scale scattering problems.

11.
J Acoust Soc Am ; 143(1): EL13, 2018 01.
Artículo en Inglés | MEDLINE | ID: mdl-29390740

RESUMEN

The seismoelectric interface electromagnetic characteristics have been studied for the finite offset Vertical Seismoelectric Profiling (VSEP) configuration. The approach consists of theoretical modeling and laboratory verification. The results show that the wave variation characteristics along the finite offset measurement line are markedly different from those along the zero-offset line. More interestingly, the wave characteristics for both configurations can be satisfactorily explained by the electric dipole model for the seismoelectric interface wave radiation. Besides, the experiment confirms the modeling result based on the seismoelectric coupling theory and validates the VSEP technique as an effective method for subsurface interface delineation.

12.
J Acoust Soc Am ; 144(3): EL178, 2018 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-30424672

RESUMEN

The development of acoustic source technology has been an important task for acoustic logging while drilling (LWD) and various source designs have been implemented. Using a multipole wave expansion theory, this study demonstrates that a LWD acoustic source can be represented as a combination of monopole, dipole, and quadrupole constituents and characterized by the contribution of each constituent. The theoretical analysis is experimentally demonstrated with a cylindrical pipe simulating the LWD collar. The result of this study can be used to provide a method for evaluating the performance of a LWD acoustic source.

13.
Cardiology ; 135(4): 255-261, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-27537503

RESUMEN

AIMS AND OBJECTIVES: The objective of this study was to assess the clinical feasibility of generating 3D printing models of left atrial appendage (LAA) using real-time 3D transesophageal echocardiogram (TEE) data for preoperative reference of LAA occlusion. BACKGROUND: Percutaneous LAA occlusion can effectively prevent patients with atrial fibrillation from stroke. However, the anatomical structure of LAA is so complicated that adequate information of its structure is essential for successful LAA occlusion. Emerging 3D printing technology has the demonstrated potential to structure more accurately than conventional imaging modalities by creating tangible patient-specific models. Typically, 3D printing data sets are acquired from CT and MRI, which may involve intravenous contrast, sedation, and ionizing radiation. It has been reported that 3D models of LAA were successfully created by the data acquired from CT. However, 3D printing of the LAA using real-time 3D TEE data has not yet been explored. METHODS: Acquisition of 3D transesophageal echocardiographic data from 8 patients with atrial fibrillation was performed using the Philips EPIQ7 ultrasound system. Raw echocardiographic image data were opened in Philips QLAB and converted to 'Cartesian DICOM' format and imported into Mimics® software to create 3D models of LAA, which were printed using a rubber-like material. The printed 3D models were then used for preoperative reference and procedural simulation in LAA occlusion. RESULTS: We successfully printed LAAs of 8 patients. Each LAA costs approximately CNY 800-1,000 and the total process takes 16-17 h. Seven of the 8 Watchman devices predicted by preprocedural 2D TEE images were of the same sizes as those placed in the real operation. Interestingly, 3D printing models were highly reflective of the shape and size of LAAs, and all device sizes predicted by the 3D printing model were fully consistent with those placed in the real operation. Also, the 3D printed model could predict operating difficulty and the presence of a peridevice leak. CONCLUSIONS: 3D printing of the LAA using real-time 3D transesophageal echocardiographic data has a perfect and rapid application in LAA occlusion to assist with physician planning and decision making.


Asunto(s)
Apéndice Atrial/patología , Procedimientos Quirúrgicos Cardíacos/instrumentación , Ecocardiografía Transesofágica , Impresión Tridimensional , Estudios de Factibilidad , Humanos , Medicina de Precisión
14.
Eur Spine J ; 25(1): 318-324, 2016 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-26070551

RESUMEN

PURPOSE: To translate quality of life questionnaire of the European foundation for osteoporosis (QUALEFFO-31) into a simplified Chinese version, and test its reliability and validity in osteoporosis patients from mainland Chinese population. METHODS: Postmenopausal osteoporosis women with history of vertebral fracture were included as cases, and age-matched healthy female were included as controls. All subjects were from mainland China. The simplified Chinese version of QUALEFFO-31 and SF-36 were assigned to the two groups. Reliability was assessed using kappa statistics of agreement for each item and the intra-class correlation coefficient (ICC). The internal consistency was assessed with Cronbach's α. Pearson's correlation was used to assess convergent and discriminant validity. RESULTS: Overall, 66 cases and 66 age-matched controls were included. The ICC for the test-retest reliability ranged from 0.76 to 0.91. Cronbach's α for pain, physical function, and mental function domains were 0.94, 0.87, and 0.79, respectively. Convergent validity and discriminant validity showed that each correlation coefficient between score of each item with total score of related domain was higher than that with total score of unrelated domain. Pearson's correlation coefficients indicated significantly high correlations between corresponding domains of QUALEFFO-31 and SF-36. CONCLUSIONS: The simplified Chinese version of the QUALEFFO-31 is a reliable and valid outcome measure of functional status in patients with osteoporosis. This Chinese version of the QUALEFFO-31 can be utilized for future clinical studies in mainland China.


Asunto(s)
Indicadores de Salud , Osteoporosis Posmenopáusica/diagnóstico , Calidad de Vida , Encuestas y Cuestionarios , Anciano , Estudios de Casos y Controles , China , Europa (Continente) , Femenino , Humanos , Persona de Mediana Edad , Reproducibilidad de los Resultados , Traducciones
15.
J Acoust Soc Am ; 140(2): EL211, 2016 08.
Artículo en Inglés | MEDLINE | ID: mdl-27586782

RESUMEN

The interaction of a fluid-filled borehole with incident elastic waves is an important topic for downhole acoustic measurements. By analyzing the wave phenomena of this problem, one can simulate the detection of a borehole target using a source-receiver system in a remote borehole. The analysis result shows that the wave signals from the target borehole are of sufficient amplitude even though the borehole size is small compared to wavelength. Consequently, the target borehole can be detected when the two boreholes are far away from each other. The result can be utilized to provide a method for testing downhole acoustic imaging tools.

16.
Eur Spine J ; 24(4): 737-43, 2015 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-25374300

RESUMEN

PURPOSE: To investigate the relationship between sagittal spinal alignment and the incidence of vertebral fracture in patients with osteoporosis. METHODS: A cohort of 1,044 postmenopausal women with osteoporosis were prospectively observed for the incidence of lumbar vertebral fracture. Baseline characteristics of the subjects were recorded, including age, year post-menopause, body height and weight, lumbar spine BMD (LSBMD) and femoral neck BMD (FNBMD). Patients with radiologically diagnosed lumbar vertebral fractures were assigned to the fracture group, and 150 randomly selected participants were assigned to the non-fracture group. Parameters depicting sagittal spinal alignment, including sacral slope (SS), pelvic tilt, pelvic incidence (PI), thoracic kyphpsis, lumbar lordosis (LL), lumbar lordosis index (LLI) and sagittal vertical axis, were measured for both groups. Comparison between the two groups was carried out by Student's t test. Variables showing significant differences were entered into a logistic regression analysis to determine the independent risk factors. RESULTS: Patients with fracture events had significantly lower LSBMD as well as a significantly longer year post-menopause. Besides, patients with vertebral fracture were found to have significantly lower LL, LLI, SS and PI. Regression analysis showed that LSBMD (OR = 0.27), LL (OR = 0.3), LLI (OR = 0.43) and PI (OR = 0.67) had significant associations with the risk of vertebral fracture. CONCLUSIONS: Osteoporosis patients with low LL, LLI, and PI could be at high risk of lumbar vertebral fracture. In addition to BMD, the abnormal sagittal spinal profile should also be taken into consideration when predicting the incidence of vertebral fracture in such patients.


Asunto(s)
Osteoporosis Posmenopáusica/complicaciones , Fracturas Osteoporóticas/etiología , Curvaturas de la Columna Vertebral/complicaciones , Fracturas de la Columna Vertebral/etiología , Anciano , Estatura , Densidad Ósea/fisiología , China/epidemiología , Femenino , Estudios de Seguimiento , Humanos , Incidencia , Vértebras Lumbares/lesiones , Vértebras Lumbares/fisiopatología , Persona de Mediana Edad , Osteoporosis Posmenopáusica/epidemiología , Osteoporosis Posmenopáusica/fisiopatología , Fracturas Osteoporóticas/epidemiología , Fracturas Osteoporóticas/fisiopatología , Pelvis/patología , Sacro/patología , Curvaturas de la Columna Vertebral/epidemiología , Curvaturas de la Columna Vertebral/patología , Fracturas de la Columna Vertebral/epidemiología , Fracturas de la Columna Vertebral/fisiopatología , Columna Vertebral/patología
17.
J Acoust Soc Am ; 138(5): EL447-51, 2015 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-26627812

RESUMEN

The stopband of pipe extensional waves is an interesting natural phenomenon. This study demonstrates an important extension of this phenomenon. That is, the stopband can be effectively broadened by transmitting the waves across the joint of pipes of different thickness. The theoretical and experimental results reveal the detailed process of stopband forming along the pipe and the band broadening across the pipe joint. The result can be utilized to provide a method for logging while drilling acoustic isolation design.

18.
Neurochirurgie ; 70(2): 101538, 2024 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-38311218

RESUMEN

BACKGROUND: Genetic polymorphism of KIAA1217 has been reported to be associated with lumbar disc herniation (LDH) in different populations such as Japanese population and Finnish population. This study aimed to explore whether the genetic polymorphism of KIAA1217 is functionally associated with LDH in Chinese population. METHODS: SNP rs16924573 of KIAA1217 was genotyped in 1272 patients and 1248 healthy controls. The mRNA expression of KIAA1217 in the intervertebral disc was analyzed for 84 patients and 32 controls. The differences of genotype and allele distributions between LDH patients and healthy controls were evaluated using the Chi-square test. One-way ANOVA test was used to compare the relationship between genotypes and tissue expression of KIAA1217. RESULTS: Patients were found to have significantly higher frequency of genotype GG of rs16924573 than the controls (64.2% vs. 52.8%, p<0.001). The frequency of allele G was remarkably higher in the patients than in the controls (79.8% vs. 73.2%, p<0.001), with an OR of 1.45 (95% confidential interval=1.27-1.66). Compared with the controls, LDH patients were observed to have significantly decreased expression of KIAA1217. Patients with genotype GG had remarkably lower mRNA expression of KIAA1217 than those with genotype AG or AA (p=0.01). CONCLUSIONS: SNP rs16924573 of KIAA1217 could be functionally associated with LDH in the Chinese population. More in vivo and vitro experiments need to be carried out to further clarify the regulatory mechanism of functional variants in KIAA1217.


Asunto(s)
Degeneración del Disco Intervertebral , Desplazamiento del Disco Intervertebral , Humanos , Estudios de Casos y Controles , China/epidemiología , Predisposición Genética a la Enfermedad/genética , Degeneración del Disco Intervertebral/genética , Desplazamiento del Disco Intervertebral/genética , Vértebras Lumbares , Polimorfismo de Nucleótido Simple/genética , ARN Mensajero
19.
Adv Rheumatol ; 64(1): 12, 2024 01 29.
Artículo en Inglés | MEDLINE | ID: mdl-38287451

RESUMEN

BACKGROUND: In a recent genome-wide association study, novel genetic variations of WNT9A were reported to be involved in the etiopathogenesis of thumb osteoarthritis (TOA) in Caucasians. Our purposes were to replicate the association of WNT9A with the development of TOA in the Chinese population and to further unveil the functional role of the risk variants. METHODS: SNP rs11588850 of WNT9A were genotyped in 953 TOA patients and 1124 healthy controls. The differences of genotype and allele distributions between the patients and healthy controls were evaluated using the Chi-square test. Luciferase Reporter Assay was performed to investigate the influence of variant on the gene expression. RESULTS: There was significantly lower frequency of genotype AA in TOA patients than in the controls 74.9% vs. 81.9%, p < 0.001). The frequency of allele A was remarkably lower in the patients than in the controls (86.3% vs. 90.5%, p < 0.001), with an odds ratio of 0.66 (95% CI = 0.54-0.80). Luciferase Reporter Assay showed that the construct containing mutant allele G of rs11588850 displayed 29.1% higher enhancer activity than the wild allele A construct (p < 0.05). CONCLUSIONS: Allele G of rs11588850 was associated with the increased risk of TOA possibly via up-regulation of WNT9A expression. Further functional analysis into the regulatory role of rs11588850 in WNT9A expression can shed new light on the genetic architecture of TOA.


Asunto(s)
Predisposición Genética a la Enfermedad , Osteoartritis , Humanos , Estudio de Asociación del Genoma Completo , Pulgar , Frecuencia de los Genes , Polimorfismo de Nucleótido Simple , Osteoartritis/genética , China , Luciferasas/genética , Proteínas Wnt/genética
20.
ISA Trans ; 143: 103-114, 2023 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-37673730

RESUMEN

This article studies the generalized efficient robust predictive control (GERPC) for the nonlinear systems denoted by interval type-2 (IT2) Takagi-Sugeno (T-S) fuzzy model over networks with consideration of packet dropout, bounded disturbance and adaptive event-triggered scheme (AETS). First, the packet dropout is described by a Bernoulli process, and an AETS with thresholds that can be self-regulated according to different situations is employed to decide whether to release data into the communication network, so as to reduce the data transmission frequency and the network burden; Second, taking into consideration of packet dropout and AETS, a unified IT2 T-S fuzzy control model based on GERPC is established, and the stability of closed-loop system with bounded disturbance is guaranteed by quadratic boundedness (QB) technique; Third, generalized efficient robust predictive controller is designed to obtain a larger initial feasible region, smaller online computation and acceptable control performance. The unconstrained control law is designed offline, and a new variable will be optimized online to achieve good control performance, which is introduced to adjust the control quantity. Then, the convex LMI reformulation method is utilized to handle non-convex terms in optimization problem, and the effectiveness of the GERPC algorithm is proved by the matrix partition technique. At last, the effectiveness of the designed controller based on the GERPC strategy is verified by a given simulation experiment.

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