Meta-analysis of the efficacy of invisible orthodontic appliances for maxillary molar distalization in adult patients / 口腔疾病防治

Objective@#To evaluate the clinical efficacy of invisible orthodontic appliances without brackets for the distal movement of maxillary molars to improve the ability of orthodontists to predict treatment outcomes.@*Methods@#Web of Science, Cochrane Library, Embase, PubMed, Wanfang Database, CNKI Database, and VIP Database were searched for studies investigating the efficacy of invisible orthodontic appliances for distal movement of maxillary molars in adult patients and published from database inception to August 1, 2023. A total of three researchers screened the studies and evaluated their quality and conducted a meta-analysis of those that met quality standards.@*Results@#This study included 13 pre- and postcontrol trials with a total sample size of 281 patients. The meta-analysis revealed no significant differences in the sagittal or vertical parameters of the jawbone after treatment when compared with those before treatment (P>0.05). The displacement of the first molar was MD=-2.34, 95% CI (-2.83, -1.85); the displacement was MD=-0.95, 95% CI (-1.34, -0.56); and the inclination was MD=-2.51, 95% CI (-3.56, -1.46). There was a statistically significant difference in the change in sagittal, vertical, and axial tilt of the first molar before and after treatment. After treatment, the average adduction distance of the incisors was MD=-0.82, 95% CI (-1.54, -0.09), and the decrease in lip inclination was MD=-1.61, 95% CI (-2.86, -0.36); these values were significantly different from those before treatment (P<0.05).@*Conclusion@#Invisible orthodontic appliances can effectively move the upper molars in a distal direction and control the vertical position of the molars. When the molars move further away, there is some degree of compression and distal tilt movement, which is beneficial for patients with high angles. The sagittal movement of incisors is beneficial for improving the patient's profile.

Diferencias biomecánicas entre jugadores avanzados y amateur en la ejecución del tiro libre en fútbol / Diferenças biomecânicas entre jogadores avançados e amadores na execução do pontapé livre no futebol / Biomechanical differences between advanced and amateur players in the execution of the free kick in soccer

RESUMEN El tiro libre en el fútbol es una de las técnicas deportivas de importancia, la cual permite reanudar el juego luego de la falta cometida por el otro jugador. La potenciación de la habilidad motriz específica permite desarrollar mayores rendimientos a corto y largo plazo, por lo cual su caracterización es importante para desarrollar metodologías especializadas en las etapas de iniciación deportiva. En tal sentido, la presente investigación tuvo por objetivo analizar las diferencias biomecánicas del tiro libre entre jugadores avanzados y amateur de fútbol. Este estudio es de tipo descriptivo-explicativo de orden correlacional, se diagnostican intencionalmente a 30 futbolistas de la Escuela de Fútbol Chiqui Park (16-32 años de edad), clasificados en dos grupos independientes, el grupo 1 con futbolistas avanzados, y el grupo 2 con futbolistas de nivel amateur. Se evalúan tres variables: el ángulo inicial de la Fase unipodal (AIFU), el ángulo final de la fase final (AFF), y el tiempo de ejecución del tiro libre (TE). No se evidencian diferencias significativas entre grupos independientes en las variables angulares AIFU (p=0.683) y AFF (p=0.389), y una diferencia significativa a favor del grupo 2 en la variable TE (p=0.000). Sin embargo, todos los rangos promedios favorecieron a los futbolistas de nivel avanzado. Existe la necesidad de establecer integralmente mayores estudios que caractericen las categorías formativas estudiadas, sirviendo de base teórica y metodología que fundamente el desarrollo de acciones técnico-tácticas y físicas de consideración en los procesos de dirección del entrenamiento deportivo.

RESUMO O pontapé livre no futebol é uma das técnicas desportivas mais importantes, que permite o reinício do jogo após uma falta cometida pelo outro jogador. A potenciação da habilidade motora específica permite o desenvolvimento de desempenhos mais elevados a curto e longo prazo, razão pela qual a sua caracterização é importante para desenvolver metodologias especializadas nas fases de iniciação ao desporto. Neste sentido, o objectivo desta investigação era analisar as diferenças biomecânicas do pontapé livre entre jogadores de futebol avançados e amadores. Este estudo é de um tipo descritivo-explicativo de ordem correlacional, 30 jogadores de futebol da Escola de Futebol do Chiqui Park (16-32 anos de idade) são intencionalmente diagnosticados, classificados em dois grupos independentes, grupo 1 com jogadores de futebol avançados, e grupo 2 com jogadores de futebol amadores. São avaliados os seguintes São avaliadas três variáveis de interesse: o ângulo inicial da fase unipodal (AIFU), o ângulo final da fase final (AFF), e o tempo de execução do lançamento livre (TE). Não foram evidentes diferenças significativas entre grupos independentes nas variáveis angulares AIFU (p=0,683) e AFF (p=0,389), e uma diferença significativa a favor do grupo 2 na variável TE (p=0,000). No entanto, todas as gamas médias favoreceram os jogadores de nível avançado. Há necessidade de estabelecer de forma abrangente outros estudos que caracterizem as categorias de formação estudadas, servindo como base teórica e metodológica para o desenvolvimento de ações técnico-tácticas e físicas de consideração nos processos de gestão da formação desportiva.

ABSTRACT The free kick in soccer is one of the important sports techniques, which allows the game to resume after a foul committed by the other player. The enhancement of specific motor skills allows the development of higher performance in the short and long term, for which its characterization is important to develop specialized methodologies in the stages of sports initiation. In this sense, the present research aimed to analyze the biomechanical differences of the free kick between advanced and amateur soccer players. This study is of a descriptive-explanatory type of correlational order, 30 soccer players from the Chiqui Park Soccer School (16-32 years of age) are intentionally diagnosed, classified into two independent groups, group 1 with advanced soccer players, and group 2 with amateur level soccerers. Three variables of interest are evaluated: the Initial Angle of the Unipodal Phase (AIFU in Spanish), the Final Angle of the Final Phase (AFF in Spanish), and the Execution Time of the Free Throw (TE in Spanish). There are no significant differences between independent groups in the angular variables AIFU (p=0.683) and AFF (p=0.389), and a significant difference in favor of group 2 in the variable TE (p=0.000). However, all the average ranges favored the advanced level players. There is a need to comprehensively establish larger studies that characterize the training categories studied, serving as a theoretical basis and methodology that supports the development of technical-tactical and physical actions of consideration in the processes of sports training management.

A Cross Sectional Study To Determine The Prevalance Of Occludable Angles In Hypermetropes

Background:Hypermetropic eyes are generally smaller in globe volume, resulting in crowding of anterior chamber when the lens size is normal.The aim of this study is to document the prevalence of occludable angles in hypermetropes visiting tertiary eye care centre of western region of India and to highlight the importance of screening for angle closure suspects inhigh risk groups. Material And Methods:This cross sectional study is based on clinical study of patients attended by M & J Western Regional Institute of Ophthalmology. The study group was divided into two subgroups: patients who are hyperopic on refraction and patients who are either emmetropic or myopic. Relative risk and Odd’s ratio was calculated for relation between refractive error and occludable angle. Result:Risk of Occludable angle in hypermetropes = 0.23.Risk of Occludable angle in myopes and emmetropes = 0.06. Relative risk in hypermetropes = 4.15 i.e. hypermetropes have nearly 4 times risk of developing occludable angle than myopes and emmetropes. Relative risk in myopes and emmetropes = 0.24 i.e. myopes and emmetropes have 0.24 times risk of de veloping occludable angle than hypermetropes.Odd’s ratio in the first group = 5.1 i.e. the possibility for a patient with occludable angle being a hypermetrope.Odd’s ratio in the second group = 0.2 i.e. the possibility for a patient with occludable angle being a myope or an emmetrope. Conclusion:When occludable angle is detected on gonioscopy in > 270 degrees, a peripheral iridectomy can be performed as a prophylactic measure and patients can be given a liberal follow up. A society like India where people have less awareness regarding glaucoma being a silent thief and not understanding the importance follow up examination in glaucoma, gonioscopy should be made a part of routine examination and peripheral iridotomy done as necessary.

The reliability of smartphone goniometry technology in measuring postural changes in South African female youths carrying head loads

Background: Four empirical studies have measured the impact of head-loading on female African porters posture using expensive radiography and manual kin anthropometry and goniometry. The reliability of cheaper, pragmatic smartphone goniometric technology as an alternate clinical tool to assess posture is needed. Objectives: This study was designed to test the inter-rater reliability of smartphone goniometry technology against manual goniometry in measuring selected sagittal postural angles in South African female youth who habitually head-load. Methods: Female South African youth who habitually headload voluntarily participated in the study (N = 100) and were randomly allocated into experimental (n = 50) and control (n = 50) groups. An observational randomized control design involving a pre-test post-test crossover was used, after which the control group crossed over into the experimental group and vice versa. The control group stood in the unloaded phase without a head load, while the experimental group carried the head load. The daily head loads and body mass were measured on an electronic scale. Demographic characteristics (age, body mass, and stature) were recorded and selected biomechanical angles were measured on the right side. Results: The mean age of the study participants was 12.3 ± 2.5 years; average body mass was 44.5 ± 13.7 kg. The average head load habitually carried was 8.0 ± 2.5 kg. The inter-rater reliability between the smartphone goniometry technology and manual goniometry was 0.9. Conclusion: The findings support the use of smartphone goniometry as a pragmatic method for assessing sagittal plane postural changes among rural South African youth who habitually head-load. Further studies are needed to validate these findings.

The relationship of the posterior cranial fossa with age and sex / Relación de la fosa craneal posterior con la edad y el sexo

SUMMARY: This paper determined the morphometric measurements of posterior cranial fossa using MRI in Turkish healthy population. Two hundred thirty one (231; 131 females and 100 males) subjects ranging from 20 up to 85 years were included in this study. Measurements of the posterior cranial fossa were taken from subjects having brain MRI in the Radiology Department, Adana, Turkey. Statistical analysis were done by SPSS 21.00 package programme. ANOVA Test and Chi-Square Test were used to determine the relation between measurements and age groups. The p<0.05 value was considered as significant. The overall means and standard deviations of the measurements were: Clivus length,31.10?5.45 mm; McRae line, 32.59?3.89 mm; Supraocciput length,41.99 ? 4.37 mm; Twining line, 79.23?5.53 mm; Posterior cranial fossa height, 66.76?5.06 mm; Cerebellum height, 55.17?5.29 mm; Clival angle, 125.59??6.57?; Cerebellar tentorium angle, 128.30??7.77? mm, Occipital protuberance angle, 93.27??8.02? and hindbrain vertical length, 50.56?3.47 mmin females, respectively, whereas the corresponding values were 32.43?5.99 mm; 32.85?3.77 mm; 42.46?4.68 mm; 80.95?5.94 mm; 69.70?4.67mm; 57.01?3.43 mm; 123.90??7.12? 128.80?8.33?; 95.35?9.19? and 52.71?3.33 mm in males, respectively. Significant difference was found in some parameters such as twining line, posterior cranial fossa height, cerebellum height and hindbrain vertical length between sex (p<0.05). Also, ages were divided into six groups as decades. Significant difference between six decades was also found in parameters including McRae line, twining line, posterior cranial fossa height, cerebellum height, clival angle, cerebellar tentorium angle, occipital tuberance angle and hindbrain vertical length (p<0.05). The posterior cranial fossa dimensions of healthy population provides important and useful knowledge in terms of comparison of abnormalities clinically, and data can be used as an anatomical landmark during surgery involving posterior cranial fossa.

RESUMEN: Se determinaron las medidas morfométricas de la fosa craneal posterior mediante resonancia magnética en una población turca. Se incluyeron doscientos treinta y un (231; 131 mujeres y 100 hombres) sujetos sanos con edades entre los 20 y los 85 años. Por medio de una resonancia magnética cerebral se tomaron medidas de la fosa craneal posterior de sujetos en el Departamento de Radiología de Adana, Turquía. El análisis estadístico se realizó mediante el programa de SPSS 21.00. Se utilizó la prueba ANOVA y la prueba de chi-cuadrado para determinar la relación entre las medidas y los grupos de edad. Se consideró significativo el valor de p <0,05. Las medias generales y las desviaciones estándar de las medidas en las mujeres fueron: longitud del clivus, 31,10 ? 5,45 mm; Línea McRae, 32,59 ? 3,89 mm; Longitud del supraoccipucio, 41,99 ? 4,37 mm; línea de Twining (desde el tubérculo selar hasta la confluencia de los senos), 79,23 ? 5,53 mm; Altura posterior de la fosa craneal, 66,76 ? 5,06 mm; Altura del cerebelo, 55,17 ? 5,29 mm; Ángulo clival, 125,59 ? ? 6,57 ?; Ángulo del tentorio cerebeloso, 128,30 ? ? 7,77 ? mm, Angulo de protuberancia occipital, 93,27 ? ? 8,02 ? y Longitud vertical del rombencéfalo, 50,56 ? 3,47 mm. En los hombres los valores obte- nidos fueron 32,43 ? 5,99 mm; 32,85 ? 3,77 mm; 42,46 ? 4,68 mm; 80,95 ? 5,94 mm; 69,70 ? 4,67 mm; 57,01 ? 3,43 mm; 123,90 ? ? 7,12 ? 128,80 ? 8,33 ?; 95,35 ? 9,19 ? y 52,71 ? 3,33 mm, respectivamente. Se encontraron diferencias significativas entre ambos sexos (p <0,05) en algunos de los parámetros, como la línea de Twining, la altura de la fosa craneal posterior, la altura del cerebelo y la longitud vertical del rombencéfalo. También se encontró una diferencia significativa entre las edades de los individuos (división en seis décadas) en los parámetros que incluyen la línea de McRae, la línea de Twining, la altura de la fosa craneal posterior, la altura del cerebelo, el ángulo de clivación, el ángulo de la tienda del cerebelo, el ángulo de protuberancia occipital y la longitud vertical del rombencéfalo (p <0,05). La población estudiada nos proporciona información importante y útil en términos de comparación clínica de anomalías y los datos pueden eventualmente ser utilizados como un punto de referencia anatómico durante la cirugía que involucra la fosa craneal posterior.

Eficacia en el tiro de la pistola de aire bajo condiciones normales y de excitación / Eficiência de tiro com pistola de ar em condições normais e de excitação / Air pistol firing efficiency under normal and excitation conditions

RESUMEN El tiro es practicado en su mayoría por policías o militares. Ha llegado a ser un deporte olímpico donde se destaca la prueba de pistola con aire, la cual requiere una concentración mental extrema y precisión en sus movimientos para lograr efectividad en el disparo. En este trabajo, los autores se propusieron como objetivo identificar los datos cinemáticos del complejo brazo-arma en estado normal y de excitación durante la ejecución del tiro, considerando variables a la frecuencia cardíaca, la efectividad del disparo y los ángulos de las principales articulaciones (glecohumeral) que permiten la ejecución de la técnica. Como parte de la metodología, esta investigación se implementó en el polígono de tiro cerrado de la Escuela Superior Militar "Eloy Alfaro" y se analizaron a siete deportistas que conforman los equipos de Tiro de la Fuerza Terrestre y Aérea ecuatoriana. Se analizó la frecuencia cardíaca (en cuatro fases), la efectividad del disparo (en tres oportunidades) y el ángulo de la articulación glenohumeral en estado de reposo y en excitación, donde se realizaron las comparaciones pertinentes. Como resultados del estudio, se muestra que los valores medios de la frecuencia cardíaca fueron significativamente diferentes (p=0.001), al ser mayores en estado de excitación. La efectividad del disparo no establece diferencias significativas (p=0.620) entre estados, al igual que los ángulos de la articulación glenohumeral (p=0.209). Se concluye que no hay diferencias significativas en la efectividad de los disparos en excitación y en reposo, indicador de una buena preparación física, aunque hay menor efectividad del disparo en estado de excitación.

RESUMO O tiro é praticado principalmente pela polícia ou militares, tornou-se um desporto olímpico onde se destaca o exame da pistola de ar, o que requer uma concentração mental extrema e precisão nos seus movimentos para se conseguir eficácia no tiro. Neste trabalho, os autores visam identificar os dados cinemáticos do complexo braço-arma em estado normal e excitado durante a execução do tiro, considerando variáveis como o ritmo cardíaco, a eficácia do tiro e os ângulos das articulações principais (glecohumeral) que permitem a execução da técnica. Como parte da metodologia, esta pesquisa foi implementada na carreira de tiro fechado da Escola Superior Militar "Eloy Alfaro" e foram analisados sete atletas que compõem as equipas de tiro do Exército e da Força Aérea equatoriana. O ritmo cardíaco foi analisado (em quatro fases), a eficácia do tiro (em três oportunidades) e o ângulo da articulação glenoumeral em estado de repouso e em excitação, onde foram feitas as comparações correspondentes. Como resultados do estudo, mostra-se que os valores médios da frequência cardíaca eram significativamente diferentes (p=0,001), sendo mais elevados no estado excitado. A eficácia do tiro não estabelece diferenças significativas (p=0,620) entre estados físicos, bem como os ângulos de articulação glenoumeral (p=0,209). Conclui-se que não há diferenças significativas na eficácia de disparar em estado de excitação e em repouso, um indicador de boa preparação física, embora haja menos eficácia de disparar em estado de excitação.

ABSTRACT Shooting is practiced mostly by police or military, it has become an Olympic sport where the air pistol test stands out, which requires extreme mental concentration and precision in its movements to achieve effectiveness in the shot. In this work, the authors aim to identify the kinematic data of the arm-weapon complex in normal and excited state during the execution of the shot, considering variables such as heart rate, the effectiveness of the shot and the angles of the main joints (glecohumeral) that allow the execution of the technique. As part of the methodology, this research was implemented in the closed shooting range of the Escuela Superior Militar "Eloy Alfaro" and seven athletes that form the shooting teams of the Ecuadorian Army and Air Force were analyzed. The heart rate (in four phases), the effectiveness of the shot (in three opportunities) and the angle of the glenohumeral joint in resting and excited states were analyzed, where the pertinent comparisons were made. As results of the study, it is shown that the mean values of the heart rate were significantly different (p=0.001), being higher in the excited state. The effectiveness of the shot does not establish significant differences (p=0.620) between states, as well as the glenohumeral joint angles (p=0.209). It is concluded that there are no significant differences in the effectiveness of shooting in excitement and at rest, an indicator of good physical preparation, although there is less effectiveness of shooting in the excited state.

Digital three-dimensional morphology of cervical joint facet in 7-12-year-old children / 中国组织工程研究

BACKGROUND: Lots of researches by domestic and foreign scholars have confirmed that the asymmetry of facet joint surface or the articular angles might cause the degeneration of the facet joints, and the articular spondylolisthesis. But most of the studies focus on the adult. It has been confirmed that the most common cause of the cervical disease, of the osteoarthritis, of the neurovascular compression or even the paralysis is the pathological changes of facet joint for people as they grow older. There are few studies on the facet joints in children. OBJECTIVE: To explore the cervical joint facet morphology development characteristics and age-related changes by collecting the CT scanning data of cervical vertebrae in children aged 7-12 years old, three-dimensional reconstruction and cervical facet joint morphology measurement and analysis. METHODS: Through collecting the data of multi-layers spiral CT scan of children in the First Affiliated Hospital and Second Affiliated Hospital of Inner Mongolia Medical University and Inner Mongolia International Mongolian Hospital from September 2013 to September 2015, 99 cases of cervical structures were selected. Then DICOM format of original data were imported in Mimics software for three-dimensional reconstruction. Morphological measurement was conducted on the three-dimensional model. The study was approved by the Ethical Committee of Inner Mongolia Medical University on March 11, 2015, approval No. YKD2015049. RESULTS AND CONCLUSION: (1) The length of children cervical joint facet was on a rise with age and a decreasing trend with ordinal number of vertebrae. (2) The width of children middle upper cervical joint facet showed “V” type. The width of children lower cervical joint facet increased with the increase of vertebral order. (3) The trend of distance between articular tubercles was “spike” shape. (4) The coronal angle of joint facet presented to be “V” shape. (5) The sagittal angle of joint facet was in inverted “V” shape. (6) In summary, there is no asymmetry of articular process in the morphological characteristics of cervical facet joints in 7-12-year-old children.

Gender Differences in Spinal Morphological Attributes among Young Adults: A Preliminary Study / Jurnal Sains Kesihatan Malaysia

There is limited information regarding gender differences in spinal morphological attributes among healthy young adultsalthough alterations have been reported to influence postural changes, mainly with forward-bending and extensionpostures. The aim of this preliminary study was to examine gender differences in spinal morphological attributes oflumbar extensor muscles that includes its muscle fibre angles, thickness, endurance and thoracolumbar curvature amongyoung adults. Nineteen male and 26 female healthy young adults (aged 21-24 years) matched for age, body mass indexand physical activity levels participated in this preliminary study. Fibre angles and thickness of lumbar extensor muscleswere examined using ultrasonography. Lumbar extensor muscle endurance and thoracolumbar curvatures were assessedusing Sorenson’s test and a flexible ruler respectively. Paired t-test showed a significant mean difference (p < 0.01)between the right and left fibre angles. However, no significant mean difference (p = 0.50) was found between the rightand left muscle thickness. Results of independent t-test showed a significant difference (p < 0.01) in muscle thicknessbetween males and females. No significant differences were shown in right fibre angle (p = 0.12), left fibre angle (p =0.89), muscle endurance (p = 0.46), thoracic curvature (p = 0.76) and lumbar curvature (p = 0.06) between genders.There were no gender differences in spinal morphological attributes except for lumbar extensor muscle thickness inyoung adults age between 21 to 24. This study data may be useful as an initial reference norm of spinal morphologicalattributes among young adults. Further studies may be required to examine the factors that may influence changes inspinal morphological attributes among healthy adults.

Measurements of femoral angles, femur length, and hip width in cat radiographs / Medidas dos ângulos femorais, comprimento do fêmur e largura do quadril em radiografias de gatos

Femoral angle, femur length, and hip width were measured in radiographs of 92 intact domestic cats, males and females of mixed breed from the Center for Zoonosis Control of the Federal District. The animals showed no trauma, orthopedic diseases or angular deformities and had closed physeal lines. Accordingly, we measured aLPFA (anatomical lateral proximal femoral angle, aLDFA (anatomical lateral distal femoral angle), mLPFA (mechanical lateral proximal femoral angle), mLDFA (mechanical lateral distal femoral angle), IA (femoral inclination angle), FL (femur length) and HW (hip width) using ventrodorsal radiographs, with both hindlimbs in a single exposure to an X-ray beam centered on the hip. The mean values of the variables were: mLPFA: 82.5±3.62°; aLPFA: 80.1±4.29°; mLDFA: 96.1±3.51° (males) and 97.3±2.05° (females); aLDFA: 94,3±3.43°; IA: 136.6±3.86°; FL: 12.9±0.55cm (males) and 13.4±0.66cm (females); and HW: 3.1cm±0.23 (males) and 3.5±0.26cm (females). These values will serve as a reference for the diagnosis of angular deformities and as support for planning corrective osteotomies in domestic cats.(AU)

Foram realizadas mensurações radiográficas dos ângulos femorais e medidas lineares do quadril e do fêmur em 92 gatos domésticos, machos e fêmeas, SRD, oriundos do Centro de Controle de Zoonoses do Distrito Federal, livres de traumas, doenças ortopédicas e deformidades angulares em membros pélvicos, portadores de linhas fiseais fechadas, não castrados. Para tanto, foram obtidos os ângulos aLPFA (ângulo anatômico lateral proximal do fêmur), aLDFA (ângulo anatômico lateral distal do fêmur), mLPFA (ângulo mecânico lateral proximal do fêmur), mLDFA (ângulo mecânico lateral distal do fêmur), AI (ângulo de inclinação do fêmur), CF (comprimento femoral) e LQ (largura de quadril), empregando radiografias em projeções ventrodorsais, com ambos os membros em uma única exposição ao feixe de raios-X, centrada no quadril. Após a apuração dos resultados, os valores médios obtidos foram: mLPFA: 82,5°±3,62, aLPFA: 80,1°±4,29; mLDFA: 96,1°±3.51 (machos) e 97,3°±2,05 (fêmeas), aLDFA: 94,3,6°±3,43; AI: 136,6°±3,86; CF: 136,6°±3,86; 12,9cm±0,55 (machos) e 13,4cm±0,66 (fêmeas) e LQ: 3,1cm±0,23 (machos) e 3,5cm±0,26 (fêmeas), respectivamente. Esses valores servem como referenciais para diagnósticos de deformidades angulares e apoio para planejamento de osteotomias corretivas em felinos domésticos.(AU)

Study of the correlation between different upper limb abduction angles and the occurrence of malposition of PICC into internal jugular vein / 中华护理杂志

Objective To investigate the effects of different upper limb abduction angles on the occurrence of malposition of PICC into internal jugular vein. Methods Totally 210 cases of patients treated with PICCs for unilateral breast cancer of our hospital from August,2015 to January,2017 were randomly assigned to three groups with 70 cases in each group. The abduction angle of the upper limb for placement was set at 45° ,90° and 160° , respectively. We chose the basilic vein of the uninfected arm using modified Seldinger technique under the guidance of ultrasound for PICC,and malposition was confirmed by detecting the tip of PICC in internal jugular vein. Results The incidence rate of internal jugular venous dislocation in 45° group was 7.14%(5 cases) and 8.57% in 90° group (6 cases),and no internal jugular venous dislocation in 160° group. There was no statistically significant difference among 45°,90° and 160° groups(χ2=5.95,P>0.05). Significant differences of group comparisons for 45° v.s. 160° and 160° v.s. 90° were found (P0.05). Conclusion Abduction angles of 45° ,90° and 160° can all be used for PICC placement. The abduction angle can be selected according to specific situation of patients instead of being limited to the standard abduction angle of 90°.

Anatomical study of petrous and cavernous parts of internal carotid artery / 대한해부학회지

The petrous and cavernous parts of internal carotid artery (ICA) are obscure and are not readily accessible to observation/imaging. These parts have broad biological and medical interest because of their peculiar shape. Given the their clinical importance and the scarce data available based mostly on imaging, the present study was aimed at studying these parts of ICA by dissection. The study was carried out on 56 ICAs obtained from embalmed adult cadavers and 10 ICAs from five fetuses. The foetal ICAs were studied in situ. The morphometric analysis of the adult ICA was done after its removal from cranial cavity to gain an insight into the geometry of the vessel, i.e., length, various bends, and diameters at various locations. ICAs in fetuses ran a relatively straighter course taking gentle curves at three positions (two intrapetrous, one cavernous). Adult ICAs were more tortuous and exhibited greater variability in length and angulations. The length of respective portions of the ICA correlate negatively with the measure of angles. The angles in the petrous and cavernous parts were positively correlated to each other. The carotid siphon was positively, highly significantly correlated to other angles. Longer vessels are more tortuous with acute bends. An acute carotid siphon is an indication of more tortuous ICA. The findings of the present study have created a reference data of unsuspected adult population and has potential implications for studying cause/effect relationship of vessel geometry and hemodynamic factors.

Distribution of Facial Exposure to Non-melanoma Biologically Effective UV Irradiance Changes by Rotation Angles / 生物医学与环境科学（英文）

<p><b>OBJECTIVE</b>To show the distribution of facial exposure to non-melanoma biologically effective UV irradiance changes by rotation angles.</p><p><b>METHODS</b>This study selected the cheek, nose, and forehead as representative facial sites for UV irradiance measurements, which were performed using a rotating manikin and a spectroradiometer. The measured UV irradiance was weighted using action spectra to calculate the biologically effective UV irradiances that cause non-melanoma (UVBEnon-mel) skin cancer. The biologically effective UV radiant exposure (HBEnon-mel) was calculated by summing the UVBEnon-mel data collected over the exposure period.</p><p><b>RESULTS</b>This study revealed the following: (1) the maximum cheek, nose and forehead exposure UVA and UVB irradiance times and solar elevation angles (SEA) differed from those of the ambient UV irradiance and were influenced by the rotation angles; (2) the UV irradiance exposure increased in the following order: cheek < nose < forehead; (3) the distribution of UVBEnon-mel irradiance differed from that of unweighted UV radiation (UVR) and was influenced by the rotation angles and exposure times; and (4) the maximum percentage decreases in the UVBEnon-mel radiant exposure for the cheek, nose and forehead from 0°to 180°were 48.41%, 69.48% and 71.71%, respectively.</p><p><b>CONCLUSION</b>Rotation angles relative to the sun influence the face's exposure to non-melanoma biologically effective UV.</p>

To analyze the performances and the related measurement values for femoro-acetabular impingement on MSCT / 实用放射学杂志

Objective To investigate the performances and characteristics of femoro-acetabular impingement (FAI)on MSCT. Methods Hips jointed MSCT scans of 109 cases (as case group)and the other 120 cases (as control group)were analyzed retrospec-tively,to analyze the anatomy and osseous abnomality of FAI.Alpha angle,offset,CE angle were measured.The data were tested by using t test and ANOVA test.Results There were 57 cases of osseous protuberance at the femoral head and neck joint,26 cases of the offset reduction,17 cases of over-coverage acetabulum,41 cases of over-deep acetabulum,20 cases of acetabular retroversion,57 cases of subcortical cystic degeneration at the femoral head and neck joint and 22 cases of subchondral cystic degeneration at the ace-tabulum margin.Significant statistical differences were found between case group and control group in alpha angle value,offset and CE angle (P<0.05).Multiple comparisons demonstrated that except results between the value of alpha angle of Cam-type and Mixed-type(P=0.071),Pincer-type and the control group(P=0.083)with no statistical significance,the differences between any other two groups reached statistical significance (P<0.05).Multiple comparisons demonstrated that except result between the value of offset of Cam-type and Mixed-type(P=0.561)with no statistical significance,the differences between any other two groups reached statistical significance (P<0.05).Multiple comparisons demonstrate that except results between the value of CE angle Pin-cer-type and Mixed-type (P=0.444),Cam-type and the control group (P=0.236)with no statistical significance,the differences be-tween any other two groups reached statistical significance (P<0.05).Conclusion Different type of FAI has its unique anatomical features.Alpha angle,offsetand CE angle for the diagnosis of FAI have important reference values.

Analysis of pathogenic factors for C5 palsy after open-door laminoplasty / 天津医药

Objective To discuss the risk factors of C5 never palsy incidence after cervical open-door laminoplasty. Methods This study involved 254 patients with cervical spondylotic myelopathy, who underwent expansive open-door lam?inoplasty in our hospital between January 2009 and December 2012. Patients were divided into two groups according to the incidence of C5 palsy after operation. Group A included 20 patients with C5 palsy and group B included 234 cases without C5 palsy. The risk factors for postoperative C5 palsy were compared between two groups. The factors may affect the inci?dence of C5 palsy were analyze. Results All cases received follow-up with an average follow-up time (24.9±2.6) months. Values of cervical curvature index (CCI), lamina open angles and spinal cord shift were significantly greater in group A than those of group B (P0.05). Results of Logistic regres?sion analysis of multiple factors showed that lamina open angles, the pathogenic factors of C5 palsy included the spinal cord shift and postoperative CCI [OR(95%CI):2.035(1.684-2.359), 3.542 (2.465-9.254) and 9.126(4.425-17.273). Conclusion The angle of open door too large, CCI and spinal cord shift are risk factors for postoperative C5 palsy.

Cardiopulmonary function and scoliosis severity in idiopathic scoliosis children / 소아과

PURPOSE: Idiopathic scoliosis is a structural lateral curvature of the spine of unknown etiology. The relationship between degree of spine curvature and cardiopulmonary function has not yet been investigated. The purpose of this study was to determine the association between scoliosis and cardiopulmonary characteristics. METHODS: Ninety children who underwent preoperative pulmonary or cardiac evaluation at a single spine institution over 41 months were included. They were divided into the thoracic-dominant scoliosis (group A, n=78) and lumbar-dominant scoliosis (group B, n=12) groups. Scoliosis severity was evaluated using the Cobb method. In each group, relationships between Cobb angles and cardiopulmonary markers such as forced vital capacity (FVC), forced expiratory volume in one second (FEV1), FEV1/FVC, left ventricular ejection fraction, pulmonary artery flow velocity, and tissue Doppler velocities (E/E', E'/A') were analyzed by correlation analysis linear regression. RESULTS: In group A, 72 patients (92.3%) underwent pulmonary function tests (PFTs), and 41 (52.6%) underwent echocardiography. In group B, 9 patients (75.0%) underwent PFT and 8 (66.7%) underwent echocardiography. Cobb angles showed a significant negative correlation with FVC and FEV1 in group A (both P<0.05), but no such correlation in group B, and a significant negative correlation with mitral E/A ratio (P<0.05) and tissue Doppler E'/A' (P<0.05) in group A, with a positive correlation with mitral E/A ratio (P<0.05) in group B. CONCLUSION: Pulmonary and cardiac function was significantly correlated with the degree of scoliosis in patients with thoracic-dominant scoliosis. Myocardial diastolic function might be impaired in patients with the most severe scoliosis.

Measurement of Opening and Closing Angles of Aortic Valve Prostheses In Vivo Using Dual-Source Computed Tomography: Comparison with Those of Manufacturers' in 10 Different Types

OBJECTIVE: The aims of this study were to compare opening and closing angles of normally functioning mechanical aortic valves measured on dual-source computed tomography (CT) with the manufacturers' values and to compare CT-measured opening angles according to valve function. MATERIALS AND METHODS: A total of 140 patients with 10 different types of mechanical aortic valves, who underwent dual-source cardiac CT, were included. Opening and closing angles were measured on CT images. Agreement between angles in normally functioning valves and the manufacturer values was assessed using the interclass coefficient and the Bland-Altman method. CT-measured opening angles were compared between normal functioning valves and suspected dysfunctioning valves. RESULTS: The CT-measured opening angles of normally functioning valves and manufacturers' values showed excellent agreement for seven valve types (intraclass coefficient [ICC], 0.977; 95% confidence interval [CI], 0.962-0.987). The mean differences in opening angles between the CT measurements and the manufacturers' values were 1.2degrees in seven types of valves, 11.0degrees in On-X valves, and 15.5degrees in ATS valves. The manufacturers' closing angles and those measured by CT showed excellent agreement for all valve types (ICC, 0.953; 95% CI, 0.920-0.972). Among valves with suspected dysfunction, those with limitation of motion (LOM) and an increased pressure gradient (PG) had smaller opening angles than those with LOM only (p < 0.05). CONCLUSION: Dual-source cardiac CT accurately measures opening and closing angles in most types of mechanical aortic valves, compared with the manufacturers' values. Opening angles on CT differ according to the type of valve dysfunction and a decreased opening angle may suggest an elevated PG.

Using compensate angles to correct rotation set-up errors in radiotherapy / 中国医学装备

Objective:The purpose of this paper is to introduce a method of using compensate angles to eliminate rotation set-up errors without six-degree of freedom couch. Methods: To detect six-degree of freedom set-up errors, cone-beam computed tomography (CBCT) scans were acquired. These set-up errors were defined as a matrix to transform from accelerator coordinate system to patient coordinate system. Two independent vectors were defined to describe angles of gantry, collimator and couch in accelerator machine. Transformation of vectors were determined by transformation matrix and re-calculated back to the machine angles. Results:It was found that compensate angles can fully corrected the rotation angles in set-up with limited time consuming. It is feasible to implement compensate angles in routinely radiation procedure. Conclusion:With this method, it is possible to implement the complete corrections of set-up errors in radiotherapy without six-degree of freedom couch and it is convenient in operation as well.

Measurement of mandibular angle related angles by three dimensional reconstruction and their correlation analysis / 中华医学美学美容杂志

Objective To explore the correlation of data obtained through three dimensional reconstruction and measurement of mandibular angle related angles and bigonial breadth.Methods Sixty cases of adult female head spiral CT data were involved in this study.By the three dimensional reconstruction,mandibular angle related angles and bigonial breadth were measured.Through SPSS13.0 software their correlation was analyzed,including among mandibular angle related angles and these with bigonial breadth.Results The related data of the mandibular angle were measured on the image of three dimensional reconstruction; the mandibular angle was (124.28-±-4.12)°,the mandibular elevated angle was (25.52±2.22)°,the valgus angle of mandibular angle was (9.35±7.85)°,the mandiblular included angle was (77.32 ± 2.34)°,and the tangent angle of mandible was (105.53 ± 1.79)°.The correlation analysis of the related angles of mandibular angle and bigonial breadth showed that there was a significant correlation between the angles.Conclusions Three dimensional reconstruction and measurement of mandibular angle related angles and their correlation analysis can provide theoretical foundation and basis for the preoperative design and effect evaluation of mandibular angle plastic surgery.

Preliminary study of the relationship between the ischemic mitral regurgitation mechanism and geometric structure of the mitral valve in the papillary muscle dysfunction / 中华超声影像学杂志

Objective To study the relationship between ischemic mitral regurgitation and geometric angles of the mitral valve leaflets in patients with coronary artery disease and papillary muscle dysfunction by transesophageal echocardiography(TEE) ,and to evaluate anatomy and pathophysiology mechanicm of the ischemic mitral regurgitation with left ventricular papillary muscle dysfunction .Methods A total of 84 subjects were enrolled in this study .All of the subjects were divided into group A (healthy volunteers constituted the control group ,n =40) ,group B (chronic inferior or posterior myocardial infarction patients with papillary muscle dysfunction group ,n =44) ,group C(patients from group B after mitral valvuloplasty surgery ,n = 20) .The relationship between mitral regurgitation and geometric angles of the mitral valve leaflets and mitral annulus were studied by TEE .Results Geometric angle between the mitral valve leaflets and mitral annulus were significantly larger in group B ,and geometric angles of the mitral valve leaflets and mitral annulus was positive correlated with degree of mitral regurgitation .Degree of mitral regurgitation significantly reduced in group C ,no significant difference was found at the geometric angles of the mitral valve leaflets and mitral valve annular compared with group A .Conclusions The degree of mitral regurgitation were highly correlated with geometric angles of the mitral valve leaflets and mitral valve annular in patients with left ventricular papillary muscle dysfunction caused by coronary heart disease .Repair of the mitral valve leaflets surgery can significantly reduce geometric angles of the mitral valve leaflets and mitral valve annular ,and reduce the degree of mitral regurgitation significantly .