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RESUMEN La imagen corporal varía a lo largo de la vida. Los cambios físicos que conlleva la adolescencia, pueden influir en el desarrollo de conductas de riesgo para trastornos alimentarios. Aunque los factores sociales y culturales afectan la imagen corporal, las formas de interacción modernas, mediante el uso de tecnología, en particular las redes sociales, permiten controlar la autopresentación de la imagen corporal en las fotografías que son publicadas, lo que podría servir como indicador de conductas de riesgo alimentarias. El objetivo de este trabajo fue establecer la asociación de conductas alimentarias de riesgo con el control de la imagen corporal en fotografías, para analizar su invarianza factorial por sexo y proponer puntos de corte en población mexicana. La muestra estuvo conformada por 1 155 adolescentes (51.3 % hombres y 48.7 % mujeres), con una media de edad de 15.18 años. Se utilizó el cuestionario en español sobre el control de la imagen corporal en fotografías denominado BICP-S, además del cuestionario de conductas alimentarias de riesgo (CAR). Los resultados evidenciaron una relación entre las conductas alimentarias de riesgo y el control de la imagen en fotografías. La estructura factorial del BICP-S varía en función del sexo, por lo que se proponen diferentes puntos de corte del cuestionario, en donde aquellas ubicadas en el percentil 85 indican riesgo acerca de las preocupaciones por la imagen corporal en mujeres, mientras que en hombres se establece en el percentil 92, con una alta confiabilidad en el control de la imagen en ambos sexos (α > 0.90). El cuestionario tiene utilidad clínica para la detección de jóvenes con serias preocupaciones en torno a la imagen corporal que, de continuar, pueden constituirse en un factor de riesgo para trastornos de la conducta alimentaria.
ABSTRACT Body varies throughout life. Physical changes that take place during teenage years may influence the development of risky behaviors related to eating disorders. Although social and cultural factors affect body image, modern forms of interaction with technology, particularly social networks, allow controlling the self-presentation of body image in the photographs that are published, which could serve as an indicator of risky eating behaviors. The aim of this study was to establish the association of risky eating behaviors with the body image control in photographies, to analyze the factorial invariance by sex and to propose cut-off points in the Mexican population. The sample consisted of 1 155 adolescents (51.3 % males and 48.7 % females), with a mean age of 15.18 years. The BICP-S was used, in addition to the risky eating behaviors questionnaire (CAR). The results showed a relationship between risky eating behaviors and image control in photographs. The factorial structure of the BICP-S varies according to sex, so different cut-off points of the questionnaire are proposed, where those located at the 85th percentile indicate risk about body image concerns in women, while in men it is established at the 92nd percentile, with a high reliability in image control in both groups (α > 0.90). It is concluded that the questionnaire has clinical utility for the detection of at-risk youth who may have serious body image concerns, which if continued can be a risk factor for eating disorders.
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Objective To image the veins around the foramen of monro (FM), to build the 3D model of them, to construct venous network in this area and to explore the spatial positional correlation between FM and veins around it. Methods Totally 60 healthy subjects were selected to get the original images on 3. 0 T MR and procesed the original images by minimum intensity projections (mIP) and Materialise’ s interactive medical image control system (Mimics), built the 3D model of the veins around FM, observed and analyzed the morphology of FM and the veins around it on original and processed images. Results The displaying rate of FM was 65% (78 sides), the displaying rate of internal cerebellar veins (ICV) was 100% (120 sides), the diameter was (2. 13±0. 30) mm. The displaying rate of anterior septal vein (ASV) was 100% (120 sides), the diameter was(0. 69±0. 19)mm. The displaying rate of superior thalamostriate vein (STV) was 98. 3% (118 sides), the diameter was (1. 47± 0. 38) mm. The displaying rate of superior choroidal vein (SCV) was 82. 5% (99 sides), the diameter was(0. 40±0. 18)mm. According to the relationship between the converging point of the tributaries of ICV and the location of FM, FMs were classified into 5 types:ⅠA, 24. 2% (29 sides), ASV converged into ICV at the venous angle and closed to the posterior edge of FM; ⅠB, 13. 3% (16 sides), ASV converged into ICV away from the venous angle and the posterior edge of FM; ⅡA, 45% (54 sides), ASV converged into ICV at the false venous angle and closed to the posterior edge of FM; ⅡB, 15. 8% (19 sides), ASV converged into ICV away form the false venous angle and the posterior edge of FM. Ⅲ, 1. 7% (2 sides), STV was absent. Conclusion FM and the veins around it are visible on the susceptibility weighted imaging(SWI). It can be constructed by Mimics that the 3D model of ICV, its tributaries, FM and the converging points of the major veins. The classification of FMs is meaningful to the option of surgical approaches through FM.
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Objective To evaluate the advantages of reconstructing by mimics software before operation a three-dimensional model of talar posterior process fracture which is to be used in the treatment of talar posterior process fracture through the posteromedial malleolar approach.Methods From May 2015 to February 2019,7 patients with talar posterior process fracture were treated at Department of Orthopaedic Trauma,Jishuitan Hospital.They were 5 men and 2 women,aged from 20 to 70 years (mean,39 years).They underwent routine CT examination preoperatively.Their posterior process of talus was reconstructed by Mimics software based on their CT scanning data before operation to determine the size,number and displacement of fracture fragments.Their fractures of posterior process of talus were treated by open reduction and screw fixation in prone position through the posterior ankle approach.The American Orthopedic Foot & Ankle Society (AOFAS) ankle-hindfoot scoring system was used to evaluate functional recovery.Results The operation time for this group ranged from 70 min to 105 min,averaging 87.1 min.Early after operation,the wounds healed well with no injury to nerves or tendons.All patients were followed up for 4 to 24 months (average,12 months).Follow-up by X-ray examination after 10 to 16 weeks revealed fracture union with no complications like screw breakage,nonunion,malunion or traumatic arthritis.Their AOFAS ankle-hindfoot scores at the final follow-up ranged from 80 to 98 points.Conclusion Preoperative three-dimensional reconstruction of talar posterior process fracture based on CT images using Mimics software can accurately determine the entry point and direction of screw insertion,yielding advantages of clear exposure,easy reduction and convenient screwing in the treatment of talar posterior process fracture through the posteromedial malleolar approach.
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Objective To evaluate the value of Materialise's interactive medical image control system (MIMICS) in the computer aided surgery, and to offer a reliable system for precise surgical planning and good effect of orthognathic surgery. Methods Based on CT images, geometric characteristics of 2 patients' head were collected for a 3D reconstruction of the human head. Skull, skin, and submucous tissue were reconstructed and optimized separately by MIMICS 10.01. Surgeries were simulated and the soft tissue deformation was predicted according to the surgical planning of experienced surgeons. Results Mesh of skull, skin and submucous tissue were constructed manually for 2 patients. Surgical procedures were simulated and the prediction of soft tissue deformation was realized by MIMICS, which could be visualized in any angle. Conclusion MIMICS is a helpful digital tool for computer aided surgery and the prediction of soft tissue deformation. MIMICS is also a 3D visualization system for orthognathic surgeries, by which surgeons could realize the surgical planning, revising,and the patient-doctor communication on the computer screen.