Rini Dharmastiti

Three Dimensional Morphometry of Distal Femur to Design Knee Prosthesis for Indonesian Population

El objetivo fue disenar una protesis a medida para una determinada poblacion, por tanto la morfometria debia ser medida para proporcionar datos basicos para disenar el tamano ideal de una protesis total para la artroplastia de rodilla en poblacion de Indonesia. Se realizo un estudio antropometrico sobre 100 sujetos sanos indonesios, basados en tomografias computadorizadas (TC) de la superficie resecada del femur distal. Los parametros que se midieron fueron longitud femoral mediolateral (FML), longitud femoral anteroposterior (FAP), longitud femoral medial anteroposterior (FMAP), longitud femoral lateral anteroposterior (FLAP), y razon de aspecto femoral (FR). Las medias FAP y FML fueron 54,60±5,71 y 65,98±6,51, respectivamente. La morfometria del femur distal fue significativamente diferente entre hombres y mujeres (mayor tamano en hombres), sin embargo uno de los parametros mostro resultados diferentes, la FLAP. Las personas indonesias son de menor tamano en comparacion con su contraparte occidental. Las dimensiones propuestas se pueden utilizar como los datos basicos para disenar el tamano ideal para una protesis de rodilla a medida para la poblacion de Indonesia.

Three Dimensional Morphometry of Proximal Femur to Design Best-Fit Femoral Stem for Indonesian Population

Para disenar protesis a medida en una poblacion determinada, la morfometria necesita ser conocida. El objetivo de este estudio fue obtener resultados que sean utiles en la investigacion para disenar el tamano ideal de una protesis total de artroplastia de cadera para la poblacion de Indonesia. Fue realizado un estudio antropometrico en 100 sujetos sanos de raza mongoloide de Indonesia, en los que se estudio la parte proximal del femur por tomografia computadorizada (TC). Se consideraron como parametros la cabeza del femur (CF), posicion de la cabeza del femur (PCF), diametro de la cabeza del femur (DCF), angulo cervicodiafisario (ACD), ancho anteroposterior (AAP) y ancho-lateral en 3 lugares diferentes. La poblacion Indonesia tiene una morfometria menor del femur proximal en comparacion con la poblacion occidental. El valor medio de todos los parametros en hombres fueron mayores a las mujeres. Por otra parte, CF y PCF mostraron diferencia significativa entre hombres y mujeres e indico una ubicacion superior del centro de la cabeza del femur en hombres, en comparacion con las mujeres. Se encontro que la dimension del canal femoral fue mediolateral oval, 1,43, 1,28, y 1,34, en 3 cortes diferentes, respectivamente (20 mm superior y 40 mm inferior del trocanter menor e istmo). La dimension del femur proximal en la poblacion de Indonesia es de menor tamano en comparacion con la contraparte occidental. Las dimensiones propuestas se pueden utilizar como datos basicos para el diseno de un tamano ideal de vastago femoral para la poblacion Indonesia.

Pin on flat wear volume prediction of UHMWPE against cp Ti for orthopedic applications

Tribological assessment of orthopedic biomaterials requires a lot of testing time. Researchers must test the biomaterials in millions of cycles at low frequency (1 Hz) to mimic the in vivo conditions. It is a problem because product designs and developments could not wait longer for wear data to predict the lifetime of their products. The problem can be solved with the use of computation techniques to model the wear phenomena and provide predicted data. The aim of this research is to predict the wear volume of the commonly used ultra high molecular weight polyethylene (UHMWPE) sliding against commercially pure titanium (cp Ti) in the unidirectional pin on flat tests. The 9 mm diameter UHMWPE pin and cp Ti plate contact mechanics were modeled using Abaqus. Contact pressure was set at 3 MPa. Outputs of the computations (contact pressure and contact area) were used to calculate the wear volume with Archard law. A custom Python script was made to automate the process. The results were then compared with experimental data for validations. The predicted data were in a good trend with numerical errors from 0.3% up to 26%.

Sex Differences and Emotion in Wayfinding: Using a Map or Verbal Direction (a Pilot Study)

Objective The current investigation examined gender differences and emotion in wayfinding behavior. Background Looking for a new location or moving from one place to another place is a common everyday task. The ability to find one’s way in our complex environments represents one of the most fundamental cognitif function. Methods Using survey method in collecting data, this study has 262 students from three universities in Central Java-Indonesia. Age between 17 and 22 years old. Descriptive statistics were used. Results Wayfinding behavior dominantly used map and verbal direction almost equally, even on men and women too. There were no positif, neutral, or negatif emotion dominantly effect on wayfinding behavior. Further results are discussed.

Effect of dengue virus infection on the permeability of vero cells line

Vero cell line is widely used in many in vitro studies including dengue infection studies. Recent study explore the increase of permeability of vero cell line due to infection dengue virus serotype 2. Vero cell line (CCL-81, ATCC) cultured in the transwell polyester permeable membrane and infected by dengue virus-2. Culture media containing albumin was used to assess the transvero albumin permeability. The content of albumin migrates across the vero cells was determined using protein assay dye reagent and BSA standard (5 and 10 µg/μl), and then measured by microplate reader. The results indicate that dengue infection increases the permeability of vero cells with significant value compared to the control, especially at two days and more post infection. The result of the study suggests that vero cell line can be used as model cells in the permeability studies of infection of dengue virus serotype 2.