Showing papers by "Veronika Kralj-Iglič published in 2001"
TL;DR: In this paper, a simple statistical approach is used, where the particles in the solution are distributed over a lattice with an adjustable lattice constant, and different sizes of ions are described by different values of the lattice constants.
221 citations
TL;DR: A variety of distinct experimental and numerical approaches lead to estimates of contact stresses and surprisingly, despite the choice of technique, values for peak contact stresses lie within a range of one order of magnitude.
Abstract: Contact stresses in the hip articular surfaces relate in some way to normal maintenance as well as destruction of joints. In vivo determinations of cartilage-on-cartilage contact pressure histories...
46 citations
TL;DR: The vesicles appearing as composed of a mother sphere and a thin tubular myelin-like protrusion, are found to be a common phase in the spontaneous slow shape transformation that yields giant fluctuating phospholipid vesicle of different shapes.
41 citations
TL;DR: It is demonstrated how the maximal stress on the hip joint weight bearing area is determined from the presented nomograms for a hip for which the geometrical parameters were obtained from a standard anteroposterior rentgenograph.
37 citations
TL;DR: It is found that the centre-edge angle increases on average during the follow-up time in the operated hips as well as in the contralateral nonoperated hips, but the average increase is smaller in the former.
Abstract: The biomechanical state of the hip after a Salter innominate osteotomy was investigated by using the radiographic data of 38 operated and 21 contralateral nonoperated hips from our archives. The centre-edge angle of Wiberg was determined from the radiographs taken shortly after the operation. From the radiographs of the latest follow-up (7-13 years after the operation), we also determined the peak value of contact hip joint stress normalized by the body weight, and the functional angle of the weight-bearing area. A mathematical model was used. We show that the geometrical parameters aside from the centre-edge angle may considerably influence the contact hip stress distribution. We also show that the functional angle of the weight-bearing area is a more relevant parameter than the normalized peak stress if the exact magnification of the images is not known and if there is considerable variation of the image size within the sample. The development of the centre-edge angle of the operated hips and of the contralateral hips was also studied. We found that the centre-edge angle increases on average during the follow-up time in the operated hips as well as in the contralateral nonoperated hips, but the average increase is smaller in the former. It is shown that an unfavorable stress distribution is connected to the decrease of the centre-edge angle over time. Finally, we found a weak positive correlation between the centre-edge angle shortly after the operation and the functional angle of the weight-bearing area at the of the latest follow-up.
29 citations
TL;DR: In this paper, the authors determined contact stress on the articular surface of the hip joint in a group of patients who underwent operative treatment for severe slipped capital femoral epiphysis.
Abstract: We determined contact stress on the articular surface of the hip joint in a group of patients who underwent operative treatment for severe slipped capital femoral epiphysis Two different procedures were considered: the modified osteotomy of Dunn-Fish and the osteotomy of Imhauser In order to determine the stress distribution, a three-dimensional mathematical model was used taking into account the geometrical parameters of the pelvis and hip, which were measured from standard antero-posterior radiographs We found that the Dunn-Fish procedure produced lower peak stress than the Imhauser procedure
22 citations
Journal Article•
TL;DR: How a positive charge character of Triton X-100 and C12E8 can explain their hitherto mysterious stomatocytogenic shape altering effect in human erythrocytes is described.
Abstract: We report literature data indicating that the polyoxyethylene chain of polyoxyethylene detergents attracts cations via dipole-ion interactions thereby attaining a positive charge character. This implies that nonionic polyoxyethylene detergents like Triton X-100 and C12E8 may interact electrostatically with phospholipid head groups. We describe how a positive charge character of Triton X-100 and C12E8 can explain their hitherto mysterious stomatocytogenic shape altering effect in human erythrocytes.
20 citations
TL;DR: The formation of tethers may be energetically favorable due to the quadrupolar ordering of the anisotropic membrane constituents in the strong curvature field of the tethers as discussed by the authors.
17 citations
TL;DR: It is suggested that the effect of the microtubular rod on the cell shape can be theoretically well described by taking into account some basic conditions for the mechanical equilibrium of the cell cortical shell and the appropriate geometrical constraints.
10 citations
Journal Article•
TL;DR: It is shown theoretically in this work that anisotropic C12E8 membrane inclusions may stabilize circular hole in a flat membrane segment.
Abstract: It was observed recently that nonionic surfactant octaethyleneglycol dodecylether (Cl2E8) decreases threshold for irreversible electroporation in membrane bilayers. In accordance, it is shown theoretically in this work that anisotropic C12E8 membrane inclusions may stabilize circular hole in a flat membrane segment.
3 citations