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  • 1
    Electronic Resource
    Electronic Resource
    Amphiphile induced echinocyte-spheroechinocyte transformation of red blood cell shape (1998)
    Springer
    European biophysics journal 27 (1998), S. 335-339 
    Details
    ISSN: 1432-1017
    Keywords: Key words Red blood cell ; Spheroechinocyte ; Membrane skeleton ; Cell shape ; Elastic energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract A possible physical explanation of the echinocyte-spheroechinocyte red blood cell (RBC) shape transformation induced by the intercalation of amphiphilic molecules into the outer layer of the RBC plasma membrane bilayer is given. The stable RBC shape is determined by the minimization of the membrane elastic energy, consisting of the bilayer bending energy, the bilayer relative stretching energy and the skeleton shear elastic energy. It is shown that for a given relative cell volume the calculated number of echinocyte spicula increases while their size decreases as the number of the intercalated amphiphilic molecules in the outer layer of the cell membrane bilayer is increased, which is in agreement with experimental observations. Further, it is shown that the equilibrium difference between the outer and the inner membrane leaflet areas of the stable RBC shapes increases if the amount of the intercalated amphiphiles is increased, thereby verifying theoretically the original bilayer couple hypothesis of Sheetz and Singer (1974) and Evans (1974).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002490050140
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of the femoral and pelvic geometrical parameters that are important for the hip joint contact stress: Differences between female and male (1996)
    Springer
    Pflügers Archiv 431 (1996), S. R207 
    Details
    ISSN: 1432-2013
    Keywords: hip joint ; pelvic shape ; pelvic parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The difference between male and female femoral and pelvic geometry was studied by considering some geometrical parameters such as interhip distance, inclination of the crista iliaca, diameter of the femoral head and centre-edge angle of Wiberg. The values of these parameters were determined for 79 healthy female and 21 healthy male subjects. Standard anterior-posterior radiographs were used and processed by the computer-aided system. The results show some important sex differences in femoral and pelvic geometrical parameters which determine the hip joint contact stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02346341
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Stress distribution on the hip joint articular surface during gait (1996)
    Springer
    Pflügers Archiv 431 (1996), S. R275 
    Details
    ISSN: 1432-2013
    Keywords: gait ; hip joint ; resultant hip joint force ; stress distribution ; articular surface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The magnitude and the direction of the resultant hip joint force are different in different body positions during gait. Therefore the stress distribution in the hip joint articular surface also changes. The aim of this work is to study how the stress distribution changes if the magnitude and the direction of the hip joint force is changed during gait. For this purpose a three-dimensional mathe-matical model is developed. We calculated the values of the peak stress and the location of the pole on the articular surface (where the stress is maximal) in the successive phases of the walking cycle. The values of the peak stress range from 0.8 MPa in the one limb stance phase to 2.6 MPa in the heel strike phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02346375
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Biomechanical analysis of various operative hip joint rotation center shifts (1993)
    Springer
    Archives of orthopaedic and trauma surgery 112 (1993), S. 124-126 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A mathematical model was used to evaluate the mechanical situation after various operative shifts of the hip joint rotation center. It was concluded that while performing different pelvic osteotomies and the total hip replacement the hip joint rotation center should be shifted as far medially as is technically possible to reduce the magnitude of the hip joint contact force. By contrast, lateralization of the hip joint rotation center strongly increases the magnitude of the hip joint contact force; therefore this should be avoided whenever possible. The superior shift of the hip joint rotation center decreases the strength of the patient's hip abductor muscles and must therefore also be avoided. The inferior shift of the hip joint rotation center is favorable because it increases the strength of the patient's hip abductor muscles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00449986
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Increased incidence of arthrosis in women could be related to femoral and pelvic shape (1997)
    Springer
    Archives of orthopaedic and trauma surgery 116 (1997), S. 345-347 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this study various femoral and pelvic geometrical parameters important for hip joint contact stress were determined. The parameters were measured from standard anteroposterior radiographs of healthy adult subjects and analysed by using descriptive statistical procedures. Women proved to have a significantly smaller femoral head radius and larger distance between the inner acetabular rims than men, both features which lead to an increase of contact stress in the hip joint articular surface. Since too high, long-lasting contact stress is unfavourable regarding the development of arthrosis, we propose that these differences in the femoral and pelvic geometry could be one of the reasons for the increased incidence of arthrosis in women.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00433987
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Biomechanical study of various greater trochanter positions (1995)
    Springer
    Archives of orthopaedic and trauma surgery 114 (1995), S. 76-78 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A mathematical model was used in order to evaluate the mechanical situation after lateral, medial, distal and proximal displacements of the greater trochanter. It was calculated that lateral displacement may considerably reduce the hip joint contact force, while medial displacement greatly increases it. The influence of proximalization and distalization is much less pronounced. It was further shown that, regarding the postoperative relative hip abductor muscle strength, lateral and distal displacements of the greater trochanter are favourable, while proximal and medial displacements are not.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00422829
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Increased incidence of arthrosis in women could be related to femoral and pelvic shape (1997)
    Springer
    Archives of orthopaedic and trauma surgery 116 (1997), S. 345-347 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this study various femoral and pelvic geometrical parameters important for hip joint contact stress were determined. The parameters were measured from standard anteroposterior radiographs of healthy adult subjects and analysed by using descriptive statistical procedures. Women proved to have a significantly smaller femoral head radius and larger distance between the inner acetabular rims than men, both features which lead to an increase of contact stress in the hip joint articular surface. Since too high, long-lasting contact stress is unfavourable regarding the development of arthrosis, we propose that these differences in the femoral and pelvic geometry could be one of the reasons for the increased incidence of arthrosis in women.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050135
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    Paper (German National Licenses)
    Fulltext
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