Hip contact forces and gait patterns from routine activities

Bergmann, G.; Deuretzbacher, G.; Heller, Markus O.; Graichen, F.; Rohlmann, A.; Strauss, Jeffrey D.; Duda, Georg N.

doi:10.1016/s0021-9290(01)00040-9

Cited by 1,935 publications

(1,575 citation statements)

References 22 publications

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“…anterior-posterior and medial-lateral (Bergmann et al, 2001)) are applied to a reference point located at the centre of the femoral head being coupled to a surface area on the top of the head (see Figure 2b and d). This area was found from the area of wear damage at the bearing surface on the majority of the retrieved femoral heads (see Figure 2 e and f).…”

Section: Finite Element Wear Analysismentioning

confidence: 99%

“…When measured, this worn area was found to be around 35° away from the central axis of the head while the head and stem are assembled at 45° from the vertical axis (see Figure 2d). The rotations (flexions-extension, internal-external and adduction-abduction (Bergmann et al, 2001)) are applied to another reference point, again located at the centre of the head and coupled to the stem, which constrains the model so that it can only rotate about the centre of the head and virtually locates the head in the acetabular cup (see Figure 2b and d). These loading and boundary conditions create an efficient and realistic model by excluding the requirement to model the acetabular cup and femur bone.…”

Section: Finite Element Wear Analysismentioning

confidence: 99%

See 1 more Smart Citation

A large taper mismatch is one of the key factors behind high wear rates and failure at the taper junction of total hip replacements: A finite element wear analysis

Ashkanfar

Langton

Joyce

2017

Journal of the Mechanical Behavior of Biomedical Materials

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A large taper mismatch is one of the key factors behind high wear rates and failure at the taper junction of total hip replacements: A finite element wear analysis.http://researchonline.ljmu.ac.uk/5442/ Article LJMU has developed LJMU Research Online for users to access the research output of the University more effectively. Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Users may download and/or print one copy of any article(s) in LJMU Research Online to facilitate their private study or for non-commercial research. You may not engage in further distribution of the material or use it for any profit-making activities or any commercial gain.The version presented here may differ from the published version or from the version of the record. Please see the repository URL above for details on accessing the published version and note that access may require a subscription. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Chromium femoral heads, which had been in service for 5.1 years in average, to validate the FE analyses. It was found that a large taper mismatch (e.g. 9.12´ ) results in a high wear rate (2.960mm 3 per million load cycles). Such wear rates can have a major negative effect on the clinical outcomes of these implants. It was also found that even a slight reduction in mismatch significantly reduced the magnitude of the wear rates (0.069mm 3 per million load cycles on average for 6´ taper mismatch). It is recommended that the cone angles of femoral head and femoral trunnion should be manufactured to produce a taper mismatch of less than 6´ at the taper junction.

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Section: Finite Element Wear Analysismentioning

confidence: 99%

Section: Finite Element Wear Analysismentioning

confidence: 99%

A large taper mismatch is one of the key factors behind high wear rates and failure at the taper junction of total hip replacements: A finite element wear analysis

Ashkanfar

Langton

Joyce

2017

Journal of the Mechanical Behavior of Biomedical Materials

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“…The external moments must be balanced by internal moments, which are created by muscle and soft tissue and contact forces. Assuming antagonistic muscle activity does not change, an increase in the external moments is interpreted as increased joint loading, whereas a reduction would represent decreased joint loading [4].…”

Section: Introductionmentioning

confidence: 99%

Dynamic loads are determinants of peak bone mass

Moisio

Hurwitz

Sumner

2004

Journal Orthopaedic Research

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This study investigated the association between non‐invasive measurements of bone mass and markers of dynamic and static hip joint loads in subjects expected to be at peak bone mass. The bone mineral density (BMD) and bone mineral content (BMC) of three proximal femoral sites (neck, greater trochanter, and total) were measured by dual energy X‐ray absorptiometry, and the peak external joint moments at the hip during walking and jogging were calculated from gait analyses of 31 normal human subjects ranging in age from 30 to 49 years (18 females, 13 males). Various multiple regression analyses were performed to determine how much of the variance in BMD and BMC was explained by height, body mass, and the peak hip joint moments. In total, the models explained up to 40% of the variance in BMD and 58% of the variance in BMC. Inclusion of height or body mass did not increase the explanatory power of the models for BMD and explained no more than 8% of the total variance in BMC once the joint moments from walking were allowed to enter the models. These data support the hypothesis that variance in peak bone mass is associated with variance in dynamic hip loads largely independent of the effect of static factors such as height and body mass. © 2003 Orthopaedic Research Society. Published by Elsevier Ltd. All rights reserved.

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“…The radiographs were taken to ensure the correct placement of the tip of the helical blade at subchondral area and the measurement of the tip apex distances (TAD) was recorded [Figures 2a–d]. Specimens were shortened at the shaft to a total length of 19 cm, plotted in a specially designed frame at 25° adduction in the coronal plane and neutral in the sagittal plane to simulate one-legged stance 20. Then the specimens were stored at –20°C until mechanical testing was performed.…”

Section: Methodsmentioning

confidence: 99%

A biomechanical evaluation of proximal femoral nail antirotation with respect to helical blade position in femoral head: A cadaveric study

Hwang

Garg²,

et al. 2012

IJOO

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Objective:Despite new developments in the management of osteoporotic fractures, complications like screw cutout are still found in the fixation of proximal femur fractures even with biomechanically proven better implants like proximal femoral nail antirotation (PFNA). The purpose of this cadaveric study was to investigate the biomechanical stability of this device in relation to two common positions (center-center and inferior-center) of the helical blade in the femoral head in unstable trochanteric fractures.Materials and Methods:Eight pairs of human cadaveric femurs were used; in one group [center-center (C-C) group], the helical blade of PFNA was fixed randomly in central position both in anteroposterior and lateral view, whereas in the other group it was fixed in inferior one-third position in anteroposterior and in central position in lateral view [inferior-center (I-C) group]. Unstable intertrochanteric fracture was created and each specimen was loaded cyclically till load to failureResults:Angular and rotational displacements were significantly higher within the C-C group compared to the I-C group in both unloaded and loaded condition. Loading to failure was higher in the I-C group compared to the C-C group. No statistical significance was found for this parameter. Correlations between tip apex distance, cyclic loading which lead to femoral head displacement, and ultimate load to failure showed a significant positive relationship.Conclusion:The I-C group was superior to the C-C group and provided better biomechanical stability for angular and rotational displacement. This study would be a stimulus for further experimental studies with larger number specimens and complex loading protocols at multicentres.

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Hip contact forces and gait patterns from routine activities

Cited by 1,935 publications

References 22 publications

A large taper mismatch is one of the key factors behind high wear rates and failure at the taper junction of total hip replacements: A finite element wear analysis

A large taper mismatch is one of the key factors behind high wear rates and failure at the taper junction of total hip replacements: A finite element wear analysis

Dynamic loads are determinants of peak bone mass

A biomechanical evaluation of proximal femoral nail antirotation with respect to helical blade position in femoral head: A cadaveric study

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