Journal ArticleDOI
Stair climbing is more critical than walking in pre-clinical assessment of primary stability in cementless THA in vitro
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TLDR
Pre-clinical in vitro tests of hip endoprostheses should simulate stair climbing and include muscle activity in the assessment of initial implant stability, otherwise micro-movements may be underestimated and the primary stability overestimated.About:
This article is published in Journal of Biomechanics.The article was published on 2005-05-01. It has received 97 citations till now. The article focuses on the topics: Stair climbing & Contact force.read more
Citations
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Journal ArticleDOI
Realistic loads for testing hip implants
Georg Bergmann,Friedmar Graichen,Antonius Rohlmann,Alwina Bender,B. Heinlein,Georg N. Duda,Markus O. Heller,Michael M. Morlock +7 more
TL;DR: Real load conditions for hip implants are defined, based on in vivo contact force measurements, and it is shown that at least for heavyweight and very active subjects, the real load conditions are more critical than those defined by the ISO standards for fatigue tests.
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Finite element modelling of primary hip stem stability: the effect of interference fit.
TL;DR: A finite element model was constructed to predict micromotion and, therefore, instability of femoral stems and it was predicted that the optimal level of interference fit is around 50 microm as this is sufficient to achieve good primary fixation while having a safety factor of 2 against femoral canal fracture.
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Probabilistic finite element analysis of the uncemented hip replacement--effect of femur characteristics and implant design geometry
TL;DR: It was demonstrated that results from a single model study should not be generalised to the entire population of femurs and that bone variability is an important factor that should be investigated in such analyses.
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A portable system for collecting anatomical joint angles during stair ascent: a comparison with an optical tracking device
TL;DR: These highly portable body-worn inertial sensors can be used by clinicians and researchers alike, to accurately collect data during stair climbing in complex real-life situations, and are a satisfactory system for measuring anatomical joint angles.
Journal ArticleDOI
Biomechanics of a short stem: In vitro primary stability and stress shielding of a conservative cementless hip stem
TL;DR: In this in vitro study, primary stability and stress shielding of a new cementless short stem implant was evaluated in comparison to a straight stem using nine pairs of human cadaver femurs to predict bone‐implant performance.
References
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Journal ArticleDOI
Hip contact forces and gait patterns from routine activities.
Georg Bergmann,Georg Deuretzbacher,Markus O. Heller,Friedmar Graichen,Antonius Rohlmann,J Strauss,Georg N. Duda +6 more
TL;DR: The paper focuses on the loading of the femoral implant component but complete data are additionally stored on an associated compact disc that contains complete gait and hip contact force data as well as calculated muscle activities during walking and stair climbing and the frequencies of daily activities observed in hip patients.
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Hip joint loading during walking and running, measured in two patients
TL;DR: In one hip in the first patient and in the second patient the direction of large forces approximated the average anteversion of the natural femur, so the joint loading was observed over the first 30 and 18 months, respectively, following implantation.
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Observations on the effect of movement on bone ingrowth into porous-surfaced implants
TL;DR: Experimentally, bone ingrowth can occur in the presence of some movement, albeit very small (up to 28 μ), while excess movement can result in attachment by mature connective tissue ingrowth.
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Mechanical validation of whole bone composite femur models
TL;DR: It seems that the composite tibias are suitable to replace cadaveric specimens for certain types of test, whereas they might be unsuitable for others, depending on the loading regimen.
Journal Article
Prognosis of total hip replacement in Sweden: follow-up of 92,675 operations performed .
TL;DR: A prospective, national multi-center study of all reoperations after total hip replacement (THR) was started by the Swedish Orthopedic Association in 1979 as discussed by the authors, with the Charnley prosthesis as the gold standard.