dc.contributor.author
Damm, Philipp
dc.contributor.author
Bender, Alwina
dc.contributor.author
Bergmann, Georg
dc.date.accessioned
2018-06-08T10:37:54Z
dc.date.available
2015-05-07T07:09:23.003Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/20784
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-24083
dc.description.abstract
Loosening of the artificial cup and inlay is the most common reasons for total
hip replacement failures. Polyethylene wear and aseptic loosening are frequent
reasons. Furthermore, over the past few decades, the population of patients
receiving total hip replacements has become younger and more active. Hence, a
higher level of activity may include an increased risk of implant loosening as
a result of friction-induced wear. In this study, an instrumented hip implant
was used to measure the contact forces and friction moments in vivo during
walking. Subsequently, the three-dimensional coefficient of friction in vivo
was calculated over the whole gait cycle. Measurements were collected from ten
subjects at several time points between three and twelve months postoperative.
No significant change in the average resultant contact force was observed
between three and twelve months postoperative. In contrast, a significant
decrease of up to 47% was observed in the friction moment. The coefficient of
friction also decreased over postoperative time on average. These changes may
be caused by ‘running-in’ effects of the gliding components or by the improved
lubricating properties of the synovia. Because the walking velocity and
contact forces were found to be nearly constant during the observed period,
the decrease in friction moment suggests an increase in fluid viscosity. The
peak values of the contact force individually varied by 32%-44%. The friction
moment individually differed much more, by 110%-129% at three and up to 451%
at twelve months postoperative. The maximum coefficient of friction showed the
highest individual variability, about 100% at three and up to 914% at twelve
months after surgery. These individual variations in the friction parameters
were most likely due to different ‘running-in’ effects that were influenced by
the individual activity levels and synovia properties.
en
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject.ddc
600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit
dc.title
Postoperative Changes in In Vivo Measured Friction in Total Hip Joint
Prosthesis during Walking
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation
PLoS ONE. - 10 (2015), 3, Artikel Nr. e0120438
dcterms.bibliographicCitation.doi
10.1371/journal.pone.0120438
dcterms.bibliographicCitation.url
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0120438
refubium.affiliation
Charité - Universitätsmedizin Berlin
de
refubium.mycore.fudocsId
FUDOCS_document_000000022385
refubium.note.author
Der Artikel wurde in einer Open-Access-Zeitschrift publiziert.
refubium.resourceType.isindependentpub
no
refubium.mycore.derivateId
FUDOCS_derivate_000000004879
dcterms.accessRights.openaire
open access