Abstract：
:Theoretical concerns about the use of cemented or press-fit stems in revision total knee arthroplasty (TKA) include stress shielding with adverse effects on prosthesis fixation. Revision TKA components are commonly stemmed to protect the limited autogenous bone stock remaining. Revision procedures with the use of stems can place abnormal stresses through even normal bone by their constrained design, type of materials and fixation method and may contribute for bone loss. Experimental quantification of strain shielding in the proximal synthetic tibia following TKA is the main purpose of the present study. In this study, cortical bone strains were measured experimentally with tri-axial strain gauges in synthetic tibias before and after in vitro knee surgery. Three tibias were implanted with cemented and press-fit stem augments and solely with a tibial tray (short monobloc stem) of the P.F.C. Sigma Modular Knee System. The difference between principal strains of the implanted and the intact tibia was calculated for each strain gauge position. The results demonstrated a pronounced strain-shielding effect in the proximal level, close to tibial tray with the cemented stem augment. The press-fit stem presented a minor effect of strain shielding but was more extensively throughout the stem. An increase of strains closely to the distal tip of the cemented and the press-fit stem augment was observed. This suggests for a physiological condition, a potential effect of bone resorption at the proximal region for the cemented stem augment. The localized increase of strains in stems tip can be related with the clinical finding of the pain, at the end of stem after revision TKA.
journal_name
J Biomechjournal_title
Journal of biomechanicsauthors
Completo A,Fonseca F,Simões JAdoi
10.1016/j.jbiomech.2007.10.006subject
Has Abstractpub_date
2008-01-01 00:00:00pages
560-6issue
3eissn
0021-9290issn
1873-2380pii
S0021-9290(07)00451-4journal_volume
41pub_type
杂志文章abstract：:Elderly vertebrae frequently develop an "anterior wedge" deformity as a result of fracture and creep mechanisms. Injecting cement into a damaged vertebral body (vertebroplasty) is known to help restore its shape and stiffness. We now hypothesise that vertebroplasty is also effective in reducing subsequent creep deform...
journal_title：Journal of biomechanics
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journal_title：Journal of biomechanics
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doi：10.1016/0021-9290(90)90303-k
更新日期：1990-01-01 00:00:00
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abstract：:Data on articular cartilage thickness in the living are important for the design for computer models, aimed at preoperatively assessing the effect of surgical procedures on joint contact and load transmission, and for the calculation of cartilage material properties from its deformational behavior as determined during...
journal_title：Journal of biomechanics
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abstract：:Intersegmental forces and moments (i.e. resultant free body forces and moments computed at the joint centers) were studied in canine hindlimbs before and after cemented total hip replacement (THR). Five large, adult, mixed-breed dogs were selected. Their gait was recorded (while leash-walked) before surgery using high...
journal_title：Journal of biomechanics
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doi：10.1016/0021-9290(91)90028-l
更新日期：1991-01-01 00:00:00
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journal_title：Journal of biomechanics
pub_type： 杂志文章
doi：10.1016/j.jbiomech.2014.03.006
更新日期：2014-05-07 00:00:00
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doi：10.1016/j.jbiomech.2004.09.008
更新日期：2005-10-01 00:00:00
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pub_type： 杂志文章
doi：10.1016/j.jbiomech.2008.06.007
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pub_type： 杂志文章
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journal_title：Journal of biomechanics
pub_type： 杂志文章
doi：10.1016/j.jbiomech.2010.10.015
更新日期：2011-01-11 00:00:00
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pub_type： 杂志文章
doi：10.1016/j.jbiomech.2008.05.028
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journal_title：Journal of biomechanics
pub_type： 杂志文章
doi：10.1016/j.jbiomech.2007.11.012
更新日期：2008-01-01 00:00:00
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pub_type： 杂志文章
doi：10.1016/0021-9290(94)00129-r
更新日期：1995-07-01 00:00:00
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journal_title：Journal of biomechanics
pub_type： 杂志文章
doi：10.1016/0021-9290(95)00083-6
更新日期：1996-04-01 00:00:00
abstract：:Although micromechanical finite-element models are being increasingly used to help interpret the results of bio-mechanical tests, there has not yet been a systematic study of the numerical errors and uncertainties that occur with these methods. In this work, finite-element models of human L1 vertebra have been used to...
journal_title：Journal of biomechanics
pub_type： 杂志文章
doi：10.1016/s0021-9290(98)00108-0
更新日期：1998-10-01 00:00:00
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journal_title：Journal of biomechanics
pub_type： 杂志文章
doi：10.1016/j.jbiomech.2008.01.007
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abstract：:The purpose of this study was to examine the age-related predictive and feedback adaptive locomotor improvements in the components of dynamic stability control during disturbed walking. Thirteen old (62-74 yrs) and ten young (23-30 yrs) male subjects performed a gait protocol on a gangway, which included one covered e...
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pub_type： 杂志文章
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abstract：:The use of a finite element based computational method, RFEM3D, is described for the study of strain-induced bone remodeling. The purpose of the research is to find the potential influence on the predictions of surface bone remodeling when various models for the maturation of newly deposited bone are used. A parameter...
journal_title：Journal of biomechanics
pub_type： 杂志文章
doi：10.1016/0021-9290(90)90015-u
更新日期：1990-01-01 00:00:00
abstract：:A new strain energy function for the hyperelastic modelling of ligaments and tendons based on the geometrical arrangement of their fibrils is derived. The distribution of the crimp angles of the fibrils is used to determine the stress-strain response of a single fascicle, and this stress-strain response is used to det...
journal_title：Journal of biomechanics
pub_type： 杂志文章
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更新日期：2011-01-04 00:00:00
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journal_title：Journal of biomechanics
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更新日期：2017-08-16 00:00:00
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journal_title：Journal of biomechanics
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doi：10.1016/j.jbiomech.2009.07.014
更新日期：2009-11-13 00:00:00
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journal_title：Journal of biomechanics
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更新日期：2009-10-16 00:00:00
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journal_title：Journal of biomechanics
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doi：10.1016/j.jbiomech.2009.11.003
更新日期：2010-03-22 00:00:00
abstract：:Pulsatile tinnitus (PT), characterized as pulse-synchronous, is generally objective. Sigmoid sinus (SS) venous sound is widely suggested to be a possible sound source of PT. The dehiscence and thinness of SS cortical plate (CP) was commonly reported as PT pathology in previous studies, but lack quantitative or biomech...
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更新日期：2019-02-14 00:00:00
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journal_title：Journal of biomechanics
pub_type： 杂志文章
doi：10.1016/j.jbiomech.2009.04.032
更新日期：2009-08-07 00:00:00
abstract：:Understanding microstructural changes that occur in skin subjected to repetitive mechanical stress is crucial towards the development of therapies to enhance skin adaptation and load tolerance in patients at risk of skin breakdown (e.g. prosthesis users, wheelchair users). To determine if collagen fibril diameter, col...
journal_title：Journal of biomechanics
pub_type： 杂志文章
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更新日期：2001-12-01 00:00:00
abstract：:A computer-controlled mechanical culture system was designed to investigate the interaction between mechanical stimuli and the metabolism of articular cartilage. The main features of this system include the following capabilities: (1) Accurately controlled static, permanent cyclic or intermittent cyclic mechanical loa...
journal_title：Journal of biomechanics
pub_type： 杂志文章
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更新日期：1997-08-01 00:00:00
