Assessing the performance envelop of TKR using subject specific loads during stair ascent
Assessing the performance envelop of TKR using subject specific loads during stair ascent
The short and long term performance of total knee replacements are
dependent on the mechanical environment of the joint. In particular,
excessive polyethylene stresses and abnormal kinematics are likely to
accelerate the wear process. In vivo fluoroscopy studies have reported
highly variable kinematics for a given activity [1,2]. Total knee designs
are likely to be subjected to a wide range of loading conditions in vivo.
Morrison [3] and Costigan et al. [4] conducted gait kinematics and kinetic
studies and obtained a range of force values within a group of individuals.
For example, in Morrison’s study, the maximum knee joint reaction force
during level gait was in the range of 2 – 4 times body weight. The
majority of pre-clinical finite element studies only model idealized
loading patterns, typically based on the ISO loading data of knee wear
simulators. Tan et al. [5] examined the performance envelope during level
gait by applying subject forces to an explicit FE model of a TKR. The
study showed for that particular TKR the kinematics were relatively
insensitive to subject specific loads, but the polyethylene stresses showed
great variability. Other activities, for example stair ascent, are more
demanding for TKR and therefore may produce larger variations in
kinematics and polyethylene stresses than observed during level gait.
Hence, the aim of this study was to assess the performance envelope of a
TKR design when subjected to subjects’ specific loads for stair ascent.
Tan, K.H.
d1d689a8-cf28-4669-8493-b3f8fc704882
Costigan, P.
c41722b1-16ab-4eac-b2e1-9d8b1ecaf4b5
Taylor, M.
e368bda3-6ca5-4178-80e9-41a689badeeb
2004
Tan, K.H.
d1d689a8-cf28-4669-8493-b3f8fc704882
Costigan, P.
c41722b1-16ab-4eac-b2e1-9d8b1ecaf4b5
Taylor, M.
e368bda3-6ca5-4178-80e9-41a689badeeb
Tan, K.H., Costigan, P. and Taylor, M.
(2004)
Assessing the performance envelop of TKR using subject specific loads during stair ascent.
Transactions of the Annual Meeting - Orthopaedic Research Society, 29.
Abstract
The short and long term performance of total knee replacements are
dependent on the mechanical environment of the joint. In particular,
excessive polyethylene stresses and abnormal kinematics are likely to
accelerate the wear process. In vivo fluoroscopy studies have reported
highly variable kinematics for a given activity [1,2]. Total knee designs
are likely to be subjected to a wide range of loading conditions in vivo.
Morrison [3] and Costigan et al. [4] conducted gait kinematics and kinetic
studies and obtained a range of force values within a group of individuals.
For example, in Morrison’s study, the maximum knee joint reaction force
during level gait was in the range of 2 – 4 times body weight. The
majority of pre-clinical finite element studies only model idealized
loading patterns, typically based on the ISO loading data of knee wear
simulators. Tan et al. [5] examined the performance envelope during level
gait by applying subject forces to an explicit FE model of a TKR. The
study showed for that particular TKR the kinematics were relatively
insensitive to subject specific loads, but the polyethylene stresses showed
great variability. Other activities, for example stair ascent, are more
demanding for TKR and therefore may produce larger variations in
kinematics and polyethylene stresses than observed during level gait.
Hence, the aim of this study was to assess the performance envelope of a
TKR design when subjected to subjects’ specific loads for stair ascent.
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Published date: 2004
Additional Information:
50th Annual Meeting of the Orthopaedic Research Society, San Francisco, USA, 2004. Poster No: 1034
Identifiers
Local EPrints ID: 23025
URI: http://eprints.soton.ac.uk/id/eprint/23025
ISSN: 0149-6433
PURE UUID: a2f6d288-1978-47bf-8346-60858dd3b442
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Date deposited: 08 Mar 2007
Last modified: 11 Dec 2021 14:42
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Contributors
Author:
K.H. Tan
Author:
P. Costigan
Author:
M. Taylor
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