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Knee adduction moment and medial contact force - facts about their correlation during gait

Knee adduction moment and medial contact force - facts about their correlation during gait
Knee adduction moment and medial contact force - facts about their correlation during gait
The external knee adduction moment is considered a surrogate measure for the medial tibiofemoral contact force and is commonly used to quantify the load reducing effect of orthopedic interventions. However, only limited and controversial data exist about the correlation between adduction moment and medial force. The objective of this study was to examine whether the adduction moment is indeed a strong predictor for the medial force by determining their correlation during gait. Instrumented knee implants with telemetric data transmission were used to measure tibiofemoral contact forces in nine subjects. Gait analyses were performed simultaneously to the joint load measurements. Skeletal kinematics, as well as the ground reaction forces and inertial parameters, were used as inputs in an inverse dynamics approach to calculate the external knee adduction moment. Linear regression analysis was used to analyze the correlation between adduction moment and medial force for the whole stance phase and separately for the early and late stance phase. Whereas only moderate correlations between adduction moment and medial force were observed throughout the whole stance phase (R(2)?=?0.56) and during the late stance phase (R(2)?=?0.51), a high correlation was observed at the early stance phase (R(2)?=?0.76). Furthermore, the adduction moment was highly correlated to the medial force ratio throughout the whole stance phase (R(2)?=?0.75). These results suggest that the adduction moment is a surrogate measure, well-suited to predicting the medial force ratio throughout the whole stance phase or medial force during the early stance phase. However, particularly during the late stance phase, moderate correlations and high inter-individual variations revealed that the predictive value of the adduction moment is limited. Further analyses are necessary to examine whether a combination of other kinematic, kinetic or neuromuscular factors may lead to a more reliable prediction of the force magnitude
1932-6203
e81036
Kutzner, Ines
78d5837f-7c5e-4477-b386-1bb6693e06c1
Trepczynski, Adam
76476dda-3d55-42d7-844d-566933e97a28
Heller, Markus O.
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Bergmann, Georg
9103a1c1-3bc2-4356-a274-8969fcb1e74b
Kutzner, Ines
78d5837f-7c5e-4477-b386-1bb6693e06c1
Trepczynski, Adam
76476dda-3d55-42d7-844d-566933e97a28
Heller, Markus O.
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Bergmann, Georg
9103a1c1-3bc2-4356-a274-8969fcb1e74b

Kutzner, Ines, Trepczynski, Adam, Heller, Markus O. and Bergmann, Georg (2013) Knee adduction moment and medial contact force - facts about their correlation during gait. PLoS ONE, 8 (12), e81036. (doi:10.1371/journal.pone.0081036). (PMID:24312522)

Record type: Article

Abstract

The external knee adduction moment is considered a surrogate measure for the medial tibiofemoral contact force and is commonly used to quantify the load reducing effect of orthopedic interventions. However, only limited and controversial data exist about the correlation between adduction moment and medial force. The objective of this study was to examine whether the adduction moment is indeed a strong predictor for the medial force by determining their correlation during gait. Instrumented knee implants with telemetric data transmission were used to measure tibiofemoral contact forces in nine subjects. Gait analyses were performed simultaneously to the joint load measurements. Skeletal kinematics, as well as the ground reaction forces and inertial parameters, were used as inputs in an inverse dynamics approach to calculate the external knee adduction moment. Linear regression analysis was used to analyze the correlation between adduction moment and medial force for the whole stance phase and separately for the early and late stance phase. Whereas only moderate correlations between adduction moment and medial force were observed throughout the whole stance phase (R(2)?=?0.56) and during the late stance phase (R(2)?=?0.51), a high correlation was observed at the early stance phase (R(2)?=?0.76). Furthermore, the adduction moment was highly correlated to the medial force ratio throughout the whole stance phase (R(2)?=?0.75). These results suggest that the adduction moment is a surrogate measure, well-suited to predicting the medial force ratio throughout the whole stance phase or medial force during the early stance phase. However, particularly during the late stance phase, moderate correlations and high inter-individual variations revealed that the predictive value of the adduction moment is limited. Further analyses are necessary to examine whether a combination of other kinematic, kinetic or neuromuscular factors may lead to a more reliable prediction of the force magnitude

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Published date: 2013
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 361505
URI: http://eprints.soton.ac.uk/id/eprint/361505
ISSN: 1932-6203
PURE UUID: 230a8407-2826-4d5c-92b4-fa5a005eeaa1
ORCID for Markus O. Heller: ORCID iD orcid.org/0000-0002-7879-1135

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Date deposited: 24 Jan 2014 14:33
Last modified: 15 Mar 2024 03:43

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Contributors

Author: Ines Kutzner
Author: Adam Trepczynski
Author: Georg Bergmann

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