Author's Accepted Manuscript
Effect of step width manipulation on tibial stress during running Stacey A. Meardon, Timothy R. Derrick
www.elsevier.com/locate/jbiomech
PII: DOI: Reference:
S0021-9290(14)00274-7 http://dx.doi.org/10.1016/j.jbiomech.2014.04.047 BM6648
To appear in:
Journal of Biomechanics
Accepted date: 28 April 2014 Cite this article as: Stacey A. Meardon, Timothy R. Derrick, Effect of step width manipulation on tibial stress during running, Journal of Biomechanics, http://dx. doi.org/10.1016/j.jbiomech.2014.04.047 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
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EFFECT OF STEP WIDTH MANIPULATION ON TIBIAL STRESS DURING RUNNING Stacey A. Meardon1 and Timothy R. Derrick2 1
East Carolina University Department of Physical Therapy 2410D Health Sciences Building Greenville, NC 27834 252-744-6248 Fax: 252-737-6240 [email protected] 2
Iowa State University Department of Kinesiology 249 Forker Building Ames, IA 50011 (515) 294-8438 Fax: (515) 294-7802 [email protected] Key words: stress fracture, medial tibial stress syndrome, injury, locomotion, running technique
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1 2
EFFECT OF STEP WIDTH MANIPULATION ON TIBIAL STRESS DURING RUNNING
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Abstract
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Narrow step width has been linked to variables associated with tibial stress fracture.
5
The purpose of this study was to evaluate the effect of step width on bone stresses using a
6
standardized model of the tibia. 15 runners ran at their preferred 5k running velocity in three
7
running conditions, preferred step width (PSW) and PSW ± 5% of leg length. 10 successful
8
trials of force and 3-D motion data were collected. A combination of inverse dynamics,
9
musculoskeletal modeling and beam theory was used to estimate stresses applied to the tibia
10
using subject-specific anthropometrics and motion data. The tibia was modeled as a hollow
11
ellipse. Multivariate analysis revealed that tibial stresses at the distal 1/3 of the tibia differed
12
with step width manipulation (p=0.002). Compression on the posterior and medial aspect of
13
the tibia was inversely related to step width such that as step width increased, compression on
14
the surface of tibia decreased (linear trend p=0.036 and 0.003, respectively). Similarly,
15
tension on the anterior surface of the tibia decreased as step width increased (linear trend
16
p=0.029). Widening step width linearly reduced shear stress at all 4 sites (p
Effect of step width manipulation on tibial stress during running Stacey A. Meardon, Timothy R. Derrick
www.elsevier.com/locate/jbiomech
PII: DOI: Reference:
S0021-9290(14)00274-7 http://dx.doi.org/10.1016/j.jbiomech.2014.04.047 BM6648
To appear in:
Journal of Biomechanics
Accepted date: 28 April 2014 Cite this article as: Stacey A. Meardon, Timothy R. Derrick, Effect of step width manipulation on tibial stress during running, Journal of Biomechanics, http://dx. doi.org/10.1016/j.jbiomech.2014.04.047 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
1
EFFECT OF STEP WIDTH MANIPULATION ON TIBIAL STRESS DURING RUNNING Stacey A. Meardon1 and Timothy R. Derrick2 1
East Carolina University Department of Physical Therapy 2410D Health Sciences Building Greenville, NC 27834 252-744-6248 Fax: 252-737-6240 [email protected] 2
Iowa State University Department of Kinesiology 249 Forker Building Ames, IA 50011 (515) 294-8438 Fax: (515) 294-7802 [email protected] Key words: stress fracture, medial tibial stress syndrome, injury, locomotion, running technique
2
1 2
EFFECT OF STEP WIDTH MANIPULATION ON TIBIAL STRESS DURING RUNNING
3
Abstract
4
Narrow step width has been linked to variables associated with tibial stress fracture.
5
The purpose of this study was to evaluate the effect of step width on bone stresses using a
6
standardized model of the tibia. 15 runners ran at their preferred 5k running velocity in three
7
running conditions, preferred step width (PSW) and PSW ± 5% of leg length. 10 successful
8
trials of force and 3-D motion data were collected. A combination of inverse dynamics,
9
musculoskeletal modeling and beam theory was used to estimate stresses applied to the tibia
10
using subject-specific anthropometrics and motion data. The tibia was modeled as a hollow
11
ellipse. Multivariate analysis revealed that tibial stresses at the distal 1/3 of the tibia differed
12
with step width manipulation (p=0.002). Compression on the posterior and medial aspect of
13
the tibia was inversely related to step width such that as step width increased, compression on
14
the surface of tibia decreased (linear trend p=0.036 and 0.003, respectively). Similarly,
15
tension on the anterior surface of the tibia decreased as step width increased (linear trend
16
p=0.029). Widening step width linearly reduced shear stress at all 4 sites (p
