Mechanisms of increased passive compliance of hamstring muscle-tendon units after spinal cord injury

Diong, J; Herbert, RD; Kwah, LK; Clarke, JL; Harvey, LA

Mechanisms of increased passive compliance of hamstring muscle-tendon units after spinal cord injury

Diong, J Herbert, RD Kwah, LK

Clarke, JL Harvey, LA

Permalink

Publication Type:: Journal Article
Citation:: Clinical Biomechanics, 2012, 27 (9), pp. 893 - 898
Issue Date:: 2012-11-01

Closed Access

	Filename	Description	Size
	Diong Clin Biomech (2012) Passive mech properties of HS.pdf	Published Version	600.37 kB	Adobe PDF	View/Open

Copyright Clearance Process

Recently Added
In Progress
Closed Access

This item is closed access and not available.

Full metadata record

Field	Value	Language
dc.contributor.author	Diong, J	en_US
dc.contributor.author	Herbert, RD	en_US
dc.contributor.author	Kwah, LK https://orcid.org/0000-0002-9809-9859	en_US
dc.contributor.author	Clarke, JL	en_US
dc.contributor.author	Harvey, LA	en_US
dc.date.available	2012-07-09	en_US
dc.date.issued	2012-11-01	en_US
dc.identifier.citation	Clinical Biomechanics, 2012, 27 (9), pp. 893 - 898	en_US
dc.identifier.issn	0268-0033	en_US
dc.identifier.uri	http://hdl.handle.net/10453/43219
dc.description.abstract	Background: People with spinal cord injury sometimes develop abnormally compliant hamstring muscle-tendon units. This study investigated whether the increased muscle-tendon compliance is due to a change in the passive properties of the muscle fascicles or tendons, or to muscle tears. Methods: Semimembranosus muscle fascicle lengths were measured from ultrasound images obtained from 15 spinal cord injured subjects and 20 control subjects while the hip was passively flexed with the knee extended. Semimembranosus muscles of spinal cord injured subjects were inspected for tears using ultrasound imaging. Findings: The mean (SD) hip angle at 30 Nm was 97 (SD 24) degrees in spinal cord injured subjects and 70 (SD 11) degrees in control subjects, indicating that spinal cord injured subjects had very compliant hamstring muscle-tendon units. The ratio of change in fascicle length to change in muscle-tendon length was not statistically different between spinal cord injured subjects and control subjects: muscle fascicles lengthened by 0.30 (SD 0.24) mm/mm in spinal cord injured subjects and 0.42 (SD 0.29) mm/mm in control subjects. These data were used to show that there was evidence of increased tendon compliance of spinal cord injured subjects compared to control subjects, but no evidence of increased muscle fascicle compliance. No tears were observed in semimembranosus muscles of spinal cord injured subjects. Interpretation: The increased hamstring muscle-tendon compliance apparent in some spinal cord injured subjects is due, at least in part, to increased tendon compliance. There was no evidence that the increased muscle-tendon compliance was due to muscle tears.	en_US
dc.relation.ispartof	Clinical Biomechanics	en_US
dc.relation.isbasedon	10.1016/j.clinbiomech.2012.07.003	en_US
dc.subject.classification	Orthopedics	en_US
dc.subject.mesh	Leg	en_US
dc.subject.mesh	Muscle, Skeletal	en_US
dc.subject.mesh	Tendons	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Spinal Cord Injuries	en_US
dc.subject.mesh	Stress, Mechanical	en_US
dc.subject.mesh	Models, Biological	en_US
dc.subject.mesh	Computer Simulation	en_US
dc.subject.mesh	Adult	en_US
dc.subject.mesh	Female	en_US
dc.subject.mesh	Elastic Modulus	en_US
dc.subject.mesh	Ultrasonography	en_US
dc.title	Mechanisms of increased passive compliance of hamstring muscle-tendon units after spinal cord injury	en_US
dc.type	Journal Article
utslib.citation.volume	9	en_US
utslib.citation.volume	27	en_US
utslib.for	1106 Human Movement and Sports Sciences	en_US
utslib.for	090305 Rehabilitation Engineering	en_US
utslib.for	111602 Human Biophysics	en_US
utslib.for	0903 Biomedical Engineering	en_US
utslib.for	0913 Mechanical Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Graduate School of Health
utslib.copyright.status	closed_access
pubs.issue	9	en_US
pubs.publication-status	Published	en_US
pubs.volume	27	en_US

Abstract:

Background: People with spinal cord injury sometimes develop abnormally compliant hamstring muscle-tendon units. This study investigated whether the increased muscle-tendon compliance is due to a change in the passive properties of the muscle fascicles or tendons, or to muscle tears. Methods: Semimembranosus muscle fascicle lengths were measured from ultrasound images obtained from 15 spinal cord injured subjects and 20 control subjects while the hip was passively flexed with the knee extended. Semimembranosus muscles of spinal cord injured subjects were inspected for tears using ultrasound imaging. Findings: The mean (SD) hip angle at 30 Nm was 97 (SD 24) degrees in spinal cord injured subjects and 70 (SD 11) degrees in control subjects, indicating that spinal cord injured subjects had very compliant hamstring muscle-tendon units. The ratio of change in fascicle length to change in muscle-tendon length was not statistically different between spinal cord injured subjects and control subjects: muscle fascicles lengthened by 0.30 (SD 0.24) mm/mm in spinal cord injured subjects and 0.42 (SD 0.29) mm/mm in control subjects. These data were used to show that there was evidence of increased tendon compliance of spinal cord injured subjects compared to control subjects, but no evidence of increased muscle fascicle compliance. No tears were observed in semimembranosus muscles of spinal cord injured subjects. Interpretation: The increased hamstring muscle-tendon compliance apparent in some spinal cord injured subjects is due, at least in part, to increased tendon compliance. There was no evidence that the increased muscle-tendon compliance was due to muscle tears.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/43219