| Mechanical properties of the plantarflexor musculotendinous unit during passive dorsiflexion in children with cerebral palsy compared with typically developing children. | |
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MedLine Citation:
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PMID: 20132139 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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AIM: To examine the passive length-tension relations in the myotendinous components of the plantarflexor muscles of children with and without cerebral palsy (CP) under conditions excluding reflex muscle contraction. METHOD: A cross-sectional, non-interventional study was conducted in a hospital outpatient clinic. Passive torque-angle characteristics of the ankle were quantified from full plantarflexion to full available dorsiflexion in 26 independently ambulant children with CP (11 females, 15 males; mean age: 6 y 11 mo, range 4 y 7 mo-9 y 7 mo) and 26 age-matched typically developing children (18 females, 8 males; mean age 7 y 2 mo, range 4 y 1 mo-10 y 4 mo). In the children with CP, the affected (hemiplegia; n=21) or more affected (diplegia; n=5) leg was tested; in typically developing children, the leg tested was randomly selected. Gross Motor Function Classification System levels were I (n=15) and II (n=11). Care was taken to eliminate active or reflex muscle contribution to the movement, confirmed by the absence of electromyographic activity. RESULTS: There were small but significant differences between the two groups for maximum ankle dorsiflexion (p=0.003), but large and significant differences in the torques required to produce the same displacement (p<0.001). Further, the hysteresis of the average loading cycle in the children with CP was over three times that of the typically developing children (p<0.001). INTERPRETATION: We believe that the plantarflexor muscles of children with CP are stiffer and intrinsically more resistant to stretch, even though they retain near normal excursion. This increased stiffness is a non-neurally-mediated feature demonstrated by these children. The extent to which it influences function and predisposes the children to development of soft tissue contracture is unknown. |
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Authors:
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Adel A A Alhusaini; Jack Crosbie; Roberta B Shepherd; Catherine M Dean; Adam Scheinberg |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-01-28 |
Journal Detail:
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Title: Developmental medicine and child neurology Volume: 52 ISSN: 1469-8749 ISO Abbreviation: Dev Med Child Neurol Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-06-23 Completed Date: 2010-07-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0006761 Medline TA: Dev Med Child Neurol Country: England |
Other Details:
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Languages: eng Pagination: e101-6 Citation Subset: IM |
Affiliation:
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Department of Rehabilitation Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Kingdom of Saudi Arabia. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Ankle
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physiopathology* Biomechanics Cerebral Palsy / physiopathology* Child Child, Preschool Cross-Sectional Studies Disability Evaluation Elasticity Electromyography Female Humans Male Muscle, Skeletal / physiopathology* Prospective Studies |
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