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Work and power in hemiplegic cerebral palsy gait
S J Olney1, H E MacPhail, D M Hedden
1School of Rehabilitation Therapy, Queen's University, Kingston, Ontario, Canada.
Insights
Children with spastic hemiplegia cerebral palsy showed altered muscle work during walking. Ankle muscles did less work, while hip muscles did more, impacting gait mechanics.
Area of Science:
- Biomechanics
- Pediatric Neurology
- Movement Science
Background:
- Cerebral palsy (CP) affects muscle function and movement.
- Spastic hemiplegia, a form of CP, impacts one side of the body.
- Understanding muscle work during walking is crucial for rehabilitation.
Purpose of the Study:
- To quantify muscle work in the affected limb of children with spastic hemiplegia during walking.
- To compare muscle work contributions to typical gait patterns.
Main Methods:
- Descriptive study design.
- Utilized cinematographic film and force-plate data.
- Applied a biomechanical link-segment model to calculate joint-level muscle work.
Main Results:
- Ankle plantar flexors generated approximately one-third of the positive work, significantly less than the typical two-thirds.
- Hip muscles performed the largest proportion of positive work in the affected limb.
- Abnormal distribution of work across joints was observed.
Conclusions:
- Muscle work patterns are significantly altered in children with spastic hemiplegia during walking.
- Hip muscles compensate for reduced ankle muscle contributions.
- Work and power analyses are valuable for treatment prescription and efficacy assessment in CP.
Abstract:
The purpose of this descriptive study was to quantify the work that is accomplished by major muscle groups of the affected limb of 10 children with spastic hemiplegia secondary to cerebral palsy during walking. Cinematographic film and force-plate data were used in a biomechanical link-segment model to calculate the positive and negative work performed by the muscles around each joint. The results revealed that the ankle plantar flexors produced just over a third of the positive work for the affected limb instead of the normal two thirds. The greatest proportion of positive work was performed by the hip muscles. More research using work and power analyses will assist in prescribing and determining the effectiveness of treatments.