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Perspective: cerebral palsy as a model of bone development in the absence of postnatal mechanical factors
K A Ward1, J M Caulton, J E Adams
1Clinical Radiology, Imaging Science and Biomedical Engineering, University of Manchester, Manchester, UK.
Insights
Mechanical loading is crucial for bone development. Children with cerebral palsy (CP) experience reduced mechanical loading, leading to fragile bones prone to fractures, necessitating targeted interventions.
Area of Science:
- Orthopedics
- Pediatrics
- Bone Biology
Background:
- Mechanical loading is essential for healthy skeletal development.
- Cerebral palsy (CP) significantly impacts skeletal development due to altered muscle function and reduced mechanical loading.
- Children with CP often exhibit poor bone status, termed 'physiologic osteopenia'.
Observation:
- Reduced mechanical loading in CP leads to the development of bone that cannot withstand daily activities.
- Fractures in children with CP can occur during simple daily tasks like dressing.
- Bone fragility is further exacerbated by increased bone resorption during immobilization periods post-fracture or surgery.
Findings:
- The poor bone status in CP is multifactorial, involving both mechanical and non-mechanical factors.
- Lack of normal muscular loading is the primary cause of compromised bone development in CP.
- Physical, nutritional, and pharmacological treatments show promise in increasing bone mineral density in CP patients.
Implications:
- Further clinical trials focusing on fracture prevention as a primary endpoint are crucial for this vulnerable pediatric population.
- Understanding the interplay of mechanical and non-mechanical factors is key to developing effective bone health strategies in CP.
- Interventions aimed at improving bone mineral density and reducing fracture risk are vital for enhancing the quality of life for children with CP.
Abstract:
To ensure optimal skeletal development, mechanical loading is imperative. The consequences of the removal of, or complete absence of, mechanical loading are illustrated by the clinical condition of cerebral palsy (CP). Clinical and radiological evaluation of children with CP provides an insight into how the growing skeleton develops when mechanical loading is reduced due to non-physiological muscle function. The poor bone status or "physiologic osteopenia" that these children suffer is multifactorial compromised of both mechanical and non-mechanical effects; primarily it is the lack of normal loading from the musculature which causes the development of a bone incapable of withstanding daily activities. Fractures occur during daily activities such as dressing and handling. Increased bone resorption during periods of immobilisation after fracture or surgery, also increases bone fragility. Trials of physical, nutritional and pharmacological treatments in CP children result in increased bone mineral density. Trials that include fracture prevention as the primary end point are required in this vulnerable group of children.
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