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The effect of height, weight and head circumference on gross motor development in achondroplasia
Penelope Jane Ireland1, Robert S Ware, Samantha Donaghey
1Queensland Paediatric Rehabilitation Service, Royal Children's Hospital, Brisbane, Queensland, Australia. penny_ireland@health.qld.gov.au
Insights
Children with achondroplasia (a form of dwarfism) generally experience delayed gross motor skills. However, individual differences in height, weight, or head size did not significantly impact milestone timing before age five, except for the sit transition.
Area of Science:
- Pediatric physical therapy
- Developmental pediatrics
- Skeletal dysplasias
Background:
- Achondroplasia is a common form of dwarfism characterized by specific skeletal abnormalities.
- Gross motor milestone acquisition is crucial for overall child development.
- Children with achondroplasia often exhibit delays in motor development.
Purpose of the Study:
- To examine the association between physical measurements (height, weight, head circumference) and gross motor milestone acquisition in children with achondroplasia.
- To identify if anthropometric factors influence the timing of motor skill development in this population.
Main Methods:
- A population-based cohort study involving 48 children with achondroplasia.
- Data collected on gross motor milestones up to 5 years of age.
- Correlations analyzed between milestones and anthropometric data (height, weight, head circumference) at birth and 12 months.
Main Results:
- Overall delayed gross motor skill acquisition was observed in the cohort.
- Individual variations in height, weight, and head circumference did not significantly affect most gross motor milestones before age five.
- The transition from lying to sitting was influenced by 12-month measurements: earlier with greater height/weight, later with head-to-body disproportion.
Conclusions:
- This study is the first to link musculoskeletal factors in achondroplasia with gross motor development timing.
- Identifying factors that worsen lying-to-sitting transition delays is key for proactive clinical interventions.
- Findings can guide clinicians in providing targeted advice and support for motor skill acquisition in children with achondroplasia.
Purpose:
This study aimed to investigate whether height, weight, head circumference and/or relationships between these factors are associated with gross motor milestone acquisition in children with achondroplasia.
Method:
Population-based data regarding timing of major gross motor milestones up to 5 years were correlated with height, weight and head circumference at birth and 12 months in 48 children with achondroplasia born in Australia and New Zealand between 2000 and 2009.
Results:
Although as a group children with achondroplasia showed delayed gross motor skill acquisition, within group differences in height, weight or head circumference did not appear to influence timing of gross motor skills before 5 years. The exception was lie to sit transitioning, which appears likely to occur earlier if the child is taller and heavier at 12 months, and later if the child has significant head-to-body disproportion.
Conclusions:
This is the first study to investigate the relationship between common musculoskeletal impairments associated with achondroplasia and timing of gross motor achievement. Identification of the musculoskeletal factors that exacerbate delays in transitioning from lying to sitting will assist clinicians to provide more proactive assessment, advice and intervention regarding motor skill acquisition for this population.
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