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Can clinical signs identify newborns with neuromuscular disorders?
Isabella Vasta1, Maria Kinali, Sonia Messina
1Department of Paediatrics, Imperial College, Hammersmith Hospital, London, UK.
Insights
In newborns with hypotonia, severe muscle weakness and contractures are key indicators of neuromuscular disorders. Clinical signs like absent antigravity movements aid in early identification.
Area of Science:
- Neonatal Neurology
- Pediatric Neuromuscular Disorders
Background:
- Neonatal hypotonia is a common referral reason to tertiary care centers.
- Identifying the cause of neonatal hypotonia is crucial for timely intervention.
- Neuromuscular disorders are a significant differential diagnosis in hypotonic infants.
Purpose of the Study:
- To determine the prevalence of neuromuscular disorders in referred neonates.
- To assess the diagnostic utility of clinical signs in identifying these disorders.
Main Methods:
- Retrospective analysis of 83 newborns with hypotonia, weakness, or contractures.
- Evaluation of clinical signs such as antigravity movements and contractures.
- Correlation of clinical findings with confirmed diagnoses.
Main Results:
- A neuromuscular disorder was identified in 46.9% of infants with an identifiable disorder.
- Absent antigravity movements showed high sensitivity (97.4%) for neuromuscular disorders.
- Contractures were frequent in neuromuscular disorders but also present in genetic/metabolic syndromes.
Conclusions:
- Severe muscle weakness and contractures are strong indicators of neonatal neuromuscular disorders.
- Clinical assessment of antigravity movements and contractures is vital for diagnosis.
- Early identification aids in appropriate management of neonatal hypotonia.
Objective:
To evaluate retrospectively the prevalence of neuromuscular disorders in 83 newborns referred to a tertiary care center because of hypotonia and weakness and/or contractures, with a possible diagnosis of neuromuscular disorder. We also aimed to establish whether clinical signs could help to identify infants with neuromuscular disorders.
Study Design:
Sixty-six of the 83 infants who fulfilled the inclusion criteria (79.5%) had an identifiable disorder, which was a neuromuscular disorder in 39 (46.9%).
Results:
Absent or extremely reduced antigravity movements were mainly found in infants with neuromuscular disorders (sensitivity and specificity 97.4% and 75%), whereas partial range antigravity movements were more frequent in infants with other diagnosis. Contractures were mainly found in infants with peripheral nerve or muscle involvement but also were relatively frequent in infants with genetic or metabolic syndromes (sensitivity 69.2%, specificity 61.3%). Reduced fetal movements and abnormal liquor were frequent but not present consistently in infants with neuromuscular disorders (sensitivity 46.1% and 38.4%) and were found rarely in infants with other disorders (specificity 88.6% and 75.0%).
Conclusions:
Severe muscle weakness and contractures are the most reliable indicators of a neuromuscular disorder and should be carefully assessed in an infant with neonatal hypotonia.
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