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Morphologic variants of acromion in neonatal cadavers
Journal of Pediatric Orthopedics
|September 1, 1995
Summary
Hooked-type acromions, linked to rotator cuff issues in adults, are rare in newborns. This suggests that acromion shape may not be a primary congenital cause of rotator cuff lesions.
Area of Science:
- Orthopedic Surgery
- Anatomy
- Developmental Biology
Background:
- The morphology of the acromion, particularly the hooked-type (Bigliani and Morrison type III), is implicated in adult rotator cuff lesions.
- A congenital predisposition for rotator cuff pathology based on acromion type is often assumed.
Purpose of the Study:
- To investigate the incidence of different acromion morphologies in neonatal cadavers.
- To evaluate the relationship between neonatal acromion types and the presumed congenital risk for rotator cuff lesions.
Main Methods:
- Morphological analysis of acromion types in a series of neonatal cadavers.
- Classification of acromions based on the Bigliani and Morrison system.
Main Results:
- Hooked-type (type III) acromions were observed in only 5% of the neonatal specimens.
- The low incidence of type III acromions in neonates contrasts with their higher prevalence in adult rotator cuff lesion populations.
Conclusions:
- The findings challenge the hypothesis that specific acromion types present from birth are a significant congenital risk factor for rotator cuff tears.
- Acquired factors or later developmental changes may play a more critical role in the pathogenesis of rotator cuff lesions associated with acromion morphology.