Key result
Historical observations and experimental work suggest that peripheral brachial paralysis in infants is primarily caused by traction on and rupture of the upper roots of the brachial plexus.
Provides a historical perspective on the etiology of obstetrical brachial plexus paralysis.
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Endorses traction on upper roots as primary mechanism; leaves open validation with modern imaging and cohorts.
J. E. Morison (1938) conducted a review in Peripheral brachial paralysis. Historical observations and experimental work suggest that peripheral brachial paralysis in infants is primarily caused by traction on and rupture of the upper roots of the brachial plexus.
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