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The Bone & Joint Journal

General Orthopaedics
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The Journal of Bone & Joint Surgery British Volume
Vol. 84-B, Issue 5 | Pages 740 - 743
1 Jul 2002
Becker MH Lassner F Bahm J Ingianni G Pallua N

Controversy surrounds the aetiology of obstetric brachial plexus lesions. Most authors consider that it is caused by traction or compression of the brachial plexus during delivery. Some patients, however, present without a history of major traction during delivery, and some delivered by Caesarean section also suffer the injury.

In our series of 42 infants, 28 had an Erb’s palsy, and the remaining 14 presented with a more extensive lesion, involving the lower roots. In five of these, a complete ossified cervical rib was found.

We believe that anatomical variations, such as cervical ribs or fibrous bands, can cause narrowing of the supracostoclavicular space, and render the adjacent nerves more susceptible to external trauma.