Mechanisms of brachial plexus lesions

Area of Science:

• Neurology
• Orthopedic Surgery
• Trauma Surgery

Background:

• Brachial plexus palsies are often caused by significant physical trauma.
• Understanding the mechanism of injury is crucial for diagnosis and treatment.

Purpose of the Study:

• To elucidate the mechanisms leading to brachial plexus palsies.
• To correlate injury mechanisms with specific nerve damage locations.

Main Methods:

• Analysis of injury mechanisms including traction and direct impact.
• Correlation of observed nerve lesions with associated skeletal fractures and vascular injuries.

Main Results:

• Downward arm traction and shoulder-neck widening affect upper brachial plexus roots and trunks.
• Upward traction can cause avulsion of T1 and C8 nerve roots.
• Severe trauma can lead to lesions at all brachial plexus levels.
• Rupture of cords/nerves results from traction or scapulohumeral widening.
• Associated fractures (skull, spine, clavicle, rib) and vascular injuries indicate lesion site and severity.
• Direct impact/crush injuries in the supraclavicular region often involve clavicle fractures.

Conclusions:

• The mechanism of injury (traction vs. impact) dictates the location and type of brachial plexus lesion.
• Associated injuries provide vital clues to the extent and localization of brachial plexus damage.