ABSTRACT
Compression of peripheral nerves may occur acutely or as part of a more chronic process. This may result in damage varying in severity. Mild compression is readily recognized and is experienced when sitting with the legs crossed, causing compression of the common peroneal nerve on the head of the fibula. The nerve trunk remains in continuity. Small and unmyelinated fibres are commonly involved. This type of damage is termed an axonotmesis. Repair is by regeneration over many months at the rate of 1–2 mm/day and may be incomplete. Nerve conduction studies will usually give important information about the pathogenesis of Root lesions and may demarcate the site of damage if there is a local conduction block. Acute traction or stretch injuries can sometimes produce severe nerve damage, as when the brachial plexus is injured by a motor cyclist landing forcefully on the shoulder.
