why would we check for the radial nerve in someone who has injured the shoulder
1 Is due to compression of the lower part of the brachial plexus. 2  As this is really a brachial plexus injury, the median and ulnar nerves may also be involved. 3  It may also be compressed by the use of shoulder crutches. 4  Nerve function usually fully recovers within a few weeks. At the elbow: 2  The radial nerve may be entrapped at the elbow at a number of sites but the most common is the proximal border of the tendon of supinator called the arcade of Frohse. 3  Check for tenderness over the radial tunnel.