The causation of posterior interosseous nerve compression is the compression of the nerve as it dives deep in the Arcade of Frohse, an arch of fibrous tissue which is also called the radial tunnel.

Morphological variations of the suprascapular notch and its clinical correlation with suprascapular nerve entrapment syndrome, Indian Journal of Clinical Anatomy and Physiology, 10, 3, (157-161 ...

The radial nerve passes just below the bony bit on the outside of the elbow (lateral epicondyle). The symptoms of this injury are very similar to those of tennis elbow.