Angus and David Graham, with the help of Bryan Tan, have published an article in the Journal of Hand Surgery regarding dissection of the posterior interosseous artery flap. There was previously little anatomical information on the specifics of the dissection, particularly relating to the anatomical relationships between the posterior interosseous artery and the nerve. Three areas of increasing risk to the nerve were identified as a method of stratifying risk during the dissection.
Thanks to all who helped out including the fantastic staff at the University of WA Anatomy department.
https://www.ncbi.nlm.nih.gov/pubmed/?term=keogh+posterior+interosseous