Rapid responses are electronic letters to the editor. They enable our users to debate issues raised in articles published on thebmj.com. Although a selection of rapid responses will be included online and in print as readers' letters, their first appearance online means that they are published articles. If you need the url (web address) of an individual response, perhaps for citation purposes, simply click on the response headline and copy the url from the browser window. Letters are indexed in PubMed.
This was a good question with interesting and informative answers, EXCEPT that the reproduction in the printed BMJ was such poor quality that it was only the on-line version demonstrated the abnormality.
But more important, this x-ray did nor have the side, R or L marked on it. I believe the BMJ should be promoting good and safe practice, and should not accept contributions which fall below these standards.