We missed this article published in the Telegraph a couple of weeks ago. Dalrymple says there is little correlation between the all-too-real pain of back problems and objective medical evidence of such problems:

This, of course, makes backache the more or less perfect condition for malingerers, or those who would defraud insurance companies. This has long been recognised. When railways were still comparatively new, passengers involved in accidents or abrupt halts claimed to suffer from “railway spine”…

To this day private detectives are probably better at discerning the truth than radiographers.