In context of running, one of the most discussed subjects over the last many years probably have been whether "Natural Running" will prevent injuries or actually be the source of injuries.
I have looked at the many, many references you can find on the web if you search for "natural running injuries" and to me it looks like you can easily confirm any initial views or assumptions no matter what you think of the subject.
With other words, it is extremely difficult to find objective investigation - let alone research - into this subject.
From discussions on my local running team, the general agreement seem to be that natural running is good for your legs in general - especially your shins, knees and hips - but it is bad when it comes to plantar fasciitis. Which kind of make sense to me, as your steps are shorter, but the archs under the feet must handle more pressure.
[As I have almost continuous problems with shin sprints, I wonder if I should try to switch. But I have also had some rather serious problems with PF in the past, which I really, really don't want to repeat..]
Thus the question: Are there any (conclusive) research in this field? Has anybody figured out if natural running is good, bad or just same-same?