It's the Terrible Too's More than the Shoes

From The Science of Sport

"Shoes, running technique and so forth are factors in injuries, yes, but the only factor that is KNOWN to cause injury is training too long, too hard, too soon (or combinations of the three)....training is key and any runner who trains at the right level for their history and circumstances (this is where strength, flexibility, stability come into it), will not get injured."