I read a lot of posts on here of people suffering with leg injuries of one type or another. May I make a suggestion, its good advice not to run in the same shoes on consecutive runs. OK, I'm obsessive, I have 7 pairs of running shoes and never use the same pair twice, I have been very lucky maybe, but I have not suffered with any injury or anything more than an ache after a run, I put this down to never running in the same pair the next run, I rotate them. Running is my only real hobby, so like any hobby I spend on it, I might be wrong, but I I put it down to changing my shoes regularly how I've managed to stay injury free, I run 4 times per week and complete a 9 mile circuit, walking 5 miles of running 4. I run on the moors, gravel tracks, bridleways, so it cant be the surface. For those incurring injuries, google it and you will see its good advice.
Best of luck.