from years of following mma and talking to different fighters i dont think any fighter ever enters the cage 100% injury free, i remember tito telling me when he fought wanderlie in japan for the ufc lhw title that his foot was fractured. these guys have to train so hard day in and day out that they are gonna be hurt going into a fight, the severity of the injuries can be anything from just plain old banged up toes or fingers to alot worse things like ribs, neck or back injuries. i did hear andersons ribs where banged up before he fought sonnen also, as far as i heard both fighters dont seem to have any major sprains or injuries going into this fight so it should be a great one.