Are the pitches causing injuries?

Before the World Cup had started there was a lot of talk about the quality of the facilities and if they would be ready for the tournament. The pitches themselves were discussed at length as to how they would affect teams in terms of style of play and so on, but what about injuries, are the pitches having a big influence on the amount we are seeing?

The condition of the Manaus pitch, 2 days before  the World Cup

It has been evident throughout the tournament that nearly every pitch is in poor condition, which you would expect would make it easier for players to injure their ankles in almost any movement in the game. However, this isn't something that we have seen much of, or at least isn't an injury that is ruling players out of further matches, in fact the only player who has been so far is Daniel Opare of Ghana. This would suggest that the pitches are in good condition, right? Not necessarily. In fact Jose Mourinho, the current Chelsea manager, has had a bit of a rant about the quality of them because of the effect it has having on performances, but he also hasn't mentioned injuries.

What we are seeing is a large amount of hamstring and thigh strains so far, common injuries in football. I recall the USA striker Jozy Altidore picked up a hamstring strain when sprinting after a through ball in their first game.
What you will learn at UOB is that these strains are caused by over-stretching when completing explosive movements with poor coordination, such as sprinting or striking the ball, and could occur at any time. Obviously this can be applied to all sports, not just football.

Jozy Altidore of the USA suffers a hamstring injury against Ghana

I would personally say that I don't think the pitches are really affecting the amount of injuries that are occurring, they are just affecting the quality of matches as they are not in pristine condition. Like I've said previously, the individual player injuries (at the time of writing) back this up, although I guess it could be argued that these are just recorded injuries.