It’s a fine hypothesis to suspect that turf causes more injuries than grass but answering that question by looking at where teams play their home games is the wrong approach. You’ll get a much clearer picture by recording where each injury happened.

One of the big issues with your take is that there are confounding factors such as:

• Are teams that play home games on turf better adjusted to it?
• How many division rivals (where a lot of road games are played) have grass vs turf?