Broken Tibia plate concerns

Hello,

I broke my left Tibia bone on the 15th last week and I have a few concerns on recovery.
Well to begin, I am feeling better, however I am unable to fully extend my leg out and my range of motion in my ankle is limited. I had the surgery and they ended up cutting just above my ankle and sliding a plate with a couple screws to fix it. Is my range of motion limited due to the plate that was slid inside or could it be just muscle damage from where my leg struck? Broke my Tibia in two playing soccer too close to a metal pole that was sticking out of the ground.

please and thanks for your responses.