Ok while we are at football injury stories:
I played football with a couple of friends 3 weeks ago. My best friend good a blow on his right leg right under the knee on the muscle during a normal battle. Nothing serious. At least we thought so. It was just a blow so we thought he'd just get a bruise and he kept playing. Though the pain wouldn't leave after 2 days, his whole leg started to swell and and he couldn't lift or partly even feel his foot. So his girlfriend and me said you go to hospital now and get that checked.
Thank god we did.
He had an compartment syndrome, doctors started to panic when they checked the pressure on his muscle which was around 95 and should be 25. They instant cut his whole leg open from knee to ankle to save it. Later they said if he'd have came in an hour later they'd have needed to amputate his leg from the knee down.
From such shit. It's impossible that it happens just like that from such a little blow