Strangely, I didn't see any increase in temperature when I broke my arm a few weeks ago. For various reasons (mainly logistics) it was over a week between breaking it and getting the surgery to put a plate and screws in. They did a good enough job on the repair that I didn't need a cast, just a big band-aid over the four-and-a-bit inch scar.
As you can imagine, I did take the opportunity to point a variety of thermal cameras at it, particularly once the band-aid was removed after a week, but nothing showed up.
Most hospitals here won't even let you see your X-Rays, let alone take an off-screen photo, so I was lucky to be able to get the one below. The bottle opener-shaped metalwork is 4" long and there are a lot of screws holding it all together. I traced over some of the fracture lines, which is why they're slightly pink. Now, about four weeks on, I'm regaining some of the strength and mobility of the wrist.
How did I do it? I was in a remote part of Scotland having fun exploring on my Segway. I was nearing maximum speed as I accelerated uphill when the battery cut out without warning. I went straight down, fast and hard, overstressing my arm in the process. No other serious damage, just a few bruises and scrapes. I was fortunate that although my spectacles hit the tarmac they didn't break. I then had to get the non-functional, 120lb Segway back to - and into - the car, with only one functioning arm. The other arm was a somewhat strange shape, thanks to the badly nadgered radius (which was in many pieces, impacted, and distorted). I then had to drive 2-1/2 hours to the nearest hospital. They didn't have the necessary stuff to fix it and neither did the regional hospital. I stayed a few more days then headed home - itself a two-day drive.
It could have been much, much worse: there might have been witnesses - or even, perish the thought, someone filming me...