Tool For Sprains or Broken Bones
There is a heat meter that chiropractors use to check for damage with heat. You could devise a tool that can tell you, based on heat output from joints or bones, to check to see how bad your sprain is or if the bone is broken and needs treatment. It would have a gauge from no sprain at all to sever break. Labeled and colored to show that particular problem and that would tell you how bad the damage is.