In July 2012 my mother fractured her lower leg. She was at least 18 stone at the time and is now a bit bigger. She refuses to walk anywhere other than the bare minimum and is very out of breath if she does (even just going up the stairs.) She says she won't walk further as her leg still hurts, although she won't see anyone about it, but I am guessing that her size is a big issue (which will also explain why she won't see anyone about it still hurting) rather than 'the NHS are only interested in fixing bones, but there is a lot of other stuff that can cause problems for a long time afterwards.'
NB: I know it's not really any of my business and I can't tell her anything she isn't privately aware of, I just wanted to see if anyone who knows more about breakages can shed a bit of light