Sounds like one of these stats where they just invert the cause and effect to get a story; i.e. People who are healing better will obviously walk sooner. Inverted to people who walk sooner are healing better.
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There are some bigger studies coming out that show that early weight bearing is non-inferior to traditional protocols that ask for many weeks of NWB though, and given the obvious qol benefits of walking earlier it seems to me the standard should be mobilise ASAP.
There really isn't good evidence for immobilisation. It seems to be a hold over particularly for surgical fixation, where there's no real fear of displacing things if it's been fixated properly.