It's a little weird but it didn't irk me at all. The back thing was a stretch but it worked with the theme of the film so it didn't bother me much either.
Less of stretch than in knightfall where Bruce's back is healed by a woman with psycho-kinetic powers.
And IIRC it wasn't a full break as Barman twisted just as Bane smashed him down but there was severe spinal trauma.
So some of these "plot holes" are in line with source materials.