Our first catchup post is the most recent That’s a Fact video, Back Trouble. The vertebrate spine originally appeared in aquatic animals, and has had a number of different roles aside from being the central supporting column in the human skeleton. The story runs that due to the processes that evolution follows – that it can do little more than modify what already exists rather than completely redesign an organism from the ground up – the human spine is not quite the structure that would have been created had it been designed specifically for that purpose. This narrative, which I’m sure you’ve all heard, at least partially blames human back pain on this effect.
I can’t tell you to what extent that’s true or not. It’s probably true that a good portion of the back troubles experienced by modern humans comes not from the fact that the spine is not designed for bipedalism, but that it isn’t designed for bipeds with lousy posture. However, an upright orientation for the spine just gives it a whole plethora of new ways to get injured. The ICR video, of course, argues against the evolutionary explanation – one thing I can tell you is that they did a poor job of it: Continue reading