Seems fairly rare to hear of someone having a knee, etc that bothers them for years provided it’s been properly treated. But hear about “bad backs” that people fight for decades.
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It’s a consequence of evolution. A lot of people like to think that humanity is the pinnacle of evolution, that somehow humanity is an inevitable consequence of the diversity of life. This is not the case. Backs are a perfect example of why.
Way back when, a good few million years ago before the first human was born, our genetic predecessors were here. They walked in a manner similar to modern monkeys and gorillas, so their spine tended to be much more horizontal. We walk upright, but our backs haven’t quite yet caught up. So, problems tend to occur with our backs a lot more frequently than other parts of our body; our backs aren’t designed to do what we want them to do.
So, to answer your question, bad backs happen because evolution shafted us. But, on the bright side, no other species gets to enjoy some good rigatoni.
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