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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Imagine a creature walking on all fours. They’re like a bridge. Now make that half circle stand upright. You’ll have to brake the back. And then bend it back a little. Now the lower back is curved in. And the upper back just wants to slouch forward. You just made an S-shape from basically a C-shape.
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