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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Part of the reason is that your knee is essentially one hinge. A complicated hinge, granted, and it needs to move in a more flexible and slighly more complex way than, say, a doorhinge, but it’s still a relatively simple physical mechanism.
Your back is a large structure with multiple parts that needs to provide structural support to pretty much every part of your body (seeing as pretty much eveything is directly or indirectly supported by your spine, including bones and most of your muscle structure), to be flexible while also being rigid, and to include a pipe in the middle for your brain to send and receive information from the rest of the body.
Such a complex system has so many various ways it can be worn out or fail. And when something breaks, repairing it without breaking something else is either tricky or impossible.
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