I tore my rotator cuff and labrum, and I was struck by the fact that tendons and cartilage do not self-repair. That is, if you break your clavicle, a bone, it will find the other broken part, and glue itself back together. If you tear your rotator cuff tendon, it will never reattach to the bone without surgery. Same for ligaments and cartilage.
Thus, if you observed what bones do, you might come up with a rule: broken things in the body need rest, and they will repair themselves. But if you looked deeper, you would see that doesn't always hold. Those tissues without blood supplies have no way to 'reattach', because they have no sensors, they don't know they are broke.
Broken bones can heal in 6-8 weeks, but tear your ACL and it's 6-months before you can run again.
Arthroscopic surgery is one of the great surgical advances. Thirty years ago you would have had to have either major surgery -- slicing through muscles, assuming they could even diagnose the problem -- or it would have been left alone, with ongoing pain and restricted range of motion for the rest of your life.
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