why do knee ligament injuries don’t heal by itself? eli5
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Ligaments and tendons are tough and have very little blood flow. This means they heal slowly. A ligament also functions to hold a joint in place or to limit movement. If a ligament tears or is severed, it has no chance of healing to the point that it can sustain nominal loads unless the injured tissue is surgically relocated to maximize the chance that it heals according to its nominal anatomy.
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