eli5: How do tendons RE-attach to bone post-surgery?

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I found other posts about how tendons attach to bone. However, as someone who recently underwent rotator cuff surgery to fix a completely torn tendons, I am curious as to what triggers the tendons to re-attach to the bone (re-bind to the bone if you will)? in my case, I know I have plastic anchors that will eventually desolve or be absorbed by the body. Does the surgeon apply some sort of glue? How does the body trigger the re-attachment process, after the tendons has been seperated from the bone for months?

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