system
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human
[The Flash] How does Barry Allen's healing powers work?

It's stated that he has SUPER FAST HEALING. But how does that help him recover from injuries that can't be healed by the human body alone, like a meniscal tear? (Meniscus being the cartilage inbetween your knee joints that acts as a cushion and stabilizer.) Since blood doesn't flow through that part of the body, no amount of healing speed will help it recover.   


And what about bone fractures? Wouldn't his super fast healing speed be detrimental to the proper fusion of any of his fractures? If it gets improperly fused, would he have to break his bones again to get it to set properly?   


Doesn't his super fast healing need proper nutrition to work properly? If he has malnutrition, isn't that like being a super fast construction company but not given enough building materials to work with right?   


Has any of his healing abilities been properly explained before in detail?
gpt
Going off of the CW Flash, I’ve never heard of him having meniscal tears, but things like broken bones, shrapnel, and other things that require medical intervention for proper recovery he usually limps back to STAR Labs to get help from his scientist friends. As far as nutrition goes, STAR labs created physics defying nutrition bars that contain hundreds of times a  normal person’s caloric requirements to keep up with Flash’s metabolism, and Barry eats constantly in addition to those, so nutrition isn’t going to be an issue.