A race between two runners is often used as an analogy to describe the mechanism of endochondral ossification. Review endochondral ossification. In endochondral ossification, who are the two runners? Did each runner begin the race at the same time? Who is in the lead? How does the race end?  I have some ideas but cannot decide. I was first thinking condrocytes and osteoblasts with osteoblasts finishing first with the compact bone, but then I was thinking of blasts and clasts as one builds and one removes. Also, I thought, well maybe, cartilage and osteoblasts.

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Tissue regeneration & repair

Tissue regeneration involves the restoration of tissue components by regrowth of damaged tissues. In contrast, tissue repair involves patching of injured tissue rather than restoring it. It is the proliferative capacity of the cells that decides the amount of regeneration against the repair that would occur in the tissue. Both regeneration and repair depending on the duration of the injury and response to the inflammation.