Always cartilage: The stages of healing bone fractures are: blood clots are organized by chondroblast cells into cartilage. Then invading osteoblasts convert the cartilage in bone structure; which is constantly being remodeled by both osteoclast & osteoblast cells; influenced by blood flow; physical stress loads, etc. Yet many genetic, epigenetic; physiologic controls remain poorly understood.
Answered 4/25/2015
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