English Endochondral ossification English http://en.wikipedia.org/wiki/Endochondral_ossification Endochondral ossification Endochondral ossification 软骨内骨化 growth plates English Endochondral ossification growth plates growth plates ossified endochondral ossification Endochondral ossification Endochondral_ossification Endochondral ossification Wikipedia article "Endochondral_ossification" Wikipedia article cartilage ossified