膜层由内部致密层和外部疏松层组成。
It is composed of inner compact layer and Outer loose layer.
退火态的膜层结构比沉积态的疏松。
结果与一般骨折愈合方式相似，软骨内成骨与膜内成骨共同参与了骨质疏松性骨折的修复，且以软骨内成骨为主。
Results in OPFM, both endochondral bone formation and intramembrane bone formation played their parts in osteoporotic fracture healing, the former played a major role.
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