Bone occurs in two typical forms, spongy and compact. 骨有兩種類(lèi)型，即松質(zhì)骨與堅質(zhì)骨。
While the filling itself did not fail in these ertebrae, the cancellous bone around the cement collapsed progressiely. 雖然椎體內的填充物本身沒(méi)有發(fā)生破裂，但骨水泥周?chē)乃少|(zhì)骨卻逐漸地發(fā)生了塌陷。
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