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After a craniotomy, a large piece of a man's skull may be removed.

That bone piece has to be put back, right?

How to fix it and the bone piece can join the skull normally as it used to be?

There may be different methods as the bone piece's size may be different.

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The article you cited answers your question.

https://en.wikipedia.org/wiki/Craniotomy

The amount of skull that needs to be removed depends on the type of surgery being performed. The bone flap is then replaced using titanium plates and screws or another form of fixation (wire, suture, etc.).

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  • So that bone plate needs to be replaced by man-made structure? Why can not we put it back? At least skins are on it and hairs may grow again.
    – questionhang
    Commented Apr 7, 2017 at 2:24
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    @questionhang No, the skin and hair are retained and remain attached to the person. They aren't attached to the skull. Only the bone itself is removed, not the skin and tissue covering it. Replacing it with man-made material is easier, cheaper and safer for the patient.
    – Carey Gregory ♦
    Commented Apr 7, 2017 at 4:05
  • Can we put the original bone back? Is it dead after removal?
    – questionhang
    Commented Apr 9, 2017 at 12:38
  • @questionhang It can be put back and often is. Read the "Procedure" section of the link you cited.
    – Carey Gregory ♦
    Commented Apr 9, 2017 at 14:59
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    @questionhang Yes.
    – Carey Gregory ♦
    Commented Apr 10, 2017 at 3:51

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