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<a accesskey="3" href="page.php?w=Herbert_screw&amp;p=2">3.Next</a>
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<p>The <b>Herbert screw</b> (invented by <a href="page.php?w=Timothy_Herbert">Timothy Herbert</a>) is a variable pitch <a href="page.php?w=cannula">cannula</a>ted screw typically made from <a href="page.php?w=titanium">titanium</a> for its biocompatible properties, as the screw is normally intended to remain in the patient indefinitely. It became generally available in 1978. It is one of the earliest designs of headless compression screws, which are used to achieve interfragmentary compression through its differential pitch between the threads at</p><p>
<a accesskey="3" href="page.php?w=Herbert_screw&amp;p=2">3.Next</a>
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