How do doctors know what type of screws to put into someone's back to fix the vertebrae?

The bones in the spine, the vertebrae sometimes need to be fixed or stabilized and this often includes using screws. Through many years of research, doctors know which size screws work best in which circumstances. As well, the doctors must thoroughly evaluate the patients, taking into account their age, their size, and many other issues. It is with all this information together that the doctors make their decisions.

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