Three methods have been described in the literature.*
1. A small drill bit is rotated by touching the broken
screw. The directions of rotation of the bit and screw fragment are
2. A screw extractor (with reverse threads) is
placed in the central pilot hole, then used to back out the fragment. Method
3. A flathead screwdriver inserted in the slot
(created with a cutting burr) on the top surface of the screw
Also, some special tools has been produced solely to remove
broken pedicle screws: An innovative broken pedicle screw retrieval
instrument. Weng X, Qiu G, Li J, Li S, Lee CI, Yu B, Li L. J Spinal
Disord Tech. 2007 Feb;20(1):82-4.
* Extraction of Broken
Pedicle Screws: Technical Note. Duncan, Johnny; MacDonald, Joel.
Neurosurgery. 42(6):1399-1400, June 1998
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