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Misplacement of Pedicle Screws in Spine Fusion Surgery.
Pedicle screws are sometimes used as an adjunct to spinal fusion surgery, and they provide a means of gripping a spinal segment. The screws themselves do not fixate the spinal segment, but in fact act as firm anchor points that can then be connected with a rod. There is a steep learning curve for placing pedicle screws, and only qualified surgeons comfortable and experienced with this difficult technique should attempt it. Misplacement of a pedicle screw during surgery, for example, is increasingly not a rare event.
Earlier in the 1980 's there was an unfortunate pedicle rod and screw breakage rate of about 10%.
Now, with modern pedicle screws, the breakage rate has been reduced to about one in 1,000. An analysis of 2,500 patients by 350 physicians conducted by the North American Spine Society found that the complication rate with using pedicle screws in spinal surgery is low. There is now approximately a one in 1,000 chance of nerve root damage, and a 2% to 3% chance of infection. A more likely scenario today would be the misplacement of the pedicle screw by the surgeon.
[http://www.spine-health.com/treatment/spinal-fusion/pedicle-screws-spine-fusion; http://www.medquestltd.com/misplacement-of-pedicle-screws-unlimited-case unlimited-case-reviews]
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