Objective: Dorsal stabilization is a frequently used procedure in the treatment of acute traumatic vertebral body fractures. Besides the traditional open surgical procedure, the percutaneous positioning of pedicle screws is now widely used. The aim of the current study is to compare pedicle screw misplacement following open vs. percutaneous dorsal instrumentation after traumatic spinal fracture of the thoracic and lumbar spine and to assess possible risk factors associated with pedicle screw misplacement.
Methods: All patients who suffered a traumatic spinal fracture that were treated with dorsal stabilization in our level I trauma center in the period from 01/2007 to 03/2014 were included in this retrospective therapeutic cohort study. From 01/2007 to 06/2009, an open surgical procedure was used, and from 06/2009 to 03/2014, the percutaneous procedure was used for all types of fractures. Retrospectively, the positioning of every single pedicle screw was evaluated in the post-operative computed tomography scan and classified. Epidemiological data were also documented to compare the two treatment groups.
Results: A total of 491 patients with 681 vertebral body fractures were included. Of 733 pedicle screws placed during the open surgery procedure, 96.0% were within the safe zone. There was no significant difference compared with pedicle screws placed percutaneously (95.3% of 1884 screws). In all other categories, the number of misplaced pedicle screws also showed no differences between the two treatment groups. There is a positive correlation between pedicle screw misplacement and duration of the operation. Most pedicle screws are misplaced at the levels T12, L1 and T7, T8.
Conclusion: The current study shows that percutaneous surgery using dorsal stabilization allows the positioning of pedicle screws in an equivalently safe manner compared with an open surgical procedure in the acute care of spinal trauma.
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