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- W3032769458 abstract "Objective To study the impact of C1 assimilation (C1 A) on C2 pedicle screw insertion,and variation of C2 screw insertion techniques. Methods Seventeen C1 A patients which needed C2 pedicle screw insertion and fixation were collected, including 14 cases of atlantoaxial dislocation and 3 cases of Chiari malformation. All patients underwent thin slice CT scanning. The C2 pedicle screw was virtually inserted by using computer-assisted navigation, and the maximum pedicle screw diameter (MPSD), which could be inserted without breaching the C2 pedicle cortex was measured in 3-plane reconstruction. All patients underwent surgery according to the measurement. Results In C1 A group, the mean MPSD of 34 pedicles was (5.8 ± 1.4)mm; and in 5 of 34 (15%) pedicles, the MPSD was less than 4 mm. In non-C1 A group, the mean MPSD of 50 pedicles was (6. 5 ± 1.4) mm; and in 4 (8%)pedicles, the MPSD was less than 4 mm. The mean MPSD had statistical significance between two groups (P ＜ 0. 05). For patients not suitable to C2 pedicle screw insertion, the fixation was executed by extending the fixation to C3 in 2 patients,by using C2 pars interarticularis screw in 2, and inter-laminar screw in 1. Conclusions C2 pedicle in C1 A patient is relatively narrower; more attention should be paid, or alternative screw insertion techniques can be used.Key words: C1 assimilation; C2pedicle; Screw insertion" @default.
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- W3032769458 date "2010-10-28" @default.
- W3032769458 modified "2023-09-25" @default.
- W3032769458 title "Impact of C1 assimilation on C2 pedicle screw insertion" @default.
- W3032769458 doi "https://doi.org/10.3760/cma.j.issn.1001-2346.2010.010.017" @default.
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