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- W2387515104 abstract "objective To evaluate the biomechanical stability of four posterior internal fixation techniques for occipitocervical spine.Methods Six occipitocervical spines of fresh cadavers were classified for 6 subgroups as follows:normal samples(NS),removal of odontoid samples(DS),internal fixation of occipital screws and transpedicle screws of C2(AF),internal fixation from occipital screws to transpedicle screws of C2 and lateral mass screws of C3(BF),internal fixation from occipital screws to transpedicle screws of C2 and laminal hooks of C3(CF),and internal fixation of occipital screws and laminal hooks of C3 and C4(DF).With KD-1 3D motion testing device,the movement parameters of 6 subgroups samples were measured.The data were analyzed statistically.Results Range of motion(ROM)of DS group increases 10-12% compared to NS group(P0.05).ROM of AF group decreased to 13-16% compared to DS group(P0.05),but still increased nonsignificantly 5-6% as for NS group(P0.05).And compared to the DS group,ROM of BF、CF and DF decrease 17-19%、18-23% and 19-23% respectively(P0.05).In DF group,the laminal hooks had gliding tendency,and the compensatory activity of vicinity segments augmented.Conclusions To perform internal fixation of occipitocervical spine,occipital screws and transpedicle screws are stable enough biomechanically.If lateral mass screws or laminal hooks have been added in C3,the more stable can be obtained but the movement of C2-3 must be sacrificed.When laminal hooks of C3 and C4 were usedstability can be obtained,but the hooks have a tendency of lateral sliding,even more with the longest segment fixation,the junction segments degenerate faster." @default.
- W2387515104 created "2016-06-24" @default.
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- W2387515104 date "2007-01-01" @default.
- W2387515104 modified "2023-09-28" @default.
- W2387515104 title "The biomechanical study on four internal fixation techniques for occipitocervical spine" @default.
- W2387515104 hasPublicationYear "2007" @default.
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