Biomechanical study on occipitocervical fusion fixed by metallic-rectangular frame / 中国矫形外科杂志

ABSTRACT

[Objective]To provide the mechanical evidence of self manufactured metallic-rectangular frame on the reconstruction of the stability of occipitocervical junction.[Method]Seven of the adult cervical spinal specimens which were entire wet-cadavers(from occipitale to C_6) were made to simulate the C_(0～2) fracture dislocation.These of specimens dislocated were fixed by metallic-rectangular frame and Occipito-cervical plate respectively.The three dimensional movements of C_(0～2) were recorded through photogrametry with a pure moment of 1.53 Nm.The range of motion(ROM) of each specimens in two fixation was caculated.[Result]Loaded by 1.53Nm,In metallic-rectangular frame fixation,the ROM in flexion,extension,lateral bending and axial rotation were 5.9?、7.7?、5.6?、11.2? respectively,decreased by 157.6%、68.8%、58.9%、131.3%,compared with occipitocervical plate fixation group.[Conclusion]Metallic-retangular frame fixation can reconstruct the stability of Occipitocervical junction immediatey,and is a relativity effective internal fixation for occipitocervical fusion.