Biomechanical Study On Occipitocervical Fusion Fixed By Metallic-Rectangular Frame

Objective:In order to provide the mechanical evidence of selfmanufactured metallic-rectangular frame's clinical applications, We evaluated the stability of Occipitocervical junction fixed by it.Methods: Seven of the cerical spinal specimens adult entire wet-cadavers (occipital to C6) were simulated the C1-C2 fracture dislocation. These of specimens dislocated were fixed successively by metallic-rectangular frame, Occipito-cervical plate .The three dimensional movements of C0-C2 were recorded through photogrametry with a pure moment of 1.53Nm. The range of motion(ROM) of each specimens in two fixation was caculated.Results: Loaded by 1.53Nm, In metallic-rectangular framefixation, the ROM in flexion, extension, lateral bending and axial rotation were 5.9, 7.7, 5.6, 11.2 respectively, It decreased 157.6%, 68.8%, 58.9%, 131.3% when fixed by occipitocer-vical plate fixation group.Conclusions: Metallic-retangular frame fixation can econstr-uct the stability of Occipitocervical junction immediatey , and is a relativity effective internal fixation for occipitocervical fusion.