Objective： To investigate the stability and three-dimensional movements of the atlantoaxial joint after artificial atlanto-odontoid joint （AAOJ） arthroplasty by comparing with a conventional method. Methods： Afte...Objective： To investigate the stability and three-dimensional movements of the atlantoaxial joint after artificial atlanto-odontoid joint （AAOJ） arthroplasty by comparing with a conventional method. Methods： After anterior decompression, 24 human ca- daveric spinal specimens of C0-C3 were randomly divided into two groups： Group A receiving artificial AAOJ arthroplasty; Group B experiencing anterior transarticular screw （ATAS） fixation. Two groups underwent flexibility test in intact and instrumented states. Rotational angle of the C0-C3 segments was measured to study the immediate stability and function of anterior decompression with AAOJ arthroplasty compared with the intact state and ATAS fixation. Results： Compared with the intact state, anterior decompression with AAOJ arthroplasty resulted in a sig- nificant decrease in the range of motion （ROM） and neu-tral zone （NZ） during flexion, extension and lateral bending （P〈0.05）; however, with regard to axial rotation, there was no significant difference in ROM and NZ （P〉0.05）. Com- pared with anterior decompression with ATAS fixation, an- terior decompression with AAOJ arthroplasty during flexion, extension and lateral bending, significant differ- ence was found in ROM and NZ （P〉0.05）; however, as for axial rotation, there was a significant increase in ROM and NZ （P〈0.05）. Conclusion： The self-designed AAOJ has an excellent biomechanical performance, which can restore excellent in- stant stability and preserve the movement of the atlanto- axial joint.展开更多
基金The program was supported by Medical Research Found of Zhejiang Provincial Health Department，Ningbo Natural Science Foundation
文摘Objective： To investigate the stability and three-dimensional movements of the atlantoaxial joint after artificial atlanto-odontoid joint （AAOJ） arthroplasty by comparing with a conventional method. Methods： After anterior decompression, 24 human ca- daveric spinal specimens of C0-C3 were randomly divided into two groups： Group A receiving artificial AAOJ arthroplasty; Group B experiencing anterior transarticular screw （ATAS） fixation. Two groups underwent flexibility test in intact and instrumented states. Rotational angle of the C0-C3 segments was measured to study the immediate stability and function of anterior decompression with AAOJ arthroplasty compared with the intact state and ATAS fixation. Results： Compared with the intact state, anterior decompression with AAOJ arthroplasty resulted in a sig- nificant decrease in the range of motion （ROM） and neu-tral zone （NZ） during flexion, extension and lateral bending （P〈0.05）; however, with regard to axial rotation, there was no significant difference in ROM and NZ （P〉0.05）. Com- pared with anterior decompression with ATAS fixation, an- terior decompression with AAOJ arthroplasty during flexion, extension and lateral bending, significant differ- ence was found in ROM and NZ （P〉0.05）; however, as for axial rotation, there was a significant increase in ROM and NZ （P〈0.05）. Conclusion： The self-designed AAOJ has an excellent biomechanical performance, which can restore excellent in- stant stability and preserve the movement of the atlanto- axial joint.
