Abstract：
OBJECTIVE: There is a paucity of studies on new vertebral body tethering (VBT) surgical constructs especially regarding their potentially motion-preserving ability. This study analyses their effects on the ROM of the spine.
METHODS: Human spines (T10-L3) were tested under pure moment in four different conditions: (1) native, (2) instrumented with one tether continuously connected in all vertebrae from T10 to L3, (3) additional instrumented with a second tether continuously connected in all vertebrae from T11 to L3, and (4) instrumented with one tether and one titanium rod (hybrid) attached to T12, L1 and L2. The instrumentation was inserted in the left lateral side. The intersegmental ROM was evaluated using a magnetic tracking system, and the medians were analysed. Please check and confirm the author names and initials are correct. Also, kindly confirm the details in the metadata are correct. The mentioned information is correct RESULTS: Compared to the native spine, the instrumented spine presented a reduction of less than 13% in global ROM considering flexion-extension and axial rotation. For left lateral bending, the median global ROM of the native spine (100%) significantly reduced to 74.6%, 66.4%, and 68.1% after testing one tether, two tethers and the hybrid construction, respectively. In these cases, the L1-L2 ROM was reduced to 68.3%, 58.5%, and 38.3%, respectively. In right lateral bending, the normalized global ROM of the spine with one tether, two tethers and the hybrid construction was 58.9%, 54.0%, and 56.6%, respectively. Considering the same order, the normalized L1-L2 ROM was 64.3%, 49.9%, and 35.3%, respectively.
CONCLUSIONS: The investigated VBT techniques preserved global ROM of the spine in flexion-extension and axial rotation while reduced the ROM in lateral bending.
METHODS: Human spines (T10-L3) were tested under pure moment in four different conditions: (1) native, (2) instrumented with one tether continuously connected in all vertebrae from T10 to L3, (3) additional instrumented with a second tether continuously connected in all vertebrae from T11 to L3, and (4) instrumented with one tether and one titanium rod (hybrid) attached to T12, L1 and L2. The instrumentation was inserted in the left lateral side. The intersegmental ROM was evaluated using a magnetic tracking system, and the medians were analysed. Please check and confirm the author names and initials are correct. Also, kindly confirm the details in the metadata are correct. The mentioned information is correct RESULTS: Compared to the native spine, the instrumented spine presented a reduction of less than 13% in global ROM considering flexion-extension and axial rotation. For left lateral bending, the median global ROM of the native spine (100%) significantly reduced to 74.6%, 66.4%, and 68.1% after testing one tether, two tethers and the hybrid construction, respectively. In these cases, the L1-L2 ROM was reduced to 68.3%, 58.5%, and 38.3%, respectively. In right lateral bending, the normalized global ROM of the spine with one tether, two tethers and the hybrid construction was 58.9%, 54.0%, and 56.6%, respectively. Considering the same order, the normalized L1-L2 ROM was 64.3%, 49.9%, and 35.3%, respectively.
CONCLUSIONS: The investigated VBT techniques preserved global ROM of the spine in flexion-extension and axial rotation while reduced the ROM in lateral bending.
摘要：
目的：关于新型椎体束缚（VBT）外科构造的研究很少，尤其是关于其潜在的运动保持能力的研究。这项研究分析了它们对脊柱ROM的影响。
方法：在四种不同条件下在纯力矩下测试了人类棘（T10-L3）：（1）天然，(2)用一根系绳连续连接在T10至L3的所有椎骨中,(3)用另一根系绳连续连接在T11至L3的所有椎骨中,以及(4)用一根系绳和一根钛棒(混合)连接在T12、L1和L2上。将仪器插入左侧。使用磁跟踪系统评估段间ROM，并对中位数进行了分析。请检查并确认作者姓名和首字母是否正确。此外，请确认元数据中的详细信息是否正确。提到的信息是正确的结果：与本机脊柱相比，考虑到屈伸和轴向旋转，仪器化的脊柱在整体ROM中减少了不到13％。对于左侧横向弯曲，本地脊柱的全局ROM中位数（100％）显着降低到74.6％，66.4%,测试一根系绳后为68.1%，两个系绳和混合结构，分别。在这些情况下,L1-L2只读存储器减少到68.3%，58.5%,和38.3%，分别。右侧弯曲时,使用一根系绳的脊柱的归一化全局ROM，两条系绳和混合结构为58.9%，54.0%,56.6%,分别。考虑到同样的顺序，归一化L1-L2只读存储器为64.3%，49.9%,和35.3%，分别。
结论：研究的VBT技术在屈伸和轴向旋转时保留了脊柱的整体ROM，而在侧向弯曲时减少了ROM。
方法：在四种不同条件下在纯力矩下测试了人类棘（T10-L3）：（1）天然，(2)用一根系绳连续连接在T10至L3的所有椎骨中,(3)用另一根系绳连续连接在T11至L3的所有椎骨中,以及(4)用一根系绳和一根钛棒(混合)连接在T12、L1和L2上。将仪器插入左侧。使用磁跟踪系统评估段间ROM，并对中位数进行了分析。请检查并确认作者姓名和首字母是否正确。此外，请确认元数据中的详细信息是否正确。提到的信息是正确的结果：与本机脊柱相比，考虑到屈伸和轴向旋转，仪器化的脊柱在整体ROM中减少了不到13％。对于左侧横向弯曲，本地脊柱的全局ROM中位数（100％）显着降低到74.6％，66.4%,测试一根系绳后为68.1%，两个系绳和混合结构，分别。在这些情况下,L1-L2只读存储器减少到68.3%，58.5%,和38.3%，分别。右侧弯曲时,使用一根系绳的脊柱的归一化全局ROM，两条系绳和混合结构为58.9%，54.0%,56.6%,分别。考虑到同样的顺序，归一化L1-L2只读存储器为64.3%，49.9%,和35.3%，分别。
结论：研究的VBT技术在屈伸和轴向旋转时保留了脊柱的整体ROM，而在侧向弯曲时减少了ROM。
