Department of Orthopaedic Surgery, Zhejiang Hospital, Zhejiang, China.
Department of Orthopaedic Surgery, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang Spine Surgery Centre, Zhejiang, China.
Orthop Surg. 2022 Feb;14(2):341-348. doi: 10.1111/os.13185. Epub 2021 Dec 22.
To investigate the prevalence of 11 thoracic vertebrae (TVs), four lumbar vertebrae (LVs) and six LVs among asymptomatic Chinese volunteers, and the influence of spine variations on the global spinal sagittal parameters.
A total of 389 asymptomatic Chinese volunteers were recruited. Each subject underwent a full-spine X-ray examination with measurement of global spinal sagittal parameters. The radiographs were examined by a spine surgeon and a radiologist to determine the variation in the number of vertebrae. These parameters were used to compare individuals with five LVs to those with 11 TVs, four LVs, and six LVs.
The study population included 12 individuals (3.1%) with seven cervical vertebrae (C) + 11 thoracic vertebrae (T) + five lumbar vertebrae (L), 8 (2.1%) with 7C + 11T + 6L, 8 (2.1%) with 7C + 12T + 4L, and 15 (3.9%) with 7C + 12T + 6L. Compared to the 7C + 12T + 5L individuals, those with 7C + 11T + 5L had significantly lower C -T Cobb values (P < 0.05); 7C + 12T + 4L individuals had significantly greater thoracic inlet angles (P < 0.05) and significantly lower pelvic tilt (P < 0.05); individuals with 7C + 12T + 6L had significantly greater sacral slope, pelvic tilt, pelvic incidence, and L1-5 Cobb values (all P < 0.05), but significantly lower thoracic inlet angle (P < 0.05). There were no significant differences in any of the parameters examined between the 7C + 11T + 6L group and the 7C + 12T + 5L group.
Asymptomatic adults with 7C + 12T + 6L, 7C + 12T + 4L, and 7C + 11T + 5L presented with different spinal sagittal alignment compared to those with 7C + 12T + 5L. Compared to variation in the number of LVs, the variation in the number of TVs had less effect on global spinal sagittal parameters. Spinal surgeons and researchers should be aware of the effects of variation in numbers of TVs and LVs on global spinal parameters and sagittal balance.
研究无症状中国志愿者 11 个胸椎（T）、4 个腰椎（L）和 6 个 L 的发生率，以及脊柱变异对整体脊柱矢状参数的影响。
共纳入 389 名无症状中国志愿者。每位受试者均接受全脊柱 X 线检查，并测量整体脊柱矢状参数。脊柱外科医生和放射科医生对 X 线片进行检查，以确定椎体数量的变异。这些参数用于比较 5 个 L 的个体与 11 个 T、4 个 L 和 6 个 L 的个体。
研究人群中，12 人（3.1%）有 7 个颈椎（C）+11 个胸椎（T）+5 个腰椎（L），8 人（2.1%）有 7C+11T+6L，8 人（2.1%）有 7C+12T+4L，15 人（3.9%）有 7C+12T+6L。与 7C+12T+5L 个体相比，7C+11T+5L 个体的 C-T Cobb 值显著降低（P<0.05）；7C+12T+4L 个体的胸入口角显著增大（P<0.05），骨盆倾斜度显著降低（P<0.05）；7C+12T+6L 个体的骶骨倾斜度、骨盆倾斜度、骨盆入射角和 L1-5 Cobb 值显著增大（均 P<0.05），但胸入口角显著减小（P<0.05）。7C+11T+6L 组与 7C+12T+5L 组在所有检查参数方面均无显著差异。
与 7C+12T+5L 相比，7C+12T+6L、7C+12T+4L 和 7C+11T+5L 的无症状成人的脊柱矢状排列不同。与腰椎数量的变化相比，胸椎数量的变化对整体脊柱矢状参数的影响较小。脊柱外科医生和研究人员应意识到胸椎和腰椎数量变化对整体脊柱参数和矢状平衡的影响。
