CT correlation of spinal canal diameter with pedicle size for safer posterior cervical pedicle screw fixation.

Surgical neurology international Pub Date : 2024-08-30 eCollection Date: 2024-01-01 DOI:10.25259/SNI_590_2024
Yushi Nagano, Hitoshi Yamahata, Ryutaro Makino, Nayuta Higa, Jun Sugata, Shingo Fujio, Ryosuke Hanaya
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Abstract

Background: Utilizing computed tomography (CT) studies, we correlated cervical spinal canal diameters (SCDs) with pedicle size between the C3 and C7 levels to more safely perform posterior cervical surgery.

Methods: We retrospectively analyzed CT studies for 71 patients with cranial or spinal disorders and correlated the cervical SCD with the pedicle outer width (POW) between the C3 and C7 levels. Patients were divided into normal (SCD ≥12 mm at any level, n = 30) and stenosis groups (SCD <12 mm at any level, n = 41).

Results: C7 exhibited the largest SCD and POW values, while C3 and C4 exhibited the smallest SCD and POW values. Moderate correlations (r = 0.3, P = 0.002) were observed at the C3 and C4 levels but no significant correlations were observed from the C5 to C7 levels. For SCD values, the normal group demonstrated significantly greater values between the C3 and C7 levels versus the stenosis group. For POW values, only the C4 level differed significantly between the two groups (P = 0.014, Mann-Whitney U-test).

Conclusion: Preoperative pedicle size evaluation remains an essential manoeuvre before performing cervical C3-C7 pedicle screw placement. In 71 cervical CT studies, we found no consistent correlation between POW and SCD values, indicating that it is difficult to estimate POW values based on spinal canal size.

椎管直径与椎弓根尺寸的 CT 相关性,以实现更安全的颈椎后路椎弓根螺钉固定。
背景:利用计算机断层扫描(CT)研究,我们将颈椎椎管直径(SCD)与C3和C7水平之间的椎弓根大小相关联,以便更安全地实施颈椎后路手术:我们回顾性地分析了71名颅骨或脊柱疾病患者的CT检查结果,并将颈椎椎管直径(SCD)与C3和C7水平之间的椎弓根外宽(POW)相关联。患者被分为正常组(任何级别的SCD≥12毫米,n = 30)和狭窄组(SCD n = 41):结果:C7 的 SCD 和 POW 值最大,而 C3 和 C4 的 SCD 和 POW 值最小。在 C3 和 C4 水平观察到中度相关性(r = 0.3,P = 0.002),但在 C5 至 C7 水平未观察到显著相关性。在 SCD 值方面,正常组与狭窄组相比,C3 和 C7 水平的值明显更大。就POW值而言,两组之间只有C4水平有显著差异(P = 0.014,曼-惠特尼U检验):结论:在进行颈椎C3-C7椎弓根螺钉置入术之前,术前椎弓根尺寸评估仍然是一项重要的操作。在 71 项颈椎 CT 研究中,我们发现 POW 值和 SCD 值之间没有一致的相关性,这表明很难根据椎管大小来估计 POW 值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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