Objective: 

To determine what size S1-transsacral (TS) corridor is amenable to TS screw placement, as this is commonly used to identify sacral dysmorphism, and to determine if gender, ethnicity, or screw breach is associated with narrow corridors.

Design: 

Retrospective review.

Setting: 

Urban level-1 trauma center.

Patients: 

Two hundred ninety patients with pelvic ring injuries and preoperative computed tomography (CT) scans.

Intervention: 

Percutaneous posterior pelvic ring fixation.

Main Outcome Measurements: 

The width of the S1-TS corridor was measured on the axial (inlet) and coronal (outlet) reformatted CT images. Patients with S1-TS screw fixation and postoperative CT scans were identified. Corridor size, gender, ethnicity, and screw breach were documented.

Results: 

S1-TS screws were placed in 55 of the 290 patients. No S1-TS screws were placed in corridors less than 8 mm. Corridors of <8 mm were present in 114 (39%) of the 290 patients and were not associated with gender or ethnicity. S1-TS screws placed in small (<10 mm) versus large (≥10 mm) corridors did not have a detectable difference in screw breaches (5 of 8, 62% versus 19 of 47 40%; difference, 22%, 95% confidence interval −14% to 52%) or median (interquartile range) screw breach distance [3 mm (2.5–4.8) versus 3 mm (1.2–4.8); difference, 0.9 mm; confidence interval −1.6 to 2.2].

Conclusion: 

These data are useful for the standardization of sacral dysmorphism reporting based on corridor size. Screw breaches were common irrespective of TS corridor size, emphasizing the small degree of error allowed by this procedure.

Level of Evidence: 

Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.

中文翻译：

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骶骨畸形的定义：什么尺寸的走廊妨碍经骶骨螺钉植入

客观的： 

确定什么尺寸的 S1-经骶骨 (TS) 通道适合 TS 螺钉放置，因为这通常用于识别骶骨畸形，并确定性别、种族或螺钉断裂是否与狭窄通道相关。

设计： 

回顾性审查。

环境： 

市一级外伤中心。

患者： 

290 名骨盆环损伤患者和术前计算机断层扫描 (CT) 扫描。

干涉： 

经皮骨盆后环固定术。

主要结果测量： 

S1-TS 走廊的宽度是在轴位（入口）和冠状位（出口）重新格式化的 CT 图像上测量的。确定了采用 S1-TS 螺钉固定和术后 CT 扫描的患者。记录了走廊的大小、性别、种族和螺丝破坏情况。

结果： 

290 名患者中有 55 名植入了 S1-TS 螺钉。没有 S1-TS 螺钉放置在小于 8 mm 的通道内。290 名患者中有 114 名 (39%) 的走廊小于 8 毫米，并且与性别或种族无关。放置在小（<10 毫米）与大（≥10 毫米）通道中的 S1-TS 螺钉在螺钉断裂方面没有可检测的差异（8 个中有 5 个，62% 对 47 个中有 19 个 40%；差异，22%，95%置信区间 -14% 至 52%）或中值（四分位距）螺钉断裂距离 [3 mm (2.5–4.8) 对 3 mm (1.2–4.8)；差异，0.9 毫米；置信区间 -1.6 至 2.2]。

结论： 

这些数据对于基于走廊大小的骶骨畸形报告的标准化很有用。无论 TS 走廊大小如何，螺钉断裂都很常见，强调了此程序允许的小程度错误。

证据等级： 

预后等级 III。有关证据等级的完整描述，请参阅作者须知。