Department of Orthopaedics, Wuxi No. 9 People's Hospital Affiliated to Soochow University, No. 999 Liangxi Road, Wuxi, 214062, Jiangsu, China.
Eur Spine J. 2022 Oct;31(10):2572-2578. doi: 10.1007/s00586-022-07257-0. Epub 2022 Jun 10.
The outlet of the classic sacroiliac screw (SIS) cannot be precisely controlled by aiming devices, which may lead to malpositioned implants and neurovascular and visceral injury. This study aimed to radio-anatomically measure the parameters of the channel for anterior-posterior placement SIS (AP-SIS), which can be placed percutaneously with an aiming device.
Pelvic CT scan data of 80 healthy adults (40 males and 40 females) with an average age of 45 years (range 20-70 years) were collected. The length (L), width (W), height (H), cortical bone spacing (M), camber angle (E), anteversion angle (F), cross-sectional safety angle (P) and sagittal safety angle (Q) of the channel were measured by CT or Mimics software.
The L, W, H, M, E, F, P and Q measures of S1 were 109.2 ± 8.0 mm, 18.5 ± 1.9 mm, 21.7 ± 1.7 mm, 8.1 ± 0.4 mm, 44.2 ± 3.2°, 42.4 ± 3.6°, 16.8 ± 1.1°, and 19.4 ± 2.0°, respectively, for S1, and 113.5 ± 9.4 mm, 18.2 ± 1.5 mm, 21.7 ± 1.7 mm, 7.7 ± 0.4 mm, 44.7 ± 3.2°, 31.2 ± 2.7°, 13.8 ± 1.0° and 15.4 ± 1.4°, respectively, for S2. Of the L measures, the intra-iliac segment was slightly longer than the intra-sacral segment. All parameters showed significant sex-related differences (p < 0.05).
The AP-SIS channels of S1-2 have sufficient width and length to accommodate a cancellous screw with a Φ 7.0-8.0 mm and a length 90-130 mm. The intra-iliac segment is a long channel screw with better mechanical properties over classic SIS.
经典骶髂螺钉（SIS）的出口无法通过瞄准装置精确控制，这可能导致植入物位置不当以及神经血管和内脏损伤。本研究旨在对经皮使用瞄准装置可放置的前后位 SIS（AP-SIS）通道的参数进行放射解剖学测量。
收集 80 名健康成年人（40 名男性和 40 名女性）的骨盆 CT 扫描数据，平均年龄为 45 岁（范围 20-70 岁）。使用 CT 或 Mimics 软件测量通道的长度（L）、宽度（W）、高度（H）、皮质骨间距（M）、弓角（E）、前倾角（F）、横断安全角（P）和矢状安全角（Q）。
S1 的 L、W、H、M、E、F、P 和 Q 测量值分别为 109.2±8.0mm、18.5±1.9mm、21.7±1.7mm、8.1±0.4mm、44.2±3.2°、42.4±3.6°、16.8±1.1°和 19.4±2.0°，S2 分别为 113.5±9.4mm、18.2±1.5mm、21.7±1.7mm、7.7±0.4mm、44.7±3.2°、31.2±2.7°、13.8±1.0°和 15.4±1.4°。在 L 测量值中，髂内段略长于骶骨段。所有参数均显示出显著的性别差异（p<0.05）。
S1-2 的 AP-SIS 通道具有足够的宽度和长度，可以容纳直径为 7.0-8.0mm、长度为 90-130mm 的松质骨螺钉。髂内段是一种长通道螺钉，与经典 SIS 相比具有更好的机械性能。
