Department of Orthopedics, Denver Health Medical Center, 777 Bannock St, MC 0188, Denver, CO, 80204, USA.
Department of Orthopedics, University of Colorado School of Medicine, Aurora, USA.
Eur J Orthop Surg Traumatol. 2020 Aug;30(6):1045-1048. doi: 10.1007/s00590-020-02665-8. Epub 2020 Apr 10.
Diastasis of the sacroiliac joint after pelvic ring injury is commonly reduced by lagging by design with partially threaded (PT) screws. There may be a biomechanical benefit to lagging by technique with fully threaded (FT) screws. The purpose of this study was to compare these two methods.
Twelve pairs of synthetic bone blocks were lagged together with 8.0-mm FT or PT screws. Maximum compressive and steady-state force was measured. Pullout force testing was performed.
The maximum compressive force of FT and PT screws was not different [mean difference (MD) 32 Newtons (N), 95% confidence interval (CI) 124, 60)]; however, lagging by technique with FT screws resulted in significantly higher steady-state force (MD 83 N, 95% CI 165, 5) and pullout force (MD 634 N, 95% CI 778, 491).
Lagging by technique with large diameter FT screws has a biomechanical advantage over lagging by design with PT screws.
骨盆环损伤后骶髂关节分离通常通过设计滞后用部分螺纹（PT）螺钉来复位。用全螺纹（FT）螺钉技术滞后可能具有生物力学优势。本研究的目的是比较这两种方法。
将 12 对合成骨块用 8.0-mm 的 FT 或 PT 螺钉进行滞后连接。测量最大压缩力和稳态力。进行拔出力测试。
FT 和 PT 螺钉的最大压缩力没有差异[平均差异（MD）32 牛顿（N），95%置信区间（CI）124，60]；然而，用 FT 螺钉进行技术滞后导致稳态力（MD 83 N，95% CI 165，5）和拔出力（MD 634 N，95% CI 778，491）显著增加。
用大直径 FT 螺钉进行技术滞后比用 PT 螺钉进行设计滞后具有生物力学优势。
