Department of Orthopaedic Surgery, UC Davis, Sacramento, CA.
Department Veterinary Medicine: Surgical & Radiological Sciences, UC Davis School of Veterinary Medicine, Sacramento, CA; and.
J Orthop Trauma. 2024 Nov 1;38(11S):S35-S39. doi: 10.1097/BOT.0000000000002882.
The purpose of this study was to evaluate the biomechanical stability of a modified triangular osteosynthesis construct with S1 pedicle screws compared with other described lumbopelvic fixation constructs in a U-type sacral fracture model.
U-type sacral fractures were created in validated fourth-generation spinopelvic models. Four different constructs were cyclically loaded with displacement measured in all planes: (1) bilateral L5 pedicle screws with rods attached to iliac bolts, (2) bilateral L5 and S1 pedicle screws with rods attached to iliac bolts, (3) bilateral L5 pedicle screws with rods attached to iliac bolts with a transsacral-transiliac screw, and (4) bilateral L5 and S1 pedicle screws with rods attached to iliac bolts with a transsacral-transiliac screw.
The bilateral L5 and S1 pedicle screws with rods attached to iliac bolts with a transsacral-transiliac screw construct had significantly decreased horizontal, vertical, and angular displacement compared with all other constructs.
From a biomechanical perspective, a modified triangular osteosynthesis construct with S1 pedicle screws improves stability in fixation of U-type sacral fractures.
本研究旨在评估改良的三角形骨合成结构与 S1 椎弓根螺钉的生物力学稳定性，与 U 型骶骨骨折模型中其他描述的腰骶固定结构进行比较。
在经过验证的第四代脊柱骨盆模型中创建 U 型骶骨骨折。在所有平面上测量位移，对四种不同的结构进行循环加载：（1）双侧 L5 椎弓根螺钉与髂骨螺栓相连的杆，（2）双侧 L5 和 S1 椎弓根螺钉与髂骨螺栓相连的杆，（3）双侧 L5 椎弓根螺钉与髂骨螺栓相连的杆，带有经骶骨-髂骨螺钉，（4）双侧 L5 和 S1 椎弓根螺钉与髂骨螺栓相连的杆，带有经骶骨-髂骨螺钉。
双侧 L5 和 S1 椎弓根螺钉与髂骨螺栓相连的杆，带有经骶骨-髂骨螺钉的结构与所有其他结构相比，水平、垂直和角度位移显著减少。
从生物力学的角度来看，改良的三角形骨合成结构与 S1 椎弓根螺钉的结合可改善 U 型骶骨骨折固定的稳定性。
