Department of Orthopaedic Surgery, Medical College of Wisconsin, Milwaukee, WI; and.
Marquette University, Orthopaedic and Rehabilitation Engineering Center, Milwaukee, WI.
J Orthop Trauma. 2023 Jun 1;37(6):e253-e257. doi: 10.1097/BOT.0000000000002556.
To explore the performance of headless screws with FiberWire Suture as a tension band and headless screws with a mini-cable tension band in patella fixation.
A transverse osteotomy was created in 6 matched pairs of fresh-frozen cadaver knee joints. One knee was randomly assigned to receive fixation with headless screws plus a cable tension band while the other was fixed with headless screws plus a suture tension band. Using a servo-hydraulic material testing system, the specimens were first tested nondestructively under 20% of the reported mean failure load with a standard technique of cannulated screws with tension band wiring. The specimen was then loaded to 1000 N to test the construct's failure strength. All tests were run under displacement-control with loading threshold. A motion analysis system was used to track the interfragmentary motion to assess fixation stability.
In the nondestructive loading test, gap displacement under 150 N was 0.10 mm or less for 11 of 12 specimens, and the difference between the 2 groups was not statistically significant. In the destructive test, 3 of 12 specimens maintained reduction (gap <2 mm) at the maximum load of 1000 N. Of the failed specimens, the mean strength was 648 ± 185 N for suture and 784 ± 228 N for cable.
There was no significant difference in fixation strength or subfailure fragment displacement between the suture and cable tension band techniques when using headless screws.
探讨无头螺钉联合 FiberWire 缝线作为张力带与无头螺钉联合微型电缆张力带在髌骨固定中的应用效果。
对 6 对新鲜冷冻的尸体膝关节进行横向骨切开术。随机选择一侧膝关节采用无头螺钉联合电缆张力带固定，另一侧采用无头螺钉联合缝线张力带固定。使用伺服液压材料测试系统，首先采用标准的空心螺钉联合张力带缝线技术，在 20%报告的平均失效载荷下对标本进行无损测试。然后将标本加载至 1000N，测试构建物的失效强度。所有测试均在加载阈值下进行位移控制。使用运动分析系统跟踪骨间运动，评估固定稳定性。
在无损加载测试中，12 个标本中有 11 个的间隙位移在 150N 以下为 0.10mm 或更小，两组之间的差异无统计学意义。在破坏性测试中，12 个标本中有 3 个在最大负载 1000N 时保持了复位（间隙<2mm）。失效的标本中，缝线组的平均强度为 648±185N，而电缆组为 784±228N。
在使用无头螺钉时，缝线和电缆张力带技术在固定强度或亚失效骨块位移方面没有显著差异。
