可吸收线张力带治疗髌骨骨折的生物力学研究及其临床意义

目的 探讨可吸收线张力带治疗髌骨骨折的生物力学特性及临床应用可行性。方法 取12具新鲜尸体膝关节标本制成髌骨横断骨折模型，分2组各6个膝关节，分别用双股“薇乔”l-0可吸收线和直径0．8mm钢丝做张力带固定，将标本安置在MTS试验机上，行拉力试验和疲劳试验，测量各种试验前后的骨折端分离程度。结果 在0～300N之间可吸收线张力带比钢丝张力带抗疲劳性能强，在300～500N之间两者效果相当；可吸收线张力带比钢丝张力带固定具有更好的弹性。结论 可吸收线张力带治疗髌骨骨折的生物力学性能比钢丝张力带好，完全可替代钢丝应用于临床。

Biomechanical study and its clinical significance of tension band assimilable thread in treatment of patella fractures

Objective To explore the biomechanical characters and the clinical feasibility of tension band assimilable thread in the treatment of patella fractures. Methods The transverse fracture model of the patella was made in 12 knee joints of fresh corpses,which were divided into two groups (Group A and Group B,six knee joints each). The patella fractures in the Group A was fixed by a two-ply tension band assimilable thread and those in the Group B by a tension band steel wire with diameter of 0.8 mm. Each specimen fixed on MTS machine was used for the tensile test and the fatigue test as well as for measurement of disjunct width of each fractured patella before and after the tests. Results The capacity of anti-fatigue of tension band assimilable thread was better than that of steel wire;while the capacity of anti-tiredness of tension band assimilable thread was equivalent to that of steel wire when the pulling force was 300-500 N. The tension band assimilable thread had better elasticity than the steel wire. Conclusions The tension band assimilable thread is better than the steel wire in treatment of patella fractures and can surely alternate the steel wire in clinical application.