Pyrford钢丝环扎加张力带内固定治疗髌骨骨折的生物力学分析

目的　测试Pyrford钢丝环扎加张力带内固定治疗髌骨骨折的生物力学特性 ,为临床治疗提供理论依据。方法　采集新鲜牛尸体膝关节标本 6具 ,制成髌骨骨折模型 ,用Pyrford钢丝环扎加张力带固定 ,并与克氏针张力带、单纯钢丝环扎进行对照比较。结果　Pyrford钢丝环扎加张力带内固定完全符合髌骨的生物力学性能 ,与克氏针张力带相当 ,能满足膝关节的强度 ,符合人体正常生理功能要求。结论　Pyrford钢丝环扎加张力带固定治疗髌骨骨折 ,具有优越的生物力学性能 ,且能达到解剖复位 ,操作简便 ,固定牢固 ,适应早期功能锻炼的目的

Biomechanical Evaluation of Patella Fractures Fixed with the Combination of Cerclage Wiring and a Tension Band (Pyrford technique)

Objective To investigate the probabilities of clinical application of Pyrford technique.Biomechanical testing was performed to evaluate biomechanical characteristics of patella fractures which fixed with the combination of cerclage wiring and a tension band(Pyrford technique). Methods Using ox cadaveric knee joints, transverse osteotomies of the patella were performed, and the simulated fractures fixed with the following techniques: the combination of cerclage wiring and a tension band(Pyrford technique), tension band with kirschner pins, and cerclage with wires alone. The effectiveness of fixation was measured and compared. Results Pyrford technique, same to tension band with kirschner pins, was fit for the biomechanical characteristics of patella. Pyrford technique could meet the need of strength, rigidity and physiological function of the knee joint. Conclusion The patella fractures fixed with the combination of cerclage wiring and a tension band(Pyrford technique) had advantages such as excellent biomechanical capabilities, anatomical reduction, simple operation, firm fixation, and suitable to function exercise in early stage.