髌骨骨折空心拉力螺钉组合张力带固定的生物力学

The Biomechanical Study of Tension Band with Cancellous Bone Screw for the Treatment of Patella Fracture

目的 :比较空心拉力螺钉组合张力带与常用AO、改良张力带及松质骨螺钉固定髌骨骨折的生物力学强度。方法 :取 2 0具膝关节标本 ,随机分为 4组 ,制成骨折模型 ,用四种方法固定 ,用WD -10E电子力学实验机测定四种内固定的抗张强度 ,骨折端分离 1.0mm为固定失效。结果 :四种固定方法均能满足 42 0N股四头肌收缩力 ,但与其它三种内固定方法相比 ,空心拉力螺钉抗张强度最大 (P <0 .0 5 ) ,AO张力带抗张强度最小 ,松质骨加压螺丝钉固定欠可靠。结论

Objective: To compare the biomechanical strength of tension band with cancellous bone screws with AO tension band,modified tension band and cancellous screws alone for the treatment of patella fracture.Methods:20 fresh frozen cadaveric knee specimen were divided into four groups randomly.Transverse osteotomies of the patella were performed and the simulated fractures were fixed with four techniques.The biomechanical testing was perfomed by using WD-10E electrical mechanical testing machine.The internal fixation was considered failure when fracture gap exceeding 1mm.Results:All techniques functioned adepuately under 420 N loading of quadriceps tendon.However,biomechanical strength was greatest in tension band with cancellous bone screws ( P <0.05),lowest in AO tension bands and no stability enough in cancellous bone screw alone.Conclusion:Tension band with cancellous bone screws is the best technique for the treatment of patella fracture.