The Biomechanical Study of Tension Band with Cancellous Bone Screw for the Treatment of Patella Fracture / 中国矫形外科杂志

ABSTRACT

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.