95°接骨板与逆行髓内钉治疗股骨髁上骨折生物力学研究

目的:研究股骨远端逆行髓内钉与动力髁(DCS)固定股骨髁上骨折的生物力学特征,比较两种内固定物固定股骨远端骨折的初期稳定度。方法:15具人造股骨随机分为逆行髓内钉组、DCS组和对照组(每组各5具),逆行髓内钉组与DCS组制作髁上骨折模型后分别应用逆行髓内钉固定及接骨板固定,对照组股骨不作任何处理,应用生物力学测试仪进行轴向加压与扭转测试,比较各组轴向与扭转刚度。结果:在股骨远端骨折的固定中,逆行髓内钉可以提供与DCS接骨板相同程度的初期稳定度。结论:逆行髓内钉与DCS接骨板具有相似的轴向与扭转刚度,逆行髓内钉适用于关节外股骨远端骨折。

Biomechanics Study on Internal Fixation for Supracondylar Fracture of Femur with 95 Degree Plate and Retrograde Intramedullar Nail

Objective:To study the biomechanics on internal fixation for supracondylar fracture of femur with 95 degree plate and retrograde intramedullar nail,and to investigate the fixation stable of the plate and retrograde intramedullar nail.Methods:The 15 artificial femur models were divided into DCS group,retrograde intramedullar nail group and control group.The artificial femurs of DCS group and retrograde intramedullar nail group were performed supracondylar fracture and fixed with 95 degree plate and retrograde intramedullar nail.The artificial models of three groups were test to investigate axial and torsional stiffness by bionix858 test system.Results:The stability would be satisfied in the internal fixation for the fracture of femur with retrograde intramedullar nail.The stable degree was the same as the DCS group in the early stage of fracture fixation.Conclusion:The axial and torsional stiffness are same between DCS and retrograde intramedullar nail.The retrograde intramedullar nail is ideal choice in fixation for supracondylar fracture of femur.