锚钉内固定治疗股骨颈骨折的生物力学研究

目的 自行设计制造一种用于治疗肌骨颈骨折的螺钉－－锚钉。方法 选８具成年防腐尸体，每具尸体的两吸股骨分别用锚钉或加压钉固定，随机取４组在ＮＪ５０Ｂ扭转试验机上进行扭转试验，４组在ＷＤ－２５电子万能试验机上进行负载试验。记录股骨头扭转角度与扭力矩，记录股头下沉移位与负载。结果 在扭转试验中，股骨头扭转２℃及４℃时锚钉组的扭力矩显著高于加压钉组（ｔ＝２０．９１４，Ｐ〈０．０１。６＝２．７３８，Ｐ〈０－

The Biomechanics Test of Interlocked Anchoring Nail for the Treatment of femoral neck fractures

Objective To design a new screw anchoring nail for the treatment of femoral neck fractures.Methods 16 cadaver femora were fixed with anchoring nail or compression nail.Torsion angle,torque moment of force,subsidence displacement and the load of femoral head were recorded by torsion test and loading test.Results In torsion test,torque moment of force of the anchoring nail fixed group is higher than that of compression nail fixed group when the torsion angle of femoral head in 2 degree or 4 degree( t =20 914,P<0 01; t =2 738,P<0 05).In loading test,the load of anchoring nail fixed group is higher than that of compression nail fixed group when the subsidence displacement of femoral head is 2mm or 5mm( t =2 859,P<0 05; t =3 176,P<0 05).Conclusion The outstanding features of this fixation method include its surgical simplicity,cutting down operational trauma and firm fixation.Anchoring nail is able to give press to the fracture segment,to resist load and torsion,so it is a good fixation method to treat femoral neck fractures.