动力髋螺钉螺旋刀片固定用于股骨颈骨折的抗压和防旋能力

Anti-compression and anti-rotation ability of dynamic hip screw-blade fixation for femoral neck fracture

目的:对比分析动力髋螺钉螺旋刀片(DHS-B)用于治疗股骨颈骨折的抗压及防旋能力。方法:取4具尸体制备8个股骨颈骨折标本,随机分为2组,观察组(A组)采用DHS-B固定,对照组(B组)采用3枚空心加压螺钉(CCS)固定。采用轴向载荷实验、水平扭转实验、轴向加压实验测评2种固定方案的抗压、防旋能力。结果:轴向载荷500N时,A组股骨内侧及外侧应变值均明显低于B组(P<0.05);A组股骨头下沉位移与B组差异无统计学意义(P>0.05)。扭转角度为6°时,A组扭矩与B组差异无统计学意义(P>0.05)。A组轴线最大承载明显高于B组(P<0.05)。结论:DHS-B具备可靠的防旋和抗压能力,适宜于股骨颈骨折治疗。

Objective:To compare the anti-compression and anti-rotation ability of dynamic hip screwblade(DHS-B)fixation in the treatment of femoral neck fractures.Methods:8 femoral neck fracture specimens from 4 adult cadavers were prepared and divided into 2 groups.The observation group was treated with DHS-B fixation,while the control group was treated with 3 cannulated compression screws(CCS)fixation.Axial compression test,horizontal torsion test and axial compression test were adopted to evaluate the anti-compression and anti-rotation ability of the 2 stationary schemes.Results:With 500N axial load,the axial and medial strain of the femoral head in the observation group was significantly lower than those in the control group(P<0.05),there was no significant difference between the 2 groupsin the displacement of the femoral head(P>0.05).With 6 degrees torsion angle,there was no significant difference in torque between the 2 groups(P>0.05).The maximum axis carrying capacity of the observation group was higher than that of the control group(P<0.05).Conclusion:DHS-B has reliable ability of anti-rotation and anti-compression.It is suitable for the treatment of femoral neck fracture.