新型点式接触动力加压接骨板固定对板下骨质及力学性能影响的实验研究

目的　探讨新型点式接触动力加压接骨板固定对板下骨质及力学性能的影响。方法　采用性成熟山羊 6只 ,双侧完整胫骨分别采用点式接触动力加压接骨板 (pointcontact dynamiccompressionplate,PC DCP)和动力加压钢板 (dynamiccompressionplate,DCP)固定。固定后 1 2周和 2 4周分批处死动物 ,每批 3只 ,取下双侧胫骨先后进行CT扫描 ,测量局部皮质骨厚度和抗扭力学性能测试。结果　固定后 1 2周 ,PC DCP组板下皮质骨厚度和骨抗扭力学强度均明显大于DCP组 (P <0 .0 5 )。固定后 2 4周 ,DCP组和PC DCP组骨皮质均变薄 ,骨髓腔扩大 ,两组间骨皮质厚度和抗扭力学性能间差异无显著性意义 (P >0 .0 5 )。结论　点式接触动力加压接骨板可避免固定后较早期局部骨质疏松的发生 ,但在后期具有与传统接骨板相似的应力遮挡作用

Effects of point contact-dynamic compression plate on the structure and mechanical property of the fixed bone

Objective To study the effects of point contact dynamic compression plate (PC DCP) on the regional structure and mechanical property of the plated bone.?Methods Both PC DCP and dynamic compression plate (DCP) were fixed on the middle part of intact tibia of goats.?The bone structure and mechanical property of the fixed bone were observed and studied by CT scan and torsional test.?Results The thickness of cortical bone under plate and mechanical property of the fixed bone in PC DCP group were significantly higher than in DCP group after 12 weeks fixation(P< 0.05) .?The thickness of cortical bone became thinner in both groups after 24 weeks fixation.?There were no significant difference in both cortical thickness and torsional property between DCP and PC DCP groups after 24 weeks fixation (P>0.05).?Conclusion PC DCP can prevent osteoporosis of the fixed bone in the early time after fixation.?In the later time,PC DCP can induce osteoporosis the same as conventional plate.