硫酸钙骨内植入修复兔包容性骨缺损的力学分析

Biomechanical evaluation of repairation of cancellous bone defect with calcium sulphate

[目的]探讨硫酸钙体内植入后对骨缺损修复活动生物力学性能的影响。[方法]建立兔股骨远端包容性骨缺损模型,分别用柠檬酸化硫酸钙和Osteoset片填充修复,术后3、6、13周处死动物,进行一般观察及压凹力学实验分析。[结果]术后兔运动自如,无跛行,精神及饮食正常,切口愈合好,切口缝线自动脱落。动物处死后组织取材时未见关节腔积液及周围组织炎症反应。生物力学分析显示:术后3周时人工骨修复骨缺损区抗压缩强度、弹性模量均高于正常股骨髁水平;术后6周时缺损区抗压缩强度、弹性模量较术后3周时水平下降,但低于正常股骨髁水平;术后13周时缺损区抗压缩强度、弹性模量相较6周时水平增高,并接近于正常股骨髁水平。不同时间点人工骨修复区力学强度比较分析显示2种人工骨无显著性差异,但是都显著高于同期空白对照组。[结论]在硫酸钙降解吸收、缺损区骨修复过程中,其对包容性骨缺损具有一定的力学支撑作用。柠檬酸化硫酸钙能够发挥Osteoset片相当的作用。

[ Objeetive] To report the repairing offect of cancellous bone defect with calcium sulphate. [ Method] A defect 5mm in diameter and 12 mm in deep, which was drilled in the lateral aspect of rabbit lateral femoral condyle, was filled with CCaS （Citrated Calcium Sulphate） cylinder or Osteoset tablets respectively. Rabbits were killed 3, 6, 13 weeks after surgery. And then general oberservations and mechanical analyzing were conducted. [ Result] After surgery, rabbits had good movements, spirits and eating, good healing of incision. There was no arthroedema and inflammatory response around the joints. Mechanical analyzing reports： both anti-compressive strength and elasticity coefficient in the artificial bone repair bone defect area 3 weeks after surgery, were higher than in that of normal femur condyle ; Anti-compressive strength and elasticity coefficient in the defect area 6 weeks, which drop comparing to 3 weeks, was lower than that of normal femur condyle; Anti-compressive strength and elasticity coefficient 13 weeks, which is higher than 6 weeks, is approaching normal. Mechanics intensity of two groups in the different time had no significant difference, but was significantly higher than one of the same time blank group. [ Conclusion] To some extent, Calcium Sulphate has mechanical supportive effects on cancelloues bone defect in spite of the absorption and degradation of Calcium Sulphate. There is no significant difference between Citrated Calcium Sulphate and Osteoset tablets.