含锶羟基磷灰石骨水泥强化动力髋螺钉的极限载荷性能测试

The ultimate load of dynamic hip screw with strontium-containing hydroxyapatite cement augmentation

目的测试采用含锶羟基磷灰石骨水泥(Sr-HAC)强化动力髋螺钉(DHS)固定股骨粗隆间骨折后的极限载荷性能。方法 18具老年人骨质疏松股骨标本,随机分成三组,每组6例,对照组(正常标本),其中二组制成EvansⅢ型骨折模型,一组应用DHS固定,另一组应用Sr-HAC强化DHS固定,测量各组的最大载荷。结果正常标本组的极限载荷最大,Sr-HAC强化DHS内固定股骨粗隆间骨折的极限载荷次之,单纯DHS内固定组的极限载荷最小,其中Sr-HAC强化DHS组与单纯DHS内固定组相比差异有统计学意义(<0.05)。结论采用Sr-HAC DHS内固定,能提高DHS的极限载荷,可能减少内固定的失败。

Objective To investigate the ultimate load of dynamic hip screw（DHS） with（strontium-containing hydroxyapatite cement（Sr-HAC） augmentation.Methods 18 osteooporotic femoral specimens were randomly divided into three groups by the method of digits table,intact specimens group（6 case）,the other specimens were divided two group,After being made for the Evans Ⅲ type fracture model,the group fixed with DHS directly and the group with DHS by Sr-HAC augmentation.The ultimate load were tested respectively.Results The ultimate load of intact specimen is the highest while that of DHS fixation group is the lowest.But the group of DHS with Sr-HAC augmentation has more significantly ultimate load compare with the group of DHS（P0.05）.Conclusion DHS with Sr-HAC augmentation group increase the ultimate load of the DHS and decrease the rate of failure of DHS internal fixation possibly.