槽式髋臼扩大术治疗儿童髋关节发育不良 AA。结果所有病例均获随访。平均随访期19个月。根据疼痛、Trendelenburg征、关节活动度、中心边缘角(center edge angle，CEA)测定及并发症行综合评价，SAA总有效率达92.9%。可见槽式髋臼扩大术(SAA)特别适用于髋关节包容
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The result shows that:(1)Micro-fibril angle increases gradually from the center to the edge in radial direction, and the surface area percentage of its fiber band has the same variability;
结果表明，微纤丝角径向自内向外略有减小，纤维股面积比径向自内向外逐渐增大；
The center-edge angle can be used as an indicator of hip instability.
CE角可被用来作为髋不稳定的指针。
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