方法：应用中空双头加压螺纹钉加折断式螺钉治疗股骨颈骨折。
Method: Treatment of femoral neck fractures using hollow double ends compressive screws and breaking screws.
本文提出了一种新型钉式双锚头压环锚杆，同时介绍了此种锚杆的技术参数，作用机理，现场试验以及工程应用情况。
A new nail-type dual anchor-root press-ring anchor was introduced. And the technical parameters, mechanism, field tests and engineering practice were included.
三枚中空双头螺纹加压钉比三枚实心螺纹钉、三翼钉在抗压、抗弯、抗扭强度和刚度上占有一定的优势。
The 3 hollow double heads compression screw appear to offer distinct advantage over the 3 solid screw, trifin in the against pressure, against bending force, torsional strength and torsional rigidity.
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