它的主要特征是包括实心体钉体，其上段为外螺纺杆及配合的固定加压螺帽；
The intramedullary nail is mainly characterized by including a solid nail body, the upper section of which is an external screw thread rod and a copulate fixedly pressure-adding screw cap;
双端螺纹松质骨加压螺钉的特点是两端螺纹具有不同的螺距，无螺帽。
Compression cancellous bone screw with both ends thread is a Variable pitch screw designed tO provide rigid 'fixation of cancellous bone fracture.
利用螺丝、螺帽及垫圈进行加压；
The pressurization is conducted by a screw, a nut and a washer.
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