| 摘要 |
An anti-subsidence dynamic hip screw comprises of a barrel having a connection portion and a tube-type extending portion angled a predetermined angle with the connection portion, and a first long groove and a first limit portion disposed at the inner wall of the extending portion respectively; a lag screw having an inside end disposed threading screw at its outer edge and a outside end with a predetermined length passed through in the extending portion by the way of reciprocation; a second long groove and a second limit portion disposed at the lag screw respectively related to the first long groove and the first limit portion, each first limit portion and second limit portion used for preventing the lag screw from rotating inside the extending portion; a blade piece with a predetermined length simultaneously passed through and retained in the first long groove and the related second long groove; a compressing screw having an inside end screwed with the outside end of the lag screw and an outside end retained in the outside end of the extending portion. The above structure is not only easy to assembly, especially for the effect of decreasing the subsidence of the femoral head, but also makes the effect more obvious when using for the hip fracture of the osteoporosis body.
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