| 摘要 |
The present invention relates to a screw implant (1) for insertion into a bo re hole (50) arranged in bone tissue, said implant having a cancellous portion (3), and a cortical portion (2) having an axial length such that, when installed in the bore hole (50), the engagement of said cortical portion (2) with the bone tissue will generally be confined to the cortical bone tissue layer (52). Said cortical portion (2) presents an outer surface which is threaded for accomplishing said engagement, and has an outer design such tha t, when being screwed into said bore hole under action of a screwing torque, sa id cortical portion (2) acts so as to increase the compression of the cortical bone tissue only, in essentially radial directions of the implant, resulting is a distinct increase of the screwing torque needed for screwing the implan t (1). Said increase is usable as an indication that the implant (1) is in pla ce or nearly in place in the bore hole. The invention also relates to an arrangement comprising an implant and a bore hole, and a method for insertio n of an implant into a bore hole.
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