| 摘要 |
A surgical screw (5) having a head (6) being, at least in a portion (8), hemispherical. A smooth continuous join exists between the head (6) and a shank (7) of the screw (5), the head (6) being of the same, or larger, diameter as the shank (7). To drive the screw a drive socket (11) is provided concentrically within the head, and a cannulation (9) is provided concentrically of the shank (7) and it opens into the socket (11) so as to allow the screw (5) to be threaded along a guide wire (not shown) or similar. The shank (7) has a smooth or soft thread so as to provide an interlocking fixation of a bone end of a tendon graft within a prepared hole of a bone, but without damaging either bone structures. The hemispherical portion (8) provides a smooth continuous curved surface over which a graft may flex and move without fatigue or suffering stress concentrations. |
