| 摘要 |
The screw consists of a cylindro-conical rod (1) which is threaded along its whole length, its cylindrical portion extending from its head for a sufficient length to fix the ligament in place against the inner wall of a bone tunnel. The screw's thread is of constant depth along the whole of its cylindrical section and decreases regularly along its tapering tip (5). In a variant of the design the screw can be made with a core which is cylindrical along the whole length of the screw. The outer edges of the threads are rounded along the screw's cylindrical portion and flattened at its tip, while the thread recesses are rounded along the whole length. In addition, the screw has a lengthwise channel (8) for a guide pin and a hexagonal recess (4) for a matching screwdriver tip.
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