Publication Date of patent: Dec 30, 1997
A tension screw of the type is primarily intended for anchoring one end of a ligament graft to a bone during surgery to repair a damaged or torn ligament. The tension screw includes two principal elements: a cannulated screw and a bone screw which is insertable through the longitudinal bore of the cannulated screw. The bone screw actually anchors the graft to a bone, while the cannulated screw includes a small hook for attaching the ligament graft thereto. The cannulated screw is free to rotate around the bone screw so as to place the ligament graft under tension. Then, the bone screw is tightened into the bone, fixing the graft to the bone.