| 摘要 |
An instrument for use in orthopaedic surgery for location of a reference point relative to a bone surface comprises a plate member (30) having at least two holes (36, 38) in it towards one end for receiving fasteners which can pass through the holes into the bone to fasten the plate member to the bone. A pivot rocker (40) is provided between the said holes, which protrudes from the face of the plate member which faces the bone surface when the plate member is positioned against a bone, and a reference point (44) is provided towards the opposite end of the plate member form the fastening holes which is spaced from the fastening holes in a direction parallel to the line which intersects the holes. The distance between the reference point on the plate member and the surface of the bone can be adjusted by moving the fastener in one of the fastening holes into the bone and moving the fastener in the other of the fastening holes out of the bone.
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