Patent ID: 7217292

Claim:
An orthopedic spacer device for positioning between adjacent vertebral bones, the device comprising a spacer body having an external surface, including at least two relative angle designation marks, the angle designation marks being remote from one another at a predetermined spatial distance such that once the spacer body is inserted between adjacent vertebral bones and the spacer body is rotated, a rotational angle of the spacer body relative to a known reference is determinable by comparing the rotation of the angle designation marks, wherein the spacer body includes an engagement locus coupleable with a manipulation tool, wherein the engagement locus comprises a groove into which the manipulation tool is seatable, wherein the groove includes a radially widening with such that the spacer body is preventable from rotating freely with respect to the manipulation tool by clamping action thereof, thereby permitting a controlled rotation of the spacer body within a intervertebral space by manipulation of the tool.