An interbody spacer (10) for insertion between vertebral members. The spacer includes a body having posterior and anterior sides (13,14) , and inferior and superior faces (17,18) . The spacer further includes a plurality of teeth (30) to maintain the position of the spacer between the vertebral members. The teeth are aligned in a pattern and have a shape to allow insertion into the space between the vertebral members, and prevent or limit movement once the spacer is positioned in the space.
