The application discloses an implant assembly (20) comprising an implant body (24) with first and second bone contacting surfaces (28,30) spaced apart and at least one of said contacting surfaces defining at least one recess (32) that extends into a first side of the implant body (24) but not through the implant body (24), and said at least one recess (32) is configured to receive a head (42) of a bone anchor (22) so that a shaft (36) of the bone anchor (22) extends out from the first side. Furthermore a method for fixation said intervertebral implant including the steps of: a) applying a spreading force to a first and second adjacent vertebral bodies (38,40)； b) removing the intervertebral disc between the adjacent first and second vertebral bodies (38,40)； c) inserting a shaft (36) of the bone anchors (22) into the vertebral bodies (38,40), and fixing a head (42) of the bone anchors (22) to an intervertebral implant (20).
