A pseudo arthrosis device may be placed in a disc space to provide support for adjacent vertebrae. The device may have an enclosure formed from a flexible, permeable material. A core may be packed in the enclosure. The core may be compressible and/or flexible. In certain embodiments, the core may include a plurality of elongated members. In other embodiments, the core may include ridges or grooves. The enclosure may be placed in an intervertebral space between the adjacent vertebrae such that the core is disposed between the adjacent vertebrae. The pseudo arthrosis device may include a tab designed to couple the enclosure to an adjacent vertebrae.