A posterior, non-pedicle supplemental fixation device intended for single level use in the non-cervical spine (T1-S1). It is intended for single level plate fixation/attachment to spinous process for the purpose of achieving supplemental fusion in the following conditions: Degenerative Disc Disease (defined as back pain of discogenic origin with degeneration of the disc confirmed by history and radiographic studies), Trauma (i.e., fracture or dislocation), Spondylolisthesis, and/or Tumor. It is not intended for stand-alone use.