A spinal fusion implant, comprising: a substantially parallelepiped main body having a predetermined length, width, and thickness; a distal retention plate rotatably secured to a distal end of said main body; said distal retention plate having a first, non-rotated position that is co-planar with said main body; said distal retention plate having a second, rotated, deployed position that is not coplanar to said main body; said main body having an operative position between adjacent vertebral bodies when in use; said length of said main body being sufficient to span a distance between opposing cortical portions of a vertebral body without extending substantially beyond the vertebral body when said main body is in said operative position; said thickness of said main body being substantially the same as a gap between opposing vertebral bodies in a spinal joint when said main body is in said operative position; said distal retention plate being in said first, non-rotated position when said main body is inserted between adjacent vertebral bodies; and said distal retention plate being in said second, rotated, deployed position after said main body is inserted between adjacent vertebral bodies, said distal retention plate when in said second, rotated, deployed position extending beyond said vertebral body when rotated into said second, rotated, deployed position therefore inhibiting retraction of said main body and therefore holding said spinal fusion implant and adjacent vertebral bodies in a stable relationship to one another when said distal retention plate is in said deployed position; said spinal fusion implant characterized in that: said spinal fusion implant further comprises a central rod having a distal end and a proximal end, said central rod being rotatably mounted to said main body, with said distal end of said central rod protruding from said distal end of said main body and said distal retention plate being mounted to said distal end of said central rod; and wherein said main body further comprises a port formed in said proximal end of said main body, said port being aligned with said central rod such that said central rod is accessible from said proximal end of said main body, such that said distal retention plate is rotatable from said proximal end of said main body via said central rod. a substantially parallelepiped main body having a predetermined length, width, and thickness; a distal retention plate rotatably secured to a distal end of said main body; said distal retention plate having a first, non-rotated position that is co-planar with said main body; said distal retention plate having a second, rotated, deployed position that is not coplanar to said main body; said main body having an operative position between adjacent vertebral bodies when in use; said length of said main body being sufficient to span a distance between opposing cortical portions of a vertebral body without extending substantially beyond the vertebral body when said main body is in said operative position; said thickness of said main body being substantially the same as a gap between opposing vertebral bodies in a spinal joint when said main body is in said operative position; said distal retention plate being in said first, non-rotated position when said main body is inserted between adjacent vertebral bodies; and said distal retention plate being in said second, rotated, deployed position after said main body is inserted between adjacent vertebral bodies, said distal retention plate when in said second, rotated, deployed position extending beyond said vertebral body when rotated into said second, rotated, deployed position therefore inhibiting retraction of said main body and therefore holding said spinal fusion implant and adjacent vertebral bodies in a stable relationship to one another when said distal retention plate is in said deployed position; said spinal fusion implant characterized in that: said spinal fusion implant further comprises a central rod having a distal end and a proximal end, said central rod being rotatably mounted to said main body, with said distal end of said central rod protruding from said distal end of said main body and said distal retention plate being mounted to said distal end of said central rod; and wherein said main body further comprises a port formed in said proximal end of said main body, said port being aligned with said central rod such that said central rod is accessible from said proximal end of said main body, such that said distal retention plate is rotatable from said proximal end of said main body via said central rod. said spinal fusion implant further comprises a central rod having a distal end and a proximal end, said central rod being rotatably mounted to said main body, with said distal end of said central rod protruding from said distal end of said main body and said distal retention plate being mounted to said distal end of said central rod; and wherein said main body further comprises a port formed in said proximal end of said main body, said port being aligned with said central rod such that said central rod is accessible from said proximal end of said main body, such that said distal retention plate is rotatable from said proximal end of said main body via said central rod.