A method of performing a surgical procedure and a sliding intervertebral implant includes an inner member that connects to an intervertebral space between two adjacent vertebrae, wherein the inner member includes a pair of arms spaced apart by a gap; an inclined plane configured in the gap; an arcuately-shaped back portion; and a fitting mechanism coupled below the pair of arms and the back portion, wherein the fitting mechanism includes a knob and neck. An outer member slidably attaches to the inner member, and includes a pair of curved arms spaced apart by a channel, wherein the pair of curved arms comprise an arcuate shape to match the arcuate shape of the back portion of the inner member, wherein the knob is configured to slide in the channel within a limitation of a pre-set curvature that is based on a pattern of a shape of the intervertebral space.