An implant to be inserted in a disc space between two adjacent vertebrae for the correction of vertebral spine curvature and method related thereto. A lateral configuration of the invention is a wedge or acute-angled isosceles triangle, wherein the base of the isosceles triangle is a rounded pyramid-like surface, and upper and lower surfaces of the isosceles triangle include fixation protuberances for fixing the implant to vertebral plates of the adjacent vertebrae.