An implantable prosthesis can have a three-dimensional shape that is invertible, so as to assume either a right configuration or a left configuration, which can be substantially mirror images of each other, so as to eliminate the need for separately manufacturing a left prosthesis and a right prosthesis. An implantable prosthesis can be preformed to independently assume a contoured three-dimensional shape that more adequately fits the extraperitoneal laparoscopic inguinal space, while simultaneously maintaining a relatively large area for fixation of the prostheses (e.g., through suturing or integration with the surrounding tissue). An implantable prosthesis can have a three-dimensional contoured shape that is formed from a single piece of continuous material, such as a mesh, and can possess substantially uniform rigidity. An implantable prosthesis may be trimmed, cut, or altered at an outer perimeter with no detrimental effect on its ability to independently maintain a predetermined three-dimensional contoured shape.
