An apparatus (100) for facilitating the mounting of a prosthetic articulation surface (548) to a patient tissue includes an anchoring base (102) including a central fastener aperture (106) extending longitudinally therethrough. A first base end (108) is laterally spaced from the central fastener aperture. A second base end (110) is laterally spaced from the first base end with the central fastener aperture laterally interposed therebetween. Both of the first and second base ends include a plate engagement feature (114). An anchor plate (122) includes a central coupler aperture (124) extending longitudinally therethrough. An outer perimeter (126) is spaced laterally apart from the central coupler aperture. A plate rim (128) extends laterally inward from the outer perimeter to substantially laterally surround the central coupler aperture. At least one plate fastener aperture (130) extends longitudinally through the plate rim. At least one base engagement feature (432) is located on the plate rim and is selectively engageable with the plate engagement feature of the anchoring base.
