#$%^&*AU2010236997B220151112.pdf#####- 55 ABSTRACT OF THE DISCLOSURE A joint prosthesis system has two implant components and a bearing. One of the implant components has an articulation surface for articulation with the bearing. The other implant component han a mounting surface for supporting the bearing. At 5 least one of the first and second components includes a recess and a stud in the recess. The joint prosthesis also includes an extension mounted on the stud and extending out from the bone-engaging surface to an end. Part of the extension is received in the recess. 22/lO1IOyva 129C25pc.nuS1/17 2 10 511 62 -2 343 324 - 38 66 48 2 6 6 368 726 76 a Fig. 1