An orthopedic prosthetic impactor 10 used for the implantation of double mobility cup implants is described. In one embodiment, the impactor consists of a drive train, a C-shaped housing 16, and a prosthetic cup engaging subassembly 20. The subassembly comprises an impaction plate, a primary cup contacting member 26, a secondary cup contacting member 28 and a wedging assembly 33. The primary and secondary cup contacting members are contactable with an interior surface of the prosthetic cup implant 12. When activated by the drive train, the wedging assembly moves in a proximal direction towards the impaction plate, positioning the wedging assembly in a contactable relationship with the primary and secondary members thereby preventing the members and a connected prosthetic implant cup from moving during implantation.
