Ceramic multi-hooded enarthrodial joint implant

An enarthrodial joint implant comprising a ceramic multi-hooded articular cup and an insert having a ceramic head with an articulation surface therefor, wherein:

• the cup includes a head-receiving cup made of ceramic, which is adapted and configured to be fixed when implanted into a patient such that the cup is fixed with respect to the patient directly or with respect to a backing shell in which the cup resides when the backing shell is present and fixed directly to the patient, which has an articular surface upon which the articulation surface of the head can articulate, and which has a margin generally about a hemisphere and two and only two generally opposing hoods that are marginally extended continuations of superior about one-half of cup containment of a sufficient magnitude to reduce an overall dimension of socket outlet to less than a hemisphere, which can embrace and contain the head when the head is inserted into the cup;
• the insert includes a joint head made of ceramic, which has a head body configured generally in a shape of a truncated sphere;
• a generally spherical articulation surface on the head body;
• and a truncation to the head body forming a truncated surface in which resides a blind hole for receipt of a trunnion of a stem, wherein:
• the truncated surface is at a central truncation distance extending from a peak of the spherical articulation surface to a center of the truncated surface, wherein the central truncation distance is perpendicular to the truncated surface;
• and
• the head can be inserted into and retained by the ceramic multi-headed articular cup when the head is inserted into the cup;
• and
• there is no securing member present for resistance against any likelihood of cracking, fracture, or other failure of the ceramic by application of outwardy displacing force on the hoods.