Ceramic multi-hooded enarthrodial joint implant

A ceramic insert for an enarthrodial joint implant having a ceramic multi-hooded articular cup, which comprises 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 frustoconical hole for receipt of a trunnion of a stem, wherein:
• the truncated surface is at a central truncation distance perpendicular to the truncated surface or an extrapolation thereof, which is greater than the radius of the head;
• and
• the head can be inserted into and retained by the ceramic multi-headed articular cup, wherein the cup is a head-receiving cup made of ceramic, which has an articular surface upon which the articulation surface of the head can articulate, and which, in general, has a margin generally about a hemisphere more or less and at least two hoods that are marginally extended continuations of superior one-half or so 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 it is inserted into the cup.

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 has an articular surface upon which the articulation surface of the head can articulate, and which, in general, has a margin generally about a hemisphere more or less and at least two hoods that are marginally extended continuations of superior one-half or so 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 it 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 perpendicular to the truncated surface or an extrapolation thereof, which is greater than the radius of the head;
• and
• the head can be inserted into and retained by the ceramic multi-headed articular cup when the head is inserted into the cup.