Joint implant part, joint endoprosthesis and method for producing a joint implant part and a joint endoprosthesis

A joint endoprosthesis comprising at least one joint implant part, the at least one joint implant part comprising:

• at least one first volume region,
• at least one second volume region, and
• at least one third volume region,
• the at least one first volume region defining a bone contact surface region with at least one bone contact surface, the at least one second volume region defining a joint surface region with at least one joint surface, and the at least one third volume region does not contact a bone surface or a joint surface in an implanted position,
• wherein:
• a modulus of elasticity of at least one of the at least one first, second, and third volume regions varies in at least one spatial direction,
• the at least one first, second and third volume regions each comprises a plurality of cavities,
• a total volume defined by the plurality of cavities in an entirety of the at least one third volume region is greater than a total volume defined by the plurality of cavities in an entirety of the at least one first volume region and greater than a total volume defined by the plurality of cavities in an entirety of the at least one second volume region,
• compared total volumes of the at least one first volume region, the at least one second volume region and the at least one third volume region are identical in size, and
• an average total volume defined by the plurality of cavities in the at least one first volume region increases starting from the at least one bone contact surface in a direction towards the at least one third volume region, an average total volume defined by the plurality of cavities in the at least one third volume region has a maximum in the at least one third volume region, and an average total volume defined by the plurality of cavities in the at least one second volume region decreases in a direction towards the at least one joint surface.

A joint implant part of a joint endoprosthesis, comprising:

• at least one first volume region,
• at least one second volume region, and
• at least one third volume region,
• the at least one first volume region defining a bone contact surface region with at least one bone contact surface, the at least one second volume region defining a joint surface region with at least one joint surface, and the at least one third volume region does not contact a bone surface or a joint surface in an implanted position,
• wherein:
• a modulus of elasticity of at least one of the at least one first, second, and third volume regions varies in at least one spatial direction,
• the at least one first, second, and third volume region each comprises a plurality of cavities,
• a total volume defined by the plurality of cavities in an entirety of the at least one third volume region is greater than a total volume defined by the plurality of cavities in an entirety of the at least one first volume region and greater than a total volume defined by the plurality of cavities in an entirety of the at least one second volume region;
• compared total volumes of the at least one first volume region, the at least one second volume region and the at least one third volume region are identical in size, and
• the at least one first volume region, the at least one second volume region, and the at least one third volume region each respectively extend over approximately 1/3 of a thickness of the implant part, the thickness being defined by a distance between the at least one bone contact surface and the at least one joint surface.