Medical implants having desired surface features and methods of manufacturing

An implantable device, comprising:

• an elongated body portion defining a longitudinal direction, said elongated body portion comprising a first region that is substantially solid, and a second region, adjacent to said first region;
• a perimeter covering some of an outer surface of the elongated body portion along the longitudinal direction;
• and
• wherein:
• said second region further comprises a plurality of interconnected struts, said struts having an average strut length, said struts defining openings between said struts through which bone can grow, some of said struts joining said first region, others of said struts being connected at both of their ends to other struts, outermost ones of said struts defining an exterior having a bone-facing enveloping surface, wherein said bone-facing enveloping surface comprises a plurality of splines, each spline having a first dimension that is at least a plurality of said average strut length and a second dimension, generally perpendicular to said first dimension, that is at least a plurality of said average strut length,
• wherein along a perimeter located in a cross-section taken perpendicular to said longitudinal direction, said shape of said splines comprises, in an alternating manner, concave regions alternating with convex regions, and wherein said shape of said splines extends generally along said longitudinal direction.

An implantable device, comprising:

• an elongated body portion defining a longitudinal direction, said elongated body portion comprising a first region that is substantially solid, and a second region, adjacent to said first region;
• one or more macroscopic surface-interrupting features on a surface of the elongated body portion;
• and
• wherein:
• said second region comprises a plurality of interconnected struts, said struts having an average strut length, said struts defining openings between said struts through which bone can grow, some of said struts joining said first region, some others of said struts being connected at both of their ends to other struts, being outermost struts, and defining an exterior having a bone-facing enveloping surface, and
• portions of the surface of said elongated body portion nearby said one or more macroscopic surface-interrupting features comprise said interconnected struts, said macroscopic surface-interrupting features having a first dimension that is at least a plurality of said average strut length and a second dimension, generally perpendicular to said first dimension, that is at least a plurality of said average strut length,
• said one or more macroscopic surface-interrupting features are made of solid or substantially-solid material,
• wherein said one or more macroscopic surface-interrupting features protrude through a network of said struts and outwardly beyond outermost ones of said struts.